analytics/webcontent/bi/lib/mobx-state-tree/3.15.0/mobx-state-tree.module.js

import { isComputedProp, isObservableProp, createAtom, action, _allowStateChangesInsideComputed, reaction, computed, runInAction, observable, values, entries, isObservableArray, getAtom, $mobx, ObservableMap, _interceptReads, intercept, observe, _getAdministration, set } from 'mobx';

var livelinessChecking = "warn";
/**
 * Defines what MST should do when running into reads / writes to objects that have died.
 * By default it will print a warning.
 * Use the `"error"` option to easy debugging to see where the error was thrown and when the offending read / write took place
 *
 * @param mode `"warn"`, `"error"` or `"ignore"`
 */
function setLivelinessChecking(mode) {
    livelinessChecking = mode;
}
/**
 * Returns the current liveliness checking mode.
 *
 * @returns `"warn"`, `"error"` or `"ignore"`
 */
function getLivelinessChecking() {
    return livelinessChecking;
}
/**
 * @deprecated use setLivelinessChecking instead
 * @hidden
 *
 * Defines what MST should do when running into reads / writes to objects that have died.
 * By default it will print a warning.
 * Use the `"error"` option to easy debugging to see where the error was thrown and when the offending read / write took place
 *
 * @param mode `"warn"`, `"error"` or `"ignore"`
 */
function setLivelynessChecking(mode) {
    setLivelinessChecking(mode);
}

/**
 * @hidden
 */
var Hook;
(function (Hook) {
    Hook["afterCreate"] = "afterCreate";
    Hook["afterAttach"] = "afterAttach";
    Hook["afterCreationFinalization"] = "afterCreationFinalization";
    Hook["beforeDetach"] = "beforeDetach";
    Hook["beforeDestroy"] = "beforeDestroy";
})(Hook || (Hook = {}));

/*! *****************************************************************************
Copyright (c) Microsoft Corporation. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at http://www.apache.org/licenses/LICENSE-2.0

THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
MERCHANTABLITY OR NON-INFRINGEMENT.

See the Apache Version 2.0 License for specific language governing permissions
and limitations under the License.
***************************************************************************** */
/* global Reflect, Promise */

var extendStatics = function(d, b) {
    extendStatics = Object.setPrototypeOf ||
        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
    return extendStatics(d, b);
};

function __extends(d, b) {
    extendStatics(d, b);
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
}

var __assign = function() {
    __assign = Object.assign || function __assign(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};

function __rest(s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
        t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function")
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            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
                t[p[i]] = s[p[i]];
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    return t;
}

function __decorate(decorators, target, key, desc) {
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    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
}

function __values(o) {
    var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
    if (m) return m.call(o);
    return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
}

function __read(o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
}

function __spread() {
    for (var ar = [], i = 0; i < arguments.length; i++)
        ar = ar.concat(__read(arguments[i]));
    return ar;
}

/**
 * Returns the _actual_ type of the given tree node. (Or throws)
 *
 * @param object
 * @returns
 */
function getType(object) {
    assertIsStateTreeNode(object, 1);
    return getStateTreeNode(object).type;
}
/**
 * Returns the _declared_ type of the given sub property of an object, array or map.
 * In the case of arrays and maps the property name is optional and will be ignored.
 *
 * Example:
 * ```ts
 * const Box = types.model({ x: 0, y: 0 })
 * const box = Box.create()
 *
 * console.log(getChildType(box, "x").name) // 'number'
 * ```
 *
 * @param object
 * @param propertyName
 * @returns
 */
function getChildType(object, propertyName) {
    assertIsStateTreeNode(object, 1);
    return getStateTreeNode(object).getChildType(propertyName);
}
/**
 * Registers a function that will be invoked for each mutation that is applied to the provided model instance, or to any of its children.
 * See [patches](https://github.com/mobxjs/mobx-state-tree#patches) for more details. onPatch events are emitted immediately and will not await the end of a transaction.
 * Patches can be used to deep observe a model tree.
 *
 * @param target the model instance from which to receive patches
 * @param callback the callback that is invoked for each patch. The reversePatch is a patch that would actually undo the emitted patch
 * @returns function to remove the listener
 */
function onPatch(target, callback) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsFunction(callback, 2);
    return getStateTreeNode(target).onPatch(callback);
}
/**
 * Registers a function that is invoked whenever a new snapshot for the given model instance is available.
 * The listener will only be fire at the end of the current MobX (trans)action.
 * See [snapshots](https://github.com/mobxjs/mobx-state-tree#snapshots) for more details.
 *
 * @param target
 * @param callback
 * @returns
 */
function onSnapshot(target, callback) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsFunction(callback, 2);
    return getStateTreeNode(target).onSnapshot(callback);
}
/**
 * Applies a JSON-patch to the given model instance or bails out if the patch couldn't be applied
 * See [patches](https://github.com/mobxjs/mobx-state-tree#patches) for more details.
 *
 * Can apply a single past, or an array of patches.
 *
 * @param target
 * @param patch
 * @returns
 */
function applyPatch(target, patch) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertArg(patch, function (p) { return typeof p === "object"; }, "object or array", 2);
    getStateTreeNode(target).applyPatches(asArray(patch));
}
/**
 * Small abstraction around `onPatch` and `applyPatch`, attaches a patch listener to a tree and records all the patches.
 * Returns an recorder object with the following signature:
 *
 * Example:
 * ```ts
 * export interface IPatchRecorder {
 *      // the recorded patches
 *      patches: IJsonPatch[]
 *      // the inverse of the recorded patches
 *      inversePatches: IJsonPatch[]
 *      // true if currently recording
 *      recording: boolean
 *      // stop recording patches
 *      stop(): void
 *      // resume recording patches
 *      resume(): void
 *      // apply all the recorded patches on the given target (the original subject if omitted)
 *      replay(target?: IAnyStateTreeNode): void
 *      // reverse apply the recorded patches on the given target  (the original subject if omitted)
 *      // stops the recorder if not already stopped
 *      undo(): void
 * }
 * ```
 *
 * The optional filter function allows to skip recording certain patches.
 *
 * @param subject
 * @param filter
 * @returns
 */
function recordPatches(subject, filter) {
    // check all arguments
    assertIsStateTreeNode(subject, 1);
    var data = {
        patches: [],
        reversedInversePatches: []
    };
    // we will generate the immutable copy of patches on demand for public consumption
    var publicData = {};
    var disposer;
    var recorder = {
        get recording() {
            return !!disposer;
        },
        get patches() {
            if (!publicData.patches) {
                publicData.patches = data.patches.slice();
            }
            return publicData.patches;
        },
        get reversedInversePatches() {
            if (!publicData.reversedInversePatches) {
                publicData.reversedInversePatches = data.reversedInversePatches.slice();
            }
            return publicData.reversedInversePatches;
        },
        get inversePatches() {
            if (!publicData.inversePatches) {
                publicData.inversePatches = data.reversedInversePatches.slice().reverse();
            }
            return publicData.inversePatches;
        },
        stop: function () {
            if (disposer) {
                disposer();
                disposer = undefined;
            }
        },
        resume: function () {
            if (disposer)
                return;
            disposer = onPatch(subject, function (patch, inversePatch) {
                // skip patches that are asked to be filtered if there's a filter in place
                if (filter && !filter(patch, inversePatch, getRunningActionContext())) {
                    return;
                }
                data.patches.push(patch);
                data.reversedInversePatches.unshift(inversePatch);
                // mark immutable public patches as dirty
                publicData.patches = undefined;
                publicData.inversePatches = undefined;
                publicData.reversedInversePatches = undefined;
            });
        },
        replay: function (target) {
            applyPatch(target || subject, data.patches);
        },
        undo: function (target) {
            applyPatch(target || subject, data.reversedInversePatches);
        }
    };
    recorder.resume();
    return recorder;
}
/**
 * The inverse of `unprotect`.
 *
 * @param target
 */
function protect(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    var node = getStateTreeNode(target);
    if (!node.isRoot)
        throw fail$1("`protect` can only be invoked on root nodes");
    node.isProtectionEnabled = true;
}
/**
 * By default it is not allowed to directly modify a model. Models can only be modified through actions.
 * However, in some cases you don't care about the advantages (like replayability, traceability, etc) this yields.
 * For example because you are building a PoC or don't have any middleware attached to your tree.
 *
 * In that case you can disable this protection by calling `unprotect` on the root of your tree.
 *
 * Example:
 * ```ts
 * const Todo = types.model({
 *     done: false
 * }).actions(self => ({
 *     toggle() {
 *         self.done = !self.done
 *     }
 * }))
 *
 * const todo = Todo.create()
 * todo.done = true // throws!
 * todo.toggle() // OK
 * unprotect(todo)
 * todo.done = false // OK
 * ```
 */
function unprotect(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    var node = getStateTreeNode(target);
    if (!node.isRoot)
        throw fail$1("`unprotect` can only be invoked on root nodes");
    node.isProtectionEnabled = false;
}
/**
 * Returns true if the object is in protected mode, @see protect
 */
function isProtected(target) {
    return getStateTreeNode(target).isProtected;
}
/**
 * Applies a snapshot to a given model instances. Patch and snapshot listeners will be invoked as usual.
 *
 * @param target
 * @param snapshot
 * @returns
 */
function applySnapshot(target, snapshot) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    return getStateTreeNode(target).applySnapshot(snapshot);
}
/**
 * Calculates a snapshot from the given model instance. The snapshot will always reflect the latest state but use
 * structural sharing where possible. Doesn't require MobX transactions to be completed.
 *
 * @param target
 * @param applyPostProcess If true (the default) then postProcessSnapshot gets applied.
 * @returns
 */
function getSnapshot(target, applyPostProcess) {
    if (applyPostProcess === void 0) { applyPostProcess = true; }
    // check all arguments
    assertIsStateTreeNode(target, 1);
    var node = getStateTreeNode(target);
    if (applyPostProcess)
        return node.snapshot;
    return freeze(node.type.getSnapshot(node, false));
}
/**
 * Given a model instance, returns `true` if the object has a parent, that is, is part of another object, map or array.
 *
 * @param target
 * @param depth How far should we look upward? 1 by default.
 * @returns
 */
function hasParent(target, depth) {
    if (depth === void 0) { depth = 1; }
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsNumber(depth, 2, 0);
    var parent = getStateTreeNode(target).parent;
    while (parent) {
        if (--depth === 0)
            return true;
        parent = parent.parent;
    }
    return false;
}
/**
 * Returns the immediate parent of this object, or throws.
 *
 * Note that the immediate parent can be either an object, map or array, and
 * doesn't necessarily refer to the parent model.
 *
 * Please note that in child nodes access to the root is only possible
 * once the `afterAttach` hook has fired.
 *
 * @param target
 * @param depth How far should we look upward? 1 by default.
 * @returns
 */
function getParent(target, depth) {
    if (depth === void 0) { depth = 1; }
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsNumber(depth, 2, 0);
    var d = depth;
    var parent = getStateTreeNode(target).parent;
    while (parent) {
        if (--d === 0)
            return parent.storedValue;
        parent = parent.parent;
    }
    throw fail$1("Failed to find the parent of " + getStateTreeNode(target) + " at depth " + depth);
}
/**
 * Given a model instance, returns `true` if the object has a parent of given type, that is, is part of another object, map or array
 *
 * @param target
 * @param type
 * @returns
 */
function hasParentOfType(target, type) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsType(type, 2);
    var parent = getStateTreeNode(target).parent;
    while (parent) {
        if (type.is(parent.storedValue))
            return true;
        parent = parent.parent;
    }
    return false;
}
/**
 * Returns the target's parent of a given type, or throws.
 *
 * @param target
 * @param type
 * @returns
 */
function getParentOfType(target, type) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsType(type, 2);
    var parent = getStateTreeNode(target).parent;
    while (parent) {
        if (type.is(parent.storedValue))
            return parent.storedValue;
        parent = parent.parent;
    }
    throw fail$1("Failed to find the parent of " + getStateTreeNode(target) + " of a given type");
}
/**
 * Given an object in a model tree, returns the root object of that tree.
 *
 * Please note that in child nodes access to the root is only possible
 * once the `afterAttach` hook has fired.
 *
 * @param target
 * @returns
 */
function getRoot(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    return getStateTreeNode(target).root.storedValue;
}
/**
 * Returns the path of the given object in the model tree
 *
 * @param target
 * @returns
 */
function getPath(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    return getStateTreeNode(target).path;
}
/**
 * Returns the path of the given object as unescaped string array.
 *
 * @param target
 * @returns
 */
function getPathParts(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    return splitJsonPath(getStateTreeNode(target).path);
}
/**
 * Returns true if the given object is the root of a model tree.
 *
 * @param target
 * @returns
 */
function isRoot(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    return getStateTreeNode(target).isRoot;
}
/**
 * Resolves a path relatively to a given object.
 * Returns undefined if no value can be found.
 *
 * @param target
 * @param path escaped json path
 * @returns
 */
function resolvePath(target, path) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsString(path, 2);
    var node = resolveNodeByPath(getStateTreeNode(target), path);
    return node ? node.value : undefined;
}
/**
 * Resolves a model instance given a root target, the type and the identifier you are searching for.
 * Returns undefined if no value can be found.
 *
 * @param type
 * @param target
 * @param identifier
 * @returns
 */
function resolveIdentifier(type, target, identifier) {
    // check all arguments
    assertIsType(type, 1);
    assertIsStateTreeNode(target, 2);
    assertIsValidIdentifier(identifier, 3);
    var node = getStateTreeNode(target).root.identifierCache.resolve(type, normalizeIdentifier(identifier));
    return node ? node.value : undefined;
}
/**
 * Returns the identifier of the target node.
 * This is the *string normalized* identifier, which might not match the type of the identifier attribute
 *
 * @param target
 * @returns
 */
function getIdentifier(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    return getStateTreeNode(target).identifier;
}
/**
 * Tests if a reference is valid (pointing to an existing node and optionally if alive) and returns such reference if it the check passes,
 * else it returns undefined.
 *
 * @param getter Function to access the reference.
 * @param checkIfAlive true to also make sure the referenced node is alive (default), false to skip this check.
 * @returns
 */
function tryReference(getter, checkIfAlive) {
    if (checkIfAlive === void 0) { checkIfAlive = true; }
    try {
        var node = getter();
        if (node === undefined || node === null) {
            return undefined;
        }
        else if (isStateTreeNode(node)) {
            if (!checkIfAlive) {
                return node;
            }
            else {
                return isAlive(node) ? node : undefined;
            }
        }
        else {
            throw fail$1("The reference to be checked is not one of node, null or undefined");
        }
    }
    catch (e) {
        if (e instanceof InvalidReferenceError) {
            return undefined;
        }
        throw e;
    }
}
/**
 * Tests if a reference is valid (pointing to an existing node and optionally if alive) and returns if the check passes or not.
 *
 * @param getter Function to access the reference.
 * @param checkIfAlive true to also make sure the referenced node is alive (default), false to skip this check.
 * @returns
 */
function isValidReference(getter, checkIfAlive) {
    if (checkIfAlive === void 0) { checkIfAlive = true; }
    try {
        var node = getter();
        if (node === undefined || node === null) {
            return false;
        }
        else if (isStateTreeNode(node)) {
            return checkIfAlive ? isAlive(node) : true;
        }
        else {
            throw fail$1("The reference to be checked is not one of node, null or undefined");
        }
    }
    catch (e) {
        if (e instanceof InvalidReferenceError) {
            return false;
        }
        throw e;
    }
}
/**
 * Try to resolve a given path relative to a given node.
 *
 * @param target
 * @param path
 * @returns
 */
function tryResolve(target, path) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsString(path, 2);
    var node = resolveNodeByPath(getStateTreeNode(target), path, false);
    if (node === undefined)
        return undefined;
    try {
        return node.value;
    }
    catch (e) {
        // For what ever reason not resolvable (e.g. totally not existing path, or value that cannot be fetched)
        // see test / issue: 'try resolve doesn't work #686'
        return undefined;
    }
}
/**
 * Given two state tree nodes that are part of the same tree,
 * returns the shortest jsonpath needed to navigate from the one to the other
 *
 * @param base
 * @param target
 * @returns
 */
function getRelativePath(base, target) {
    // check all arguments
    assertIsStateTreeNode(base, 1);
    assertIsStateTreeNode(target, 2);
    return getRelativePathBetweenNodes(getStateTreeNode(base), getStateTreeNode(target));
}
/**
 * Returns a deep copy of the given state tree node as new tree.
 * Short hand for `snapshot(x) = getType(x).create(getSnapshot(x))`
 *
 * _Tip: clone will create a literal copy, including the same identifiers. To modify identifiers etc during cloning, don't use clone but take a snapshot of the tree, modify it, and create new instance_
 *
 * @param source
 * @param keepEnvironment indicates whether the clone should inherit the same environment (`true`, the default), or not have an environment (`false`). If an object is passed in as second argument, that will act as the environment for the cloned tree.
 * @returns
 */
function clone(source, keepEnvironment) {
    if (keepEnvironment === void 0) { keepEnvironment = true; }
    // check all arguments
    assertIsStateTreeNode(source, 1);
    var node = getStateTreeNode(source);
    return node.type.create(node.snapshot, keepEnvironment === true
        ? node.root.environment
        : keepEnvironment === false
            ? undefined
            : keepEnvironment); // it's an object or something else
}
/**
 * Removes a model element from the state tree, and let it live on as a new state tree
 */
function detach(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    getStateTreeNode(target).detach();
    return target;
}
/**
 * Removes a model element from the state tree, and mark it as end-of-life; the element should not be used anymore
 */
function destroy(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    var node = getStateTreeNode(target);
    if (node.isRoot)
        node.die();
    else
        node.parent.removeChild(node.subpath);
}
/**
 * Returns true if the given state tree node is not killed yet.
 * This means that the node is still a part of a tree, and that `destroy`
 * has not been called. If a node is not alive anymore, the only thing one can do with it
 * is requesting it's last path and snapshot
 *
 * @param target
 * @returns
 */
function isAlive(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    return getStateTreeNode(target).observableIsAlive;
}
/**
 * Use this utility to register a function that should be called whenever the
 * targeted state tree node is destroyed. This is a useful alternative to managing
 * cleanup methods yourself using the `beforeDestroy` hook.
 *
 * This methods returns the same disposer that was passed as argument.
 *
 * Example:
 * ```ts
 * const Todo = types.model({
 *   title: types.string
 * }).actions(self => ({
 *   afterCreate() {
 *     const autoSaveDisposer = reaction(
 *       () => getSnapshot(self),
 *       snapshot => sendSnapshotToServerSomehow(snapshot)
 *     )
 *     // stop sending updates to server if this
 *     // instance is destroyed
 *     addDisposer(self, autoSaveDisposer)
 *   }
 * }))
 * ```
 *
 * @param target
 * @param disposer
 * @returns The same disposer that was passed as argument
 */
function addDisposer(target, disposer) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsFunction(disposer, 2);
    var node = getStateTreeNode(target);
    node.addDisposer(disposer);
    return disposer;
}
/**
 * Returns the environment of the current state tree. For more info on environments,
 * see [Dependency injection](https://github.com/mobxjs/mobx-state-tree#dependency-injection)
 *
 * Please note that in child nodes access to the root is only possible
 * once the `afterAttach` hook has fired
 *
 * Returns an empty environment if the tree wasn't initialized with an environment
 *
 * @param target
 * @returns
 */
function getEnv(target) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    var node = getStateTreeNode(target);
    var env = node.root.environment;
    if (!env)
        return EMPTY_OBJECT;
    return env;
}
/**
 * Performs a depth first walk through a tree.
 */
function walk(target, processor) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertIsFunction(processor, 2);
    var node = getStateTreeNode(target);
    // tslint:disable-next-line:no_unused-variable
    node.getChildren().forEach(function (child) {
        if (isStateTreeNode(child.storedValue))
            walk(child.storedValue, processor);
    });
    processor(node.storedValue);
}
/**
 * Returns a reflection of the model type properties and name for either a model type or model node.
 *
 * @param typeOrNode
 * @returns
 */
function getPropertyMembers(typeOrNode) {
    var type;
    if (isStateTreeNode(typeOrNode)) {
        type = getType(typeOrNode);
    }
    else {
        type = typeOrNode;
    }
    assertArg(type, function (t) { return isModelType(t); }, "model type or model instance", 1);
    return {
        name: type.name,
        properties: __assign({}, type.properties)
    };
}
/**
 * Returns a reflection of the model node, including name, properties, views, volatile and actions.
 *
 * @param target
 * @returns
 */
function getMembers(target) {
    var type = getStateTreeNode(target).type;
    var reflected = __assign(__assign({}, getPropertyMembers(type)), { actions: [], volatile: [], views: [] });
    var props = Object.getOwnPropertyNames(target);
    props.forEach(function (key) {
        if (key in reflected.properties)
            return;
        var descriptor = Object.getOwnPropertyDescriptor(target, key);
        if (descriptor.get) {
            if (isComputedProp(target, key))
                reflected.views.push(key);
            else
                reflected.volatile.push(key);
            return;
        }
        if (descriptor.value._isMSTAction === true)
            reflected.actions.push(key);
        else if (isObservableProp(target, key))
            reflected.volatile.push(key);
        else
            reflected.views.push(key);
    });
    return reflected;
}
/**
 * Casts a node snapshot or instance type to an instance type so it can be assigned to a type instance.
 * Note that this is just a cast for the type system, this is, it won't actually convert a snapshot to an instance,
 * but just fool typescript into thinking so.
 * Either way, casting when outside an assignation operation won't compile.
 *
 * Example:
 * ```ts
 * const ModelA = types.model({
 *   n: types.number
 * }).actions(self => ({
 *   setN(aNumber: number) {
 *     self.n = aNumber
 *   }
 * }))
 *
 * const ModelB = types.model({
 *   innerModel: ModelA
 * }).actions(self => ({
 *   someAction() {
 *     // this will allow the compiler to assign a snapshot to the property
 *     self.innerModel = cast({ a: 5 })
 *   }
 * }))
 * ```
 *
 * @param snapshotOrInstance Snapshot or instance
 * @returns The same object casted as an instance
 */
function cast(snapshotOrInstance) {
    return snapshotOrInstance;
}
/**
 * Casts a node instance type to an snapshot type so it can be assigned to a type snapshot (e.g. to be used inside a create call).
 * Note that this is just a cast for the type system, this is, it won't actually convert an instance to a snapshot,
 * but just fool typescript into thinking so.
 *
 * Example:
 * ```ts
 * const ModelA = types.model({
 *   n: types.number
 * }).actions(self => ({
 *   setN(aNumber: number) {
 *     self.n = aNumber
 *   }
 * }))
 *
 * const ModelB = types.model({
 *   innerModel: ModelA
 * })
 *
 * const a = ModelA.create({ n: 5 });
 * // this will allow the compiler to use a model as if it were a snapshot
 * const b = ModelB.create({ innerModel: castToSnapshot(a)})
 * ```
 *
 * @param snapshotOrInstance Snapshot or instance
 * @returns The same object casted as an input (creation) snapshot
 */
function castToSnapshot(snapshotOrInstance) {
    return snapshotOrInstance;
}
/**
 * Casts a node instance type to a reference snapshot type so it can be assigned to a refernence snapshot (e.g. to be used inside a create call).
 * Note that this is just a cast for the type system, this is, it won't actually convert an instance to a refererence snapshot,
 * but just fool typescript into thinking so.
 *
 * Example:
 * ```ts
 * const ModelA = types.model({
 *   id: types.identifier,
 *   n: types.number
 * }).actions(self => ({
 *   setN(aNumber: number) {
 *     self.n = aNumber
 *   }
 * }))
 *
 * const ModelB = types.model({
 *   refA: types.reference(ModelA)
 * })
 *
 * const a = ModelA.create({ id: 'someId', n: 5 });
 * // this will allow the compiler to use a model as if it were a reference snapshot
 * const b = ModelB.create({ refA: castToReference(a)})
 * ```
 *
 * @param instance Instance
 * @returns The same object casted as an reference snapshot (string or number)
 */
function castToReferenceSnapshot(instance) {
    return instance;
}
/**
 * Returns the unique node id (not to be confused with the instance identifier) for a
 * given instance.
 * This id is a number that is unique for each instance.
 *
 * @export
 * @param target
 * @returns
 */
function getNodeId(target) {
    assertIsStateTreeNode(target, 1);
    return getStateTreeNode(target).nodeId;
}

/**
 * @internal
 * @hidden
 */
var BaseNode = /** @class */ (function () {
    function BaseNode(type, parent, subpath, environment) {
        this.type = type;
        this.environment = environment;
        this._state = NodeLifeCycle.INITIALIZING;
        this.environment = environment;
        this.baseSetParent(parent, subpath);
    }
    Object.defineProperty(BaseNode.prototype, "subpath", {
        get: function () {
            return this._subpath;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseNode.prototype, "subpathUponDeath", {
        get: function () {
            return this._subpathUponDeath;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseNode.prototype, "pathUponDeath", {
        get: function () {
            return this._pathUponDeath;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseNode.prototype, "value", {
        get: function () {
            return this.type.getValue(this);
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseNode.prototype, "state", {
        get: function () {
            return this._state;
        },
        set: function (val) {
            var wasAlive = this.isAlive;
            this._state = val;
            var isAlive = this.isAlive;
            if (this.aliveAtom && wasAlive !== isAlive) {
                this.aliveAtom.reportChanged();
            }
        },
        enumerable: true,
        configurable: true
    });
    BaseNode.prototype.fireInternalHook = function (name) {
        if (this._hookSubscribers) {
            this._hookSubscribers.emit(name, this, name);
        }
    };
    BaseNode.prototype.registerHook = function (hook, hookHandler) {
        if (!this._hookSubscribers) {
            this._hookSubscribers = new EventHandlers();
        }
        return this._hookSubscribers.register(hook, hookHandler);
    };
    Object.defineProperty(BaseNode.prototype, "parent", {
        get: function () {
            return this._parent;
        },
        enumerable: true,
        configurable: true
    });
    BaseNode.prototype.baseSetParent = function (parent, subpath) {
        this._parent = parent;
        this._subpath = subpath;
        this._escapedSubpath = undefined; // regenerate when needed
        if (this.pathAtom) {
            this.pathAtom.reportChanged();
        }
    };
    Object.defineProperty(BaseNode.prototype, "path", {
        /*
         * Returns (escaped) path representation as string
         */
        get: function () {
            return this.getEscapedPath(true);
        },
        enumerable: true,
        configurable: true
    });
    BaseNode.prototype.getEscapedPath = function (reportObserved) {
        if (reportObserved) {
            if (!this.pathAtom) {
                this.pathAtom = createAtom("path");
            }
            this.pathAtom.reportObserved();
        }
        if (!this.parent)
            return "";
        // regenerate escaped subpath if needed
        if (this._escapedSubpath === undefined) {
            this._escapedSubpath = !this._subpath ? "" : escapeJsonPath(this._subpath);
        }
        return this.parent.getEscapedPath(reportObserved) + "/" + this._escapedSubpath;
    };
    Object.defineProperty(BaseNode.prototype, "isRoot", {
        get: function () {
            return this.parent === null;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseNode.prototype, "isAlive", {
        get: function () {
            return this.state !== NodeLifeCycle.DEAD;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseNode.prototype, "isDetaching", {
        get: function () {
            return this.state === NodeLifeCycle.DETACHING;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseNode.prototype, "observableIsAlive", {
        get: function () {
            if (!this.aliveAtom) {
                this.aliveAtom = createAtom("alive");
            }
            this.aliveAtom.reportObserved();
            return this.isAlive;
        },
        enumerable: true,
        configurable: true
    });
    BaseNode.prototype.baseFinalizeCreation = function (whenFinalized) {
        if (devMode()) {
            if (!this.isAlive) {
                // istanbul ignore next
                throw fail("assertion failed: cannot finalize the creation of a node that is already dead");
            }
        }
        // goal: afterCreate hooks runs depth-first. After attach runs parent first, so on afterAttach the parent has completed already
        if (this.state === NodeLifeCycle.CREATED) {
            if (this.parent) {
                if (this.parent.state !== NodeLifeCycle.FINALIZED) {
                    // parent not ready yet, postpone
                    return;
                }
                this.fireHook(Hook.afterAttach);
            }
            this.state = NodeLifeCycle.FINALIZED;
            if (whenFinalized) {
                whenFinalized();
            }
        }
    };
    BaseNode.prototype.baseFinalizeDeath = function () {
        if (this._hookSubscribers) {
            this._hookSubscribers.clearAll();
        }
        this._subpathUponDeath = this._subpath;
        this._pathUponDeath = this.getEscapedPath(false);
        this.baseSetParent(null, "");
        this.state = NodeLifeCycle.DEAD;
    };
    BaseNode.prototype.baseAboutToDie = function () {
        this.fireHook(Hook.beforeDestroy);
    };
    return BaseNode;
}());

/**
 * @internal
 * @hidden
 */
var ScalarNode = /** @class */ (function (_super) {
    __extends(ScalarNode, _super);
    function ScalarNode(simpleType, parent, subpath, environment, initialSnapshot) {
        var _this = _super.call(this, simpleType, parent, subpath, environment) || this;
        try {
            _this.storedValue = simpleType.createNewInstance(initialSnapshot);
        }
        catch (e) {
            // short-cut to die the instance, to avoid the snapshot computed starting to throw...
            _this.state = NodeLifeCycle.DEAD;
            throw e;
        }
        _this.state = NodeLifeCycle.CREATED;
        // for scalar nodes there's no point in firing this event since it would fire on the constructor, before
        // anybody can actually register for/listen to it
        // this.fireHook(Hook.AfterCreate)
        _this.finalizeCreation();
        return _this;
    }
    Object.defineProperty(ScalarNode.prototype, "root", {
        get: function () {
            // future optimization: store root ref in the node and maintain it
            if (!this.parent)
                throw fail$1("This scalar node is not part of a tree");
            return this.parent.root;
        },
        enumerable: true,
        configurable: true
    });
    ScalarNode.prototype.setParent = function (newParent, subpath) {
        var parentChanged = this.parent !== newParent;
        var subpathChanged = this.subpath !== subpath;
        if (!parentChanged && !subpathChanged) {
            return;
        }
        if (devMode()) {
            if (!subpath) {
                // istanbul ignore next
                throw fail$1("assertion failed: subpath expected");
            }
            if (!newParent) {
                // istanbul ignore next
                throw fail$1("assertion failed: parent expected");
            }
            if (parentChanged) {
                // istanbul ignore next
                throw fail$1("assertion failed: scalar nodes cannot change their parent");
            }
        }
        this.environment = undefined; // use parent's
        this.baseSetParent(this.parent, subpath);
    };
    Object.defineProperty(ScalarNode.prototype, "snapshot", {
        get: function () {
            return freeze(this.getSnapshot());
        },
        enumerable: true,
        configurable: true
    });
    ScalarNode.prototype.getSnapshot = function () {
        return this.type.getSnapshot(this);
    };
    ScalarNode.prototype.toString = function () {
        var path = (this.isAlive ? this.path : this.pathUponDeath) || "<root>";
        return this.type.name + "@" + path + (this.isAlive ? "" : " [dead]");
    };
    ScalarNode.prototype.die = function () {
        if (!this.isAlive || this.state === NodeLifeCycle.DETACHING)
            return;
        this.aboutToDie();
        this.finalizeDeath();
    };
    ScalarNode.prototype.finalizeCreation = function () {
        this.baseFinalizeCreation();
    };
    ScalarNode.prototype.aboutToDie = function () {
        this.baseAboutToDie();
    };
    ScalarNode.prototype.finalizeDeath = function () {
        this.baseFinalizeDeath();
    };
    ScalarNode.prototype.fireHook = function (name) {
        this.fireInternalHook(name);
    };
    __decorate([
        action
    ], ScalarNode.prototype, "die", null);
    return ScalarNode;
}(BaseNode));

var nextNodeId = 1;
var snapshotReactionOptions = {
    onError: function (e) {
        throw e;
    }
};
/**
 * @internal
 * @hidden
 */
var ObjectNode = /** @class */ (function (_super) {
    __extends(ObjectNode, _super);
    function ObjectNode(complexType, parent, subpath, environment, initialValue) {
        var _this = _super.call(this, complexType, parent, subpath, environment) || this;
        _this.nodeId = ++nextNodeId;
        _this.isProtectionEnabled = true;
        _this._autoUnbox = true; // unboxing is disabled when reading child nodes
        _this._isRunningAction = false; // only relevant for root
        _this._hasSnapshotReaction = false;
        _this._observableInstanceState = 0 /* UNINITIALIZED */;
        _this._cachedInitialSnapshotCreated = false;
        _this.unbox = _this.unbox.bind(_this);
        _this._initialSnapshot = freeze(initialValue);
        _this.identifierAttribute = complexType.identifierAttribute;
        if (!parent) {
            _this.identifierCache = new IdentifierCache();
        }
        _this._childNodes = complexType.initializeChildNodes(_this, _this._initialSnapshot);
        // identifier can not be changed during lifecycle of a node
        // so we safely can read it from initial snapshot
        _this.identifier = null;
        _this.unnormalizedIdentifier = null;
        if (_this.identifierAttribute && _this._initialSnapshot) {
            var id = _this._initialSnapshot[_this.identifierAttribute];
            if (id === undefined) {
                // try with the actual node if not (for optional identifiers)
                var childNode = _this._childNodes[_this.identifierAttribute];
                if (childNode) {
                    id = childNode.value;
                }
            }
            if (typeof id !== "string" && typeof id !== "number") {
                throw fail$1("Instance identifier '" + _this.identifierAttribute + "' for type '" + _this.type.name + "' must be a string or a number");
            }
            // normalize internal identifier to string
            _this.identifier = normalizeIdentifier(id);
            _this.unnormalizedIdentifier = id;
        }
        if (!parent) {
            _this.identifierCache.addNodeToCache(_this);
        }
        else {
            parent.root.identifierCache.addNodeToCache(_this);
        }
        return _this;
    }
    ObjectNode.prototype.applyPatches = function (patches) {
        this.createObservableInstanceIfNeeded();
        this._applyPatches(patches);
    };
    ObjectNode.prototype.applySnapshot = function (snapshot) {
        this.createObservableInstanceIfNeeded();
        this._applySnapshot(snapshot);
    };
    ObjectNode.prototype.createObservableInstanceIfNeeded = function () {
        var e_1, _a;
        if (this._observableInstanceState !== 0 /* UNINITIALIZED */) {
            return;
        }
        if (devMode()) {
            if (this.state !== NodeLifeCycle.INITIALIZING) {
                // istanbul ignore next
                throw fail$1("assertion failed: the creation of the observable instance must be done on the initializing phase");
            }
        }
        this._observableInstanceState = 1 /* CREATING */;
        // make sure the parent chain is created as well
        // array with parent chain from parent to child
        var parentChain = [];
        var parent = this.parent;
        // for performance reasons we never go back further than the most direct
        // uninitialized parent
        // this is done to avoid traversing the whole tree to the root when using
        // the same reference again
        while (parent &&
            parent._observableInstanceState === 0 /* UNINITIALIZED */) {
            parentChain.unshift(parent);
            parent = parent.parent;
        }
        try {
            // initialize the uninitialized parent chain from parent to child
            for (var parentChain_1 = __values(parentChain), parentChain_1_1 = parentChain_1.next(); !parentChain_1_1.done; parentChain_1_1 = parentChain_1.next()) {
                var p = parentChain_1_1.value;
                p.createObservableInstanceIfNeeded();
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (parentChain_1_1 && !parentChain_1_1.done && (_a = parentChain_1.return)) _a.call(parentChain_1);
            }
            finally { if (e_1) throw e_1.error; }
        }
        var type = this.type;
        try {
            this.storedValue = type.createNewInstance(this._childNodes);
            this.preboot();
            this._isRunningAction = true;
            type.finalizeNewInstance(this, this.storedValue);
        }
        catch (e) {
            // short-cut to die the instance, to avoid the snapshot computed starting to throw...
            this.state = NodeLifeCycle.DEAD;
            throw e;
        }
        finally {
            this._isRunningAction = false;
        }
        this._observableInstanceState = 2 /* CREATED */;
        // NOTE: we need to touch snapshot, because non-observable
        // "_observableInstanceState" field was touched
        invalidateComputed(this, "snapshot");
        if (this.isRoot)
            this._addSnapshotReaction();
        this._childNodes = EMPTY_OBJECT;
        this.state = NodeLifeCycle.CREATED;
        this.fireHook(Hook.afterCreate);
        this.finalizeCreation();
    };
    Object.defineProperty(ObjectNode.prototype, "root", {
        get: function () {
            var parent = this.parent;
            return parent ? parent.root : this;
        },
        enumerable: true,
        configurable: true
    });
    ObjectNode.prototype.clearParent = function () {
        if (!this.parent)
            return;
        // detach if attached
        this.fireHook(Hook.beforeDetach);
        var previousState = this.state;
        this.state = NodeLifeCycle.DETACHING;
        var root = this.root;
        var newEnv = root.environment;
        var newIdCache = root.identifierCache.splitCache(this);
        try {
            this.parent.removeChild(this.subpath);
            this.baseSetParent(null, "");
            this.environment = newEnv;
            this.identifierCache = newIdCache;
        }
        finally {
            this.state = previousState;
        }
    };
    ObjectNode.prototype.setParent = function (newParent, subpath) {
        var parentChanged = newParent !== this.parent;
        var subpathChanged = subpath !== this.subpath;
        if (!parentChanged && !subpathChanged) {
            return;
        }
        if (devMode()) {
            if (!subpath) {
                // istanbul ignore next
                throw fail$1("assertion failed: subpath expected");
            }
            if (!newParent) {
                // istanbul ignore next
                throw fail$1("assertion failed: new parent expected");
            }
            if (this.parent && parentChanged) {
                throw fail$1("A node cannot exists twice in the state tree. Failed to add " + this + " to path '" + newParent.path + "/" + subpath + "'.");
            }
            if (!this.parent && newParent.root === this) {
                throw fail$1("A state tree is not allowed to contain itself. Cannot assign " + this + " to path '" + newParent.path + "/" + subpath + "'");
            }
            if (!this.parent &&
                !!this.environment &&
                this.environment !== newParent.root.environment) {
                throw fail$1("A state tree cannot be made part of another state tree as long as their environments are different.");
            }
        }
        if (parentChanged) {
            // attach to new parent
            this.environment = undefined; // will use root's
            newParent.root.identifierCache.mergeCache(this);
            this.baseSetParent(newParent, subpath);
            this.fireHook(Hook.afterAttach);
        }
        else if (subpathChanged) {
            // moving to a new subpath on the same parent
            this.baseSetParent(this.parent, subpath);
        }
    };
    ObjectNode.prototype.fireHook = function (name) {
        var _this = this;
        this.fireInternalHook(name);
        var fn = this.storedValue &&
            typeof this.storedValue === "object" &&
            this.storedValue[name];
        if (typeof fn === "function") {
            // we check for it to allow old mobx peer dependencies that don't have the method to work (even when still bugged)
            if (_allowStateChangesInsideComputed) {
                _allowStateChangesInsideComputed(function () {
                    fn.apply(_this.storedValue);
                });
            }
            else {
                fn.apply(this.storedValue);
            }
        }
    };
    Object.defineProperty(ObjectNode.prototype, "snapshot", {
        // advantage of using computed for a snapshot is that nicely respects transactions etc.
        get: function () {
            return freeze(this.getSnapshot());
        },
        enumerable: true,
        configurable: true
    });
    // NOTE: we use this method to get snapshot without creating @computed overhead
    ObjectNode.prototype.getSnapshot = function () {
        if (!this.isAlive)
            return this._snapshotUponDeath;
        return this._observableInstanceState === 2 /* CREATED */
            ? this._getActualSnapshot()
            : this._getCachedInitialSnapshot();
    };
    ObjectNode.prototype._getActualSnapshot = function () {
        return this.type.getSnapshot(this);
    };
    ObjectNode.prototype._getCachedInitialSnapshot = function () {
        if (!this._cachedInitialSnapshotCreated) {
            var type = this.type;
            var childNodes = this._childNodes;
            var snapshot = this._initialSnapshot;
            this._cachedInitialSnapshot = type.processInitialSnapshot(childNodes, snapshot);
            this._cachedInitialSnapshotCreated = true;
        }
        return this._cachedInitialSnapshot;
    };
    ObjectNode.prototype.isRunningAction = function () {
        if (this._isRunningAction)
            return true;
        if (this.isRoot)
            return false;
        return this.parent.isRunningAction();
    };
    ObjectNode.prototype.assertAlive = function (context) {
        var livelinessChecking = getLivelinessChecking();
        if (!this.isAlive && livelinessChecking !== "ignore") {
            var error = this._getAssertAliveError(context);
            switch (livelinessChecking) {
                case "error":
                    throw fail$1(error);
                case "warn":
                    warnError(error);
            }
        }
    };
    ObjectNode.prototype._getAssertAliveError = function (context) {
        var escapedPath = this.getEscapedPath(false) || this.pathUponDeath || "";
        var subpath = (context.subpath && escapeJsonPath(context.subpath)) || "";
        var actionContext = context.actionContext || getCurrentActionContext();
        // try to use a real action context if possible since it includes the action name
        if (actionContext && actionContext.type !== "action" && actionContext.parentActionEvent) {
            actionContext = actionContext.parentActionEvent;
        }
        var actionFullPath = "";
        if (actionContext && actionContext.name != null) {
            // try to use the context, and if it not available use the node one
            var actionPath = (actionContext && actionContext.context && getPath(actionContext.context)) ||
                escapedPath;
            actionFullPath = actionPath + "." + actionContext.name + "()";
        }
        return "You are trying to read or write to an object that is no longer part of a state tree. (Object type: '" + this.type.name + "', Path upon death: '" + escapedPath + "', Subpath: '" + subpath + "', Action: '" + actionFullPath + "'). Either detach nodes first, or don't use objects after removing / replacing them in the tree.";
    };
    ObjectNode.prototype.getChildNode = function (subpath) {
        this.assertAlive({
            subpath: subpath
        });
        this._autoUnbox = false;
        try {
            return this._observableInstanceState === 2 /* CREATED */
                ? this.type.getChildNode(this, subpath)
                : this._childNodes[subpath];
        }
        finally {
            this._autoUnbox = true;
        }
    };
    ObjectNode.prototype.getChildren = function () {
        this.assertAlive(EMPTY_OBJECT);
        this._autoUnbox = false;
        try {
            return this._observableInstanceState === 2 /* CREATED */
                ? this.type.getChildren(this)
                : convertChildNodesToArray(this._childNodes);
        }
        finally {
            this._autoUnbox = true;
        }
    };
    ObjectNode.prototype.getChildType = function (propertyName) {
        return this.type.getChildType(propertyName);
    };
    Object.defineProperty(ObjectNode.prototype, "isProtected", {
        get: function () {
            return this.root.isProtectionEnabled;
        },
        enumerable: true,
        configurable: true
    });
    ObjectNode.prototype.assertWritable = function (context) {
        this.assertAlive(context);
        if (!this.isRunningAction() && this.isProtected) {
            throw fail$1("Cannot modify '" + this + "', the object is protected and can only be modified by using an action.");
        }
    };
    ObjectNode.prototype.removeChild = function (subpath) {
        this.type.removeChild(this, subpath);
    };
    // bound on the constructor
    ObjectNode.prototype.unbox = function (childNode) {
        if (!childNode)
            return childNode;
        this.assertAlive({
            subpath: childNode.subpath || childNode.subpathUponDeath
        });
        return this._autoUnbox ? childNode.value : childNode;
    };
    ObjectNode.prototype.toString = function () {
        var path = (this.isAlive ? this.path : this.pathUponDeath) || "<root>";
        var identifier = this.identifier ? "(id: " + this.identifier + ")" : "";
        return this.type.name + "@" + path + identifier + (this.isAlive ? "" : " [dead]");
    };
    ObjectNode.prototype.finalizeCreation = function () {
        var _this = this;
        this.baseFinalizeCreation(function () {
            var e_2, _a;
            try {
                for (var _b = __values(_this.getChildren()), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var child = _c.value;
                    child.finalizeCreation();
                }
            }
            catch (e_2_1) { e_2 = { error: e_2_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_2) throw e_2.error; }
            }
            _this.fireInternalHook(Hook.afterCreationFinalization);
        });
    };
    ObjectNode.prototype.detach = function () {
        if (!this.isAlive)
            throw fail$1("Error while detaching, node is not alive.");
        this.clearParent();
    };
    ObjectNode.prototype.preboot = function () {
        var self = this;
        this._applyPatches = createActionInvoker(this.storedValue, "@APPLY_PATCHES", function (patches) {
            patches.forEach(function (patch) {
                var parts = splitJsonPath(patch.path);
                var node = resolveNodeByPathParts(self, parts.slice(0, -1));
                node.applyPatchLocally(parts[parts.length - 1], patch);
            });
        });
        this._applySnapshot = createActionInvoker(this.storedValue, "@APPLY_SNAPSHOT", function (snapshot) {
            // if the snapshot is the same as the current one, avoid performing a reconcile
            if (snapshot === self.snapshot)
                return;
            // else, apply it by calling the type logic
            return self.type.applySnapshot(self, snapshot);
        });
        addHiddenFinalProp(this.storedValue, "$treenode", this);
        addHiddenFinalProp(this.storedValue, "toJSON", toJSON);
    };
    ObjectNode.prototype.die = function () {
        if (!this.isAlive || this.state === NodeLifeCycle.DETACHING)
            return;
        this.aboutToDie();
        this.finalizeDeath();
    };
    ObjectNode.prototype.aboutToDie = function () {
        if (this._observableInstanceState === 0 /* UNINITIALIZED */) {
            return;
        }
        this.getChildren().forEach(function (node) {
            node.aboutToDie();
        });
        // beforeDestroy should run before the disposers since else we could end up in a situation where
        // a disposer added with addDisposer at this stage (beforeDestroy) is actually never released
        this.baseAboutToDie();
        this._internalEventsEmit("dispose" /* Dispose */);
        this._internalEventsClear("dispose" /* Dispose */);
    };
    ObjectNode.prototype.finalizeDeath = function () {
        // invariant: not called directly but from "die"
        this.getChildren().forEach(function (node) {
            node.finalizeDeath();
        });
        this.root.identifierCache.notifyDied(this);
        // "kill" the computed prop and just store the last snapshot
        var snapshot = this.snapshot;
        this._snapshotUponDeath = snapshot;
        this._internalEventsClearAll();
        this.baseFinalizeDeath();
    };
    ObjectNode.prototype.onSnapshot = function (onChange) {
        this._addSnapshotReaction();
        return this._internalEventsRegister("snapshot" /* Snapshot */, onChange);
    };
    ObjectNode.prototype.emitSnapshot = function (snapshot) {
        this._internalEventsEmit("snapshot" /* Snapshot */, snapshot);
    };
    ObjectNode.prototype.onPatch = function (handler) {
        return this._internalEventsRegister("patch" /* Patch */, handler);
    };
    ObjectNode.prototype.emitPatch = function (basePatch, source) {
        if (this._internalEventsHasSubscribers("patch" /* Patch */)) {
            var localizedPatch = extend({}, basePatch, {
                path: source.path.substr(this.path.length) + "/" + basePatch.path // calculate the relative path of the patch
            });
            var _a = __read(splitPatch(localizedPatch), 2), patch = _a[0], reversePatch = _a[1];
            this._internalEventsEmit("patch" /* Patch */, patch, reversePatch);
        }
        if (this.parent)
            this.parent.emitPatch(basePatch, source);
    };
    ObjectNode.prototype.hasDisposer = function (disposer) {
        return this._internalEventsHas("dispose" /* Dispose */, disposer);
    };
    ObjectNode.prototype.addDisposer = function (disposer) {
        if (!this.hasDisposer(disposer)) {
            this._internalEventsRegister("dispose" /* Dispose */, disposer, true);
            return;
        }
        throw fail$1("cannot add a disposer when it is already registered for execution");
    };
    ObjectNode.prototype.removeDisposer = function (disposer) {
        if (!this._internalEventsHas("dispose" /* Dispose */, disposer)) {
            throw fail$1("cannot remove a disposer which was never registered for execution");
        }
        this._internalEventsUnregister("dispose" /* Dispose */, disposer);
    };
    ObjectNode.prototype.removeMiddleware = function (middleware) {
        if (this.middlewares) {
            var index = this.middlewares.indexOf(middleware);
            if (index >= 0) {
                this.middlewares.splice(index, 1);
            }
        }
    };
    ObjectNode.prototype.addMiddleWare = function (handler, includeHooks) {
        var _this = this;
        if (includeHooks === void 0) { includeHooks = true; }
        var middleware = { handler: handler, includeHooks: includeHooks };
        if (!this.middlewares)
            this.middlewares = [middleware];
        else
            this.middlewares.push(middleware);
        return function () {
            _this.removeMiddleware(middleware);
        };
    };
    ObjectNode.prototype.applyPatchLocally = function (subpath, patch) {
        this.assertWritable({
            subpath: subpath
        });
        this.createObservableInstanceIfNeeded();
        this.type.applyPatchLocally(this, subpath, patch);
    };
    ObjectNode.prototype._addSnapshotReaction = function () {
        var _this = this;
        if (!this._hasSnapshotReaction) {
            var snapshotDisposer = reaction(function () { return _this.snapshot; }, function (snapshot) { return _this.emitSnapshot(snapshot); }, snapshotReactionOptions);
            this.addDisposer(snapshotDisposer);
            this._hasSnapshotReaction = true;
        }
    };
    // we proxy the methods to avoid creating an EventHandlers instance when it is not needed
    ObjectNode.prototype._internalEventsHasSubscribers = function (event) {
        return !!this._internalEvents && this._internalEvents.hasSubscribers(event);
    };
    ObjectNode.prototype._internalEventsRegister = function (event, eventHandler, atTheBeginning) {
        if (atTheBeginning === void 0) { atTheBeginning = false; }
        if (!this._internalEvents) {
            this._internalEvents = new EventHandlers();
        }
        return this._internalEvents.register(event, eventHandler, atTheBeginning);
    };
    ObjectNode.prototype._internalEventsHas = function (event, eventHandler) {
        return !!this._internalEvents && this._internalEvents.has(event, eventHandler);
    };
    ObjectNode.prototype._internalEventsUnregister = function (event, eventHandler) {
        if (this._internalEvents) {
            this._internalEvents.unregister(event, eventHandler);
        }
    };
    ObjectNode.prototype._internalEventsEmit = function (event) {
        var _a;
        var args = [];
        for (var _i = 1; _i < arguments.length; _i++) {
            args[_i - 1] = arguments[_i];
        }
        if (this._internalEvents) {
            (_a = this._internalEvents).emit.apply(_a, __spread([event], args));
        }
    };
    ObjectNode.prototype._internalEventsClear = function (event) {
        if (this._internalEvents) {
            this._internalEvents.clear(event);
        }
    };
    ObjectNode.prototype._internalEventsClearAll = function () {
        if (this._internalEvents) {
            this._internalEvents.clearAll();
        }
    };
    __decorate([
        action
    ], ObjectNode.prototype, "createObservableInstanceIfNeeded", null);
    __decorate([
        computed
    ], ObjectNode.prototype, "snapshot", null);
    __decorate([
        action
    ], ObjectNode.prototype, "detach", null);
    __decorate([
        action
    ], ObjectNode.prototype, "die", null);
    return ObjectNode;
}(BaseNode));

/**
 * @internal
 * @hidden
 */
var TypeFlags;
(function (TypeFlags) {
    TypeFlags[TypeFlags["String"] = 1] = "String";
    TypeFlags[TypeFlags["Number"] = 2] = "Number";
    TypeFlags[TypeFlags["Boolean"] = 4] = "Boolean";
    TypeFlags[TypeFlags["Date"] = 8] = "Date";
    TypeFlags[TypeFlags["Literal"] = 16] = "Literal";
    TypeFlags[TypeFlags["Array"] = 32] = "Array";
    TypeFlags[TypeFlags["Map"] = 64] = "Map";
    TypeFlags[TypeFlags["Object"] = 128] = "Object";
    TypeFlags[TypeFlags["Frozen"] = 256] = "Frozen";
    TypeFlags[TypeFlags["Optional"] = 512] = "Optional";
    TypeFlags[TypeFlags["Reference"] = 1024] = "Reference";
    TypeFlags[TypeFlags["Identifier"] = 2048] = "Identifier";
    TypeFlags[TypeFlags["Late"] = 4096] = "Late";
    TypeFlags[TypeFlags["Refinement"] = 8192] = "Refinement";
    TypeFlags[TypeFlags["Union"] = 16384] = "Union";
    TypeFlags[TypeFlags["Null"] = 32768] = "Null";
    TypeFlags[TypeFlags["Undefined"] = 65536] = "Undefined";
    TypeFlags[TypeFlags["Integer"] = 131072] = "Integer";
    TypeFlags[TypeFlags["Custom"] = 262144] = "Custom";
    TypeFlags[TypeFlags["SnapshotProcessor"] = 524288] = "SnapshotProcessor";
})(TypeFlags || (TypeFlags = {}));
/**
 * @internal
 * @hidden
 */
var cannotDetermineSubtype = "cannotDetermine";
/**
 * A base type produces a MST node (Node in the state tree)
 *
 * @internal
 * @hidden
 */
var BaseType = /** @class */ (function () {
    function BaseType(name) {
        this.isType = true;
        this.name = name;
    }
    BaseType.prototype.create = function (snapshot, environment) {
        typecheckInternal(this, snapshot);
        return this.instantiate(null, "", environment, snapshot).value;
    };
    BaseType.prototype.getSnapshot = function (node, applyPostProcess) {
        // istanbul ignore next
        throw fail$1("unimplemented method");
    };
    BaseType.prototype.isAssignableFrom = function (type) {
        return type === this;
    };
    BaseType.prototype.validate = function (value, context) {
        var node = getStateTreeNodeSafe(value);
        if (node) {
            var valueType = getType(value);
            return this.isAssignableFrom(valueType)
                ? typeCheckSuccess()
                : typeCheckFailure(context, value);
            // it is tempting to compare snapshots, but in that case we should always clone on assignments...
        }
        return this.isValidSnapshot(value, context);
    };
    BaseType.prototype.is = function (thing) {
        return this.validate(thing, [{ path: "", type: this }]).length === 0;
    };
    Object.defineProperty(BaseType.prototype, "Type", {
        get: function () {
            // istanbul ignore next
            throw fail$1("Factory.Type should not be actually called. It is just a Type signature that can be used at compile time with Typescript, by using `typeof type.Type`");
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseType.prototype, "TypeWithoutSTN", {
        get: function () {
            // istanbul ignore next
            throw fail$1("Factory.TypeWithoutSTN should not be actually called. It is just a Type signature that can be used at compile time with Typescript, by using `typeof type.TypeWithoutSTN`");
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseType.prototype, "SnapshotType", {
        get: function () {
            // istanbul ignore next
            throw fail$1("Factory.SnapshotType should not be actually called. It is just a Type signature that can be used at compile time with Typescript, by using `typeof type.SnapshotType`");
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(BaseType.prototype, "CreationType", {
        get: function () {
            // istanbul ignore next
            throw fail$1("Factory.CreationType should not be actually called. It is just a Type signature that can be used at compile time with Typescript, by using `typeof type.CreationType`");
        },
        enumerable: true,
        configurable: true
    });
    __decorate([
        action
    ], BaseType.prototype, "create", null);
    return BaseType;
}());
/**
 * A complex type produces a MST node (Node in the state tree)
 *
 * @internal
 * @hidden
 */
var ComplexType = /** @class */ (function (_super) {
    __extends(ComplexType, _super);
    function ComplexType(name) {
        return _super.call(this, name) || this;
    }
    ComplexType.prototype.create = function (snapshot, environment) {
        if (snapshot === void 0) { snapshot = this.getDefaultSnapshot(); }
        return _super.prototype.create.call(this, snapshot, environment);
    };
    ComplexType.prototype.getValue = function (node) {
        node.createObservableInstanceIfNeeded();
        return node.storedValue;
    };
    ComplexType.prototype.tryToReconcileNode = function (current, newValue) {
        if (current.isDetaching)
            return false;
        if (current.snapshot === newValue) {
            // newValue is the current snapshot of the node, noop
            return true;
        }
        if (isStateTreeNode(newValue) && getStateTreeNode(newValue) === current) {
            // the current node is the same as the new one
            return true;
        }
        if (current.type === this &&
            isMutable(newValue) &&
            !isStateTreeNode(newValue) &&
            (!current.identifierAttribute ||
                current.identifier ===
                    normalizeIdentifier(newValue[current.identifierAttribute]))) {
            // the newValue has no node, so can be treated like a snapshot
            // we can reconcile
            current.applySnapshot(newValue);
            return true;
        }
        return false;
    };
    ComplexType.prototype.reconcile = function (current, newValue, parent, subpath) {
        var nodeReconciled = this.tryToReconcileNode(current, newValue);
        if (nodeReconciled) {
            current.setParent(parent, subpath);
            return current;
        }
        // current node cannot be recycled in any way
        current.die(); // noop if detaching
        // attempt to reuse the new one
        if (isStateTreeNode(newValue) && this.isAssignableFrom(getType(newValue))) {
            // newValue is a Node as well, move it here..
            var newNode = getStateTreeNode(newValue);
            newNode.setParent(parent, subpath);
            return newNode;
        }
        // nothing to do, we have to create a new node
        return this.instantiate(parent, subpath, undefined, newValue);
    };
    ComplexType.prototype.getSubTypes = function () {
        return null;
    };
    __decorate([
        action
    ], ComplexType.prototype, "create", null);
    return ComplexType;
}(BaseType));
/**
 * @internal
 * @hidden
 */
var SimpleType = /** @class */ (function (_super) {
    __extends(SimpleType, _super);
    function SimpleType() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    SimpleType.prototype.createNewInstance = function (snapshot) {
        return snapshot;
    };
    SimpleType.prototype.getValue = function (node) {
        // if we ever find a case where scalar nodes can be accessed without iterating through its parent
        // uncomment this to make sure the parent chain is created when this is accessed
        // if (node.parent) {
        //     node.parent.createObservableInstanceIfNeeded()
        // }
        return node.storedValue;
    };
    SimpleType.prototype.getSnapshot = function (node) {
        return node.storedValue;
    };
    SimpleType.prototype.reconcile = function (current, newValue, parent, subpath) {
        // reconcile only if type and value are still the same, and only if the node is not detaching
        if (!current.isDetaching && current.type === this && current.storedValue === newValue) {
            return current;
        }
        var res = this.instantiate(parent, subpath, undefined, newValue);
        current.die(); // noop if detaching
        return res;
    };
    SimpleType.prototype.getSubTypes = function () {
        return null;
    };
    return SimpleType;
}(BaseType));
/**
 * Returns if a given value represents a type.
 *
 * @param value Value to check.
 * @returns `true` if the value is a type.
 */
function isType(value) {
    return typeof value === "object" && value && value.isType === true;
}
/**
 * @internal
 * @hidden
 */
function assertIsType(type, argNumber) {
    assertArg(type, isType, "mobx-state-tree type", argNumber);
}

var runningActions = new Map();
/**
 * Note: Consider migrating to `createActionTrackingMiddleware2`, it is easier to use.
 *
 * Convenience utility to create action based middleware that supports async processes more easily.
 * All hooks are called for both synchronous and asynchronous actions. Except that either `onSuccess` or `onFail` is called
 *
 * The create middleware tracks the process of an action (assuming it passes the `filter`).
 * `onResume` can return any value, which will be passed as second argument to any other hook. This makes it possible to keep state during a process.
 *
 * See the `atomic` middleware for an example
 *
 * @param hooks
 * @returns
 */
function createActionTrackingMiddleware(hooks) {
    return function actionTrackingMiddleware(call, next, abort) {
        switch (call.type) {
            case "action": {
                if (!hooks.filter || hooks.filter(call) === true) {
                    var context = hooks.onStart(call);
                    hooks.onResume(call, context);
                    runningActions.set(call.id, {
                        call: call,
                        context: context,
                        async: false
                    });
                    try {
                        var res = next(call);
                        hooks.onSuspend(call, context);
                        if (runningActions.get(call.id).async === false) {
                            runningActions.delete(call.id);
                            hooks.onSuccess(call, context, res);
                        }
                        return res;
                    }
                    catch (e) {
                        runningActions.delete(call.id);
                        hooks.onFail(call, context, e);
                        throw e;
                    }
                }
                else {
                    return next(call);
                }
            }
            case "flow_spawn": {
                var root = runningActions.get(call.rootId);
                root.async = true;
                return next(call);
            }
            case "flow_resume":
            case "flow_resume_error": {
                var root = runningActions.get(call.rootId);
                hooks.onResume(call, root.context);
                try {
                    return next(call);
                }
                finally {
                    hooks.onSuspend(call, root.context);
                }
            }
            case "flow_throw": {
                var root = runningActions.get(call.rootId);
                runningActions.delete(call.rootId);
                hooks.onFail(call, root.context, call.args[0]);
                return next(call);
            }
            case "flow_return": {
                var root = runningActions.get(call.rootId);
                runningActions.delete(call.rootId);
                hooks.onSuccess(call, root.context, call.args[0]);
                return next(call);
            }
        }
    };
}

var RunningAction = /** @class */ (function () {
    function RunningAction(hooks, call) {
        this.hooks = hooks;
        this.call = call;
        this.flowsPending = 0;
        this.running = true;
        if (hooks) {
            hooks.onStart(call);
        }
    }
    RunningAction.prototype.finish = function (error) {
        if (this.running) {
            this.running = false;
            if (this.hooks) {
                this.hooks.onFinish(this.call, error);
            }
        }
    };
    RunningAction.prototype.incFlowsPending = function () {
        this.flowsPending++;
    };
    RunningAction.prototype.decFlowsPending = function () {
        this.flowsPending--;
    };
    Object.defineProperty(RunningAction.prototype, "hasFlowsPending", {
        get: function () {
            return this.flowsPending > 0;
        },
        enumerable: true,
        configurable: true
    });
    return RunningAction;
}());
/**
 * Convenience utility to create action based middleware that supports async processes more easily.
 * The flow is like this:
 * - for each action: if filter passes -> `onStart` -> (inner actions recursively) -> `onFinish`
 *
 * Example: if we had an action `a` that called inside an action `b1`, then `b2` the flow would be:
 * - `filter(a)`
 * - `onStart(a)`
 *   - `filter(b1)`
 *   - `onStart(b1)`
 *   - `onFinish(b1)`
 *   - `filter(b2)`
 *   - `onStart(b2)`
 *   - `onFinish(b2)`
 * - `onFinish(a)`
 *
 * The flow is the same no matter if the actions are sync or async.
 *
 * See the `atomic` middleware for an example
 *
 * @param hooks
 * @returns
 */
function createActionTrackingMiddleware2(middlewareHooks) {
    var runningActions = new WeakMap();
    return function actionTrackingMiddleware(call, next) {
        // find parentRunningAction
        var parentRunningAction = call.parentActionEvent
            ? runningActions.get(call.parentActionEvent)
            : undefined;
        if (call.type === "action") {
            var newCall = __assign(__assign({}, call), { 
                // make a shallow copy of the parent action env
                env: parentRunningAction && parentRunningAction.call.env, parentCall: parentRunningAction && parentRunningAction.call });
            var passesFilter = !middlewareHooks.filter || middlewareHooks.filter(newCall);
            var hooks = passesFilter ? middlewareHooks : undefined;
            var runningAction = new RunningAction(hooks, newCall);
            runningActions.set(call, runningAction);
            var res = void 0;
            try {
                res = next(call);
            }
            catch (e) {
                runningAction.finish(e);
                throw e;
            }
            if (!runningAction.hasFlowsPending) {
                // sync action finished
                runningAction.finish();
            }
            return res;
        }
        else {
            if (!parentRunningAction) {
                return next(call);
            }
            switch (call.type) {
                case "flow_spawn": {
                    parentRunningAction.incFlowsPending();
                    return next(call);
                }
                case "flow_resume":
                case "flow_resume_error": {
                    return next(call);
                }
                case "flow_throw": {
                    var error = call.args[0];
                    try {
                        return next(call);
                    }
                    finally {
                        parentRunningAction.decFlowsPending();
                        if (!parentRunningAction.hasFlowsPending) {
                            parentRunningAction.finish(error);
                        }
                    }
                }
                case "flow_return": {
                    try {
                        return next(call);
                    }
                    finally {
                        parentRunningAction.decFlowsPending();
                        if (!parentRunningAction.hasFlowsPending) {
                            parentRunningAction.finish();
                        }
                    }
                }
            }
        }
    };
}

function serializeArgument(node, actionName, index, arg) {
    if (arg instanceof Date)
        return { $MST_DATE: arg.getTime() };
    if (isPrimitive(arg))
        return arg;
    // We should not serialize MST nodes, even if we can, because we don't know if the receiving party can handle a raw snapshot instead of an
    // MST type instance. So if one wants to serialize a MST node that was pass in, either explitly pass: 1: an id, 2: a (relative) path, 3: a snapshot
    if (isStateTreeNode(arg))
        return serializeTheUnserializable("[MSTNode: " + getType(arg).name + "]");
    if (typeof arg === "function")
        return serializeTheUnserializable("[function]");
    if (typeof arg === "object" && !isPlainObject(arg) && !isArray(arg))
        return serializeTheUnserializable("[object " + ((arg && arg.constructor && arg.constructor.name) ||
            "Complex Object") + "]");
    try {
        // Check if serializable, cycle free etc...
        // MWE: there must be a better way....
        JSON.stringify(arg); // or throws
        return arg;
    }
    catch (e) {
        return serializeTheUnserializable("" + e);
    }
}
function deserializeArgument(adm, value) {
    if (value && typeof value === "object" && "$MST_DATE" in value)
        return new Date(value["$MST_DATE"]);
    return value;
}
function serializeTheUnserializable(baseType) {
    return {
        $MST_UNSERIALIZABLE: true,
        type: baseType
    };
}
/**
 * Applies an action or a series of actions in a single MobX transaction.
 * Does not return any value
 * Takes an action description as produced by the `onAction` middleware.
 *
 * @param target
 * @param actions
 */
function applyAction(target, actions) {
    // check all arguments
    assertIsStateTreeNode(target, 1);
    assertArg(actions, function (a) { return typeof a === "object"; }, "object or array", 2);
    runInAction(function () {
        asArray(actions).forEach(function (action) { return baseApplyAction(target, action); });
    });
}
function baseApplyAction(target, action) {
    var resolvedTarget = tryResolve(target, action.path || "");
    if (!resolvedTarget)
        throw fail$1("Invalid action path: " + (action.path || ""));
    var node = getStateTreeNode(resolvedTarget);
    // Reserved functions
    if (action.name === "@APPLY_PATCHES") {
        return applyPatch.call(null, resolvedTarget, action.args[0]);
    }
    if (action.name === "@APPLY_SNAPSHOT") {
        return applySnapshot.call(null, resolvedTarget, action.args[0]);
    }
    if (!(typeof resolvedTarget[action.name] === "function"))
        throw fail$1("Action '" + action.name + "' does not exist in '" + node.path + "'");
    return resolvedTarget[action.name].apply(resolvedTarget, action.args ? action.args.map(function (v) { return deserializeArgument(node, v); }) : []);
}
/**
 * Small abstraction around `onAction` and `applyAction`, attaches an action listener to a tree and records all the actions emitted.
 * Returns an recorder object with the following signature:
 *
 * Example:
 * ```ts
 * export interface IActionRecorder {
 *      // the recorded actions
 *      actions: ISerializedActionCall[]
 *      // true if currently recording
 *      recording: boolean
 *      // stop recording actions
 *      stop(): void
 *      // resume recording actions
 *      resume(): void
 *      // apply all the recorded actions on the given object
 *      replay(target: IAnyStateTreeNode): void
 * }
 * ```
 *
 * The optional filter function allows to skip recording certain actions.
 *
 * @param subject
 * @returns
 */
function recordActions(subject, filter) {
    // check all arguments
    assertIsStateTreeNode(subject, 1);
    var actions = [];
    var listener = function (call) {
        var recordThis = filter ? filter(call, getRunningActionContext()) : true;
        if (recordThis) {
            actions.push(call);
        }
    };
    var disposer;
    var recorder = {
        actions: actions,
        get recording() {
            return !!disposer;
        },
        stop: function () {
            if (disposer) {
                disposer();
                disposer = undefined;
            }
        },
        resume: function () {
            if (disposer)
                return;
            disposer = onAction(subject, listener);
        },
        replay: function (target) {
            applyAction(target, actions);
        }
    };
    recorder.resume();
    return recorder;
}
/**
 * Registers a function that will be invoked for each action that is called on the provided model instance, or to any of its children.
 * See [actions](https://github.com/mobxjs/mobx-state-tree#actions) for more details. onAction events are emitted only for the outermost called action in the stack.
 * Action can also be intercepted by middleware using addMiddleware to change the function call before it will be run.
 *
 * Not all action arguments might be serializable. For unserializable arguments, a struct like `{ $MST_UNSERIALIZABLE: true, type: "someType" }` will be generated.
 * MST Nodes are considered non-serializable as well (they could be serialized as there snapshot, but it is uncertain whether an replaying party will be able to handle such a non-instantiated snapshot).
 * Rather, when using `onAction` middleware, one should consider in passing arguments which are 1: an id, 2: a (relative) path, or 3: a snapshot. Instead of a real MST node.
 *
 * Example:
 * ```ts
 * const Todo = types.model({
 *   task: types.string
 * })
 *
 * const TodoStore = types.model({
 *   todos: types.array(Todo)
 * }).actions(self => ({
 *   add(todo) {
 *     self.todos.push(todo);
 *   }
 * }))
 *
 * const s = TodoStore.create({ todos: [] })
 *
 * let disposer = onAction(s, (call) => {
 *   console.log(call);
 * })
 *
 * s.add({ task: "Grab a coffee" })
 * // Logs: { name: "add", path: "", args: [{ task: "Grab a coffee" }] }
 * ```
 *
 * @param target
 * @param listener
 * @param attachAfter (default false) fires the listener *after* the action has executed instead of before.
 * @returns
 */
function onAction(target, listener, attachAfter) {
    if (attachAfter === void 0) { attachAfter = false; }
    // check all arguments
    assertIsStateTreeNode(target, 1);
    if (devMode()) {
        if (!isRoot(target))
            warnError("Warning: Attaching onAction listeners to non root nodes is dangerous: No events will be emitted for actions initiated higher up in the tree.");
        if (!isProtected(target))
            warnError("Warning: Attaching onAction listeners to non protected nodes is dangerous: No events will be emitted for direct modifications without action.");
    }
    return addMiddleware(target, function handler(rawCall, next) {
        if (rawCall.type === "action" && rawCall.id === rawCall.rootId) {
            var sourceNode_1 = getStateTreeNode(rawCall.context);
            var info = {
                name: rawCall.name,
                path: getRelativePathBetweenNodes(getStateTreeNode(target), sourceNode_1),
                args: rawCall.args.map(function (arg, index) {
                    return serializeArgument(sourceNode_1, rawCall.name, index, arg);
                })
            };
            if (attachAfter) {
                var res = next(rawCall);
                listener(info);
                return res;
            }
            else {
                listener(info);
                return next(rawCall);
            }
        }
        else {
            return next(rawCall);
        }
    });
}

var nextActionId = 1;
var currentActionContext;
/**
 * @internal
 * @hidden
 */
function getCurrentActionContext() {
    return currentActionContext;
}
/**
 * @internal
 * @hidden
 */
function getNextActionId() {
    return nextActionId++;
}
// TODO: optimize away entire action context if there is no middleware in tree?
/**
 * @internal
 * @hidden
 */
function runWithActionContext(context, fn) {
    var node = getStateTreeNode(context.context);
    if (context.type === "action") {
        node.assertAlive({
            actionContext: context
        });
    }
    var baseIsRunningAction = node._isRunningAction;
    node._isRunningAction = true;
    var previousContext = currentActionContext;
    currentActionContext = context;
    try {
        return runMiddleWares(node, context, fn);
    }
    finally {
        currentActionContext = previousContext;
        node._isRunningAction = baseIsRunningAction;
    }
}
/**
 * @internal
 * @hidden
 */
function getParentActionContext(parentContext) {
    if (!parentContext)
        return undefined;
    if (parentContext.type === "action")
        return parentContext;
    return parentContext.parentActionEvent;
}
/**
 * @internal
 * @hidden
 */
function createActionInvoker(target, name, fn) {
    var res = function () {
        var id = getNextActionId();
        var parentContext = currentActionContext;
        var parentActionContext = getParentActionContext(parentContext);
        return runWithActionContext({
            type: "action",
            name: name,
            id: id,
            args: argsToArray(arguments),
            context: target,
            tree: getRoot(target),
            rootId: parentContext ? parentContext.rootId : id,
            parentId: parentContext ? parentContext.id : 0,
            allParentIds: parentContext
                ? __spread(parentContext.allParentIds, [parentContext.id]) : [],
            parentEvent: parentContext,
            parentActionEvent: parentActionContext
        }, fn);
    };
    res._isMSTAction = true;
    return res;
}
/**
 * Middleware can be used to intercept any action is invoked on the subtree where it is attached.
 * If a tree is protected (by default), this means that any mutation of the tree will pass through your middleware.
 *
 * For more details, see the [middleware docs](../middleware.md)
 *
 * @param target Node to apply the middleware to.
 * @param middleware Middleware to apply.
 * @returns A callable function to dispose the middleware.
 */
function addMiddleware(target, handler, includeHooks) {
    if (includeHooks === void 0) { includeHooks = true; }
    var node = getStateTreeNode(target);
    if (devMode()) {
        if (!node.isProtectionEnabled) {
            warnError("It is recommended to protect the state tree before attaching action middleware, as otherwise it cannot be guaranteed that all changes are passed through middleware. See `protect`");
        }
    }
    return node.addMiddleWare(handler, includeHooks);
}
/**
 * Binds middleware to a specific action.
 *
 * Example:
 * ```ts
 * type.actions(self => {
 *   function takeA____() {
 *       self.toilet.donate()
 *       self.wipe()
 *       self.wipe()
 *       self.toilet.flush()
 *   }
 *   return {
 *     takeA____: decorate(atomic, takeA____)
 *   }
 * })
 * ```
 *
 * @param handler
 * @param fn
 * @param includeHooks
 * @returns The original function
 */
function decorate(handler, fn, includeHooks) {
    if (includeHooks === void 0) { includeHooks = true; }
    var middleware = { handler: handler, includeHooks: includeHooks };
    fn.$mst_middleware = fn.$mst_middleware || [];
    fn.$mst_middleware.push(middleware);
    return fn;
}
var CollectedMiddlewares = /** @class */ (function () {
    function CollectedMiddlewares(node, fn) {
        this.arrayIndex = 0;
        this.inArrayIndex = 0;
        this.middlewares = [];
        // we just push middleware arrays into an array of arrays to avoid making copies
        if (fn.$mst_middleware) {
            this.middlewares.push(fn.$mst_middleware);
        }
        var n = node;
        // Find all middlewares. Optimization: cache this?
        while (n) {
            if (n.middlewares)
                this.middlewares.push(n.middlewares);
            n = n.parent;
        }
    }
    Object.defineProperty(CollectedMiddlewares.prototype, "isEmpty", {
        get: function () {
            return this.middlewares.length <= 0;
        },
        enumerable: true,
        configurable: true
    });
    CollectedMiddlewares.prototype.getNextMiddleware = function () {
        var array = this.middlewares[this.arrayIndex];
        if (!array)
            return undefined;
        var item = array[this.inArrayIndex++];
        if (!item) {
            this.arrayIndex++;
            this.inArrayIndex = 0;
            return this.getNextMiddleware();
        }
        return item;
    };
    return CollectedMiddlewares;
}());
function runMiddleWares(node, baseCall, originalFn) {
    var middlewares = new CollectedMiddlewares(node, originalFn);
    // Short circuit
    if (middlewares.isEmpty)
        return action(originalFn).apply(null, baseCall.args);
    var result = null;
    function runNextMiddleware(call) {
        var middleware = middlewares.getNextMiddleware();
        var handler = middleware && middleware.handler;
        if (!handler) {
            return action(originalFn).apply(null, call.args);
        }
        // skip hooks if asked to
        if (!middleware.includeHooks && Hook[call.name]) {
            return runNextMiddleware(call);
        }
        var nextInvoked = false;
        function next(call2, callback) {
            nextInvoked = true;
            // the result can contain
            // - the non manipulated return value from an action
            // - the non manipulated abort value
            // - one of the above but manipulated through the callback function
            result = runNextMiddleware(call2);
            if (callback) {
                result = callback(result);
            }
        }
        var abortInvoked = false;
        function abort(value) {
            abortInvoked = true;
            // overwrite the result
            // can be manipulated through middlewares earlier in the queue using the callback fn
            result = value;
        }
        handler(call, next, abort);
        if (devMode()) {
            if (!nextInvoked && !abortInvoked) {
                var node2 = getStateTreeNode(call.tree);
                throw fail$1("Neither the next() nor the abort() callback within the middleware " + handler.name + " for the action: \"" + call.name + "\" on the node: " + node2.type.name + " was invoked.");
            }
            else if (nextInvoked && abortInvoked) {
                var node2 = getStateTreeNode(call.tree);
                throw fail$1("The next() and abort() callback within the middleware " + handler.name + " for the action: \"" + call.name + "\" on the node: " + node2.type.name + " were invoked.");
            }
        }
        return result;
    }
    return runNextMiddleware(baseCall);
}

/**
 * Returns the currently executing MST action context, or undefined if none.
 */
function getRunningActionContext() {
    var current = getCurrentActionContext();
    while (current && current.type !== "action") {
        current = current.parentActionEvent;
    }
    return current;
}
function _isActionContextThisOrChildOf(actionContext, sameOrParent, includeSame) {
    var parentId = typeof sameOrParent === "number" ? sameOrParent : sameOrParent.id;
    var current = includeSame
        ? actionContext
        : actionContext.parentActionEvent;
    while (current) {
        if (current.id === parentId) {
            return true;
        }
        current = current.parentActionEvent;
    }
    return false;
}
/**
 * Returns if the given action context is a parent of this action context.
 */
function isActionContextChildOf(actionContext, parent) {
    return _isActionContextThisOrChildOf(actionContext, parent, false);
}
/**
 * Returns if the given action context is this or a parent of this action context.
 */
function isActionContextThisOrChildOf(actionContext, parentOrThis) {
    return _isActionContextThisOrChildOf(actionContext, parentOrThis, true);
}

function safeStringify(value) {
    try {
        return JSON.stringify(value);
    }
    catch (e) {
        // istanbul ignore next
        return "<Unserializable: " + e + ">";
    }
}
/**
 * @internal
 * @hidden
 */
function prettyPrintValue(value) {
    return typeof value === "function"
        ? "<function" + (value.name ? " " + value.name : "") + ">"
        : isStateTreeNode(value)
            ? "<" + value + ">"
            : "`" + safeStringify(value) + "`";
}
function shortenPrintValue(valueInString) {
    return valueInString.length < 280
        ? valueInString
        : valueInString.substring(0, 272) + "......" + valueInString.substring(valueInString.length - 8);
}
function toErrorString(error) {
    var value = error.value;
    var type = error.context[error.context.length - 1].type;
    var fullPath = error.context
        .map(function (_a) {
        var path = _a.path;
        return path;
    })
        .filter(function (path) { return path.length > 0; })
        .join("/");
    var pathPrefix = fullPath.length > 0 ? "at path \"/" + fullPath + "\" " : "";
    var currentTypename = isStateTreeNode(value)
        ? "value of type " + getStateTreeNode(value).type.name + ":"
        : isPrimitive(value)
            ? "value"
            : "snapshot";
    var isSnapshotCompatible = type && isStateTreeNode(value) && type.is(getStateTreeNode(value).snapshot);
    return ("" + pathPrefix + currentTypename + " " + prettyPrintValue(value) + " is not assignable " + (type ? "to type: `" + type.name + "`" : "") +
        (error.message ? " (" + error.message + ")" : "") +
        (type
            ? isPrimitiveType(type) || isPrimitive(value)
                ? "."
                : ", expected an instance of `" + type.name + "` or a snapshot like `" + type.describe() + "` instead." +
                    (isSnapshotCompatible
                        ? " (Note that a snapshot of the provided value is compatible with the targeted type)"
                        : "")
            : "."));
}
/**
 * @internal
 * @hidden
 */
function getContextForPath(context, path, type) {
    return context.concat([{ path: path, type: type }]);
}
/**
 * @internal
 * @hidden
 */
function typeCheckSuccess() {
    return EMPTY_ARRAY;
}
/**
 * @internal
 * @hidden
 */
function typeCheckFailure(context, value, message) {
    return [{ context: context, value: value, message: message }];
}
/**
 * @internal
 * @hidden
 */
function flattenTypeErrors(errors) {
    return errors.reduce(function (a, i) { return a.concat(i); }, []);
}
// TODO; doublecheck: typecheck should only needed to be invoked from: type.create and array / map / value.property will change
/**
 * @internal
 * @hidden
 */
function typecheckInternal(type, value) {
    // runs typeChecking if it is in dev-mode or through a process.env.ENABLE_TYPE_CHECK flag
    if (isTypeCheckingEnabled()) {
        typecheck(type, value);
    }
}
/**
 * Run's the typechecker for the given type on the given value, which can be a snapshot or an instance.
 * Throws if the given value is not according the provided type specification.
 * Use this if you need typechecks even in a production build (by default all automatic runtime type checks will be skipped in production builds)
 *
 * @param type Type to check against.
 * @param value Value to be checked, either a snapshot or an instance.
 */
function typecheck(type, value) {
    var errors = type.validate(value, [{ path: "", type: type }]);
    if (errors.length > 0) {
        throw fail$1(validationErrorsToString(type, value, errors));
    }
}
function validationErrorsToString(type, value, errors) {
    if (errors.length === 0) {
        return undefined;
    }
    return ("Error while converting " + shortenPrintValue(prettyPrintValue(value)) + " to `" + type.name + "`:\n\n    " + errors.map(toErrorString).join("\n    "));
}

var identifierCacheId = 0;
/**
 * @internal
 * @hidden
 */
var IdentifierCache = /** @class */ (function () {
    function IdentifierCache() {
        this.cacheId = identifierCacheId++;
        // n.b. in cache all identifiers are normalized to strings
        this.cache = observable.map();
        // last time the cache (array) for a given time changed
        // n.b. it is not really the time, but just an integer that gets increased after each modification to the array
        this.lastCacheModificationPerId = observable.map();
    }
    IdentifierCache.prototype.updateLastCacheModificationPerId = function (identifier) {
        var lcm = this.lastCacheModificationPerId.get(identifier);
        // we start at 1 since 0 means no update since cache creation
        this.lastCacheModificationPerId.set(identifier, lcm === undefined ? 1 : lcm + 1);
    };
    IdentifierCache.prototype.getLastCacheModificationPerId = function (identifier) {
        var modificationId = this.lastCacheModificationPerId.get(identifier) || 0;
        return this.cacheId + "-" + modificationId;
    };
    IdentifierCache.prototype.addNodeToCache = function (node, lastCacheUpdate) {
        if (lastCacheUpdate === void 0) { lastCacheUpdate = true; }
        if (node.identifierAttribute) {
            var identifier = node.identifier;
            if (!this.cache.has(identifier)) {
                this.cache.set(identifier, observable.array([], mobxShallow));
            }
            var set = this.cache.get(identifier);
            if (set.indexOf(node) !== -1)
                throw fail$1("Already registered");
            set.push(node);
            if (lastCacheUpdate) {
                this.updateLastCacheModificationPerId(identifier);
            }
        }
    };
    IdentifierCache.prototype.mergeCache = function (node) {
        var _this = this;
        values(node.identifierCache.cache).forEach(function (nodes) {
            return nodes.forEach(function (child) {
                _this.addNodeToCache(child);
            });
        });
    };
    IdentifierCache.prototype.notifyDied = function (node) {
        if (node.identifierAttribute) {
            var id = node.identifier;
            var set = this.cache.get(id);
            if (set) {
                set.remove(node);
                // remove empty sets from cache
                if (!set.length) {
                    this.cache.delete(id);
                }
                this.updateLastCacheModificationPerId(node.identifier);
            }
        }
    };
    IdentifierCache.prototype.splitCache = function (node) {
        var _this = this;
        var res = new IdentifierCache();
        var basePath = node.path;
        entries(this.cache).forEach(function (_a) {
            var _b = __read(_a, 2), id = _b[0], nodes = _b[1];
            var modified = false;
            for (var i = nodes.length - 1; i >= 0; i--) {
                if (nodes[i].path.indexOf(basePath) === 0) {
                    res.addNodeToCache(nodes[i], false); // no need to update lastUpdated since it is a whole new cache
                    nodes.splice(i, 1);
                    modified = true;
                }
            }
            if (modified) {
                _this.updateLastCacheModificationPerId(id);
            }
        });
        return res;
    };
    IdentifierCache.prototype.has = function (type, identifier) {
        var set = this.cache.get(identifier);
        if (!set)
            return false;
        return set.some(function (candidate) { return type.isAssignableFrom(candidate.type); });
    };
    IdentifierCache.prototype.resolve = function (type, identifier) {
        var set = this.cache.get(identifier);
        if (!set)
            return null;
        var matches = set.filter(function (candidate) { return type.isAssignableFrom(candidate.type); });
        switch (matches.length) {
            case 0:
                return null;
            case 1:
                return matches[0];
            default:
                throw fail$1("Cannot resolve a reference to type '" + type.name + "' with id: '" + identifier + "' unambigously, there are multiple candidates: " + matches
                    .map(function (n) { return n.path; })
                    .join(", "));
        }
    };
    return IdentifierCache;
}());

/**
 * @internal
 * @hidden
 */
function createObjectNode(type, parent, subpath, environment, initialValue) {
    var existingNode = getStateTreeNodeSafe(initialValue);
    if (existingNode) {
        if (existingNode.parent) {
            // istanbul ignore next
            throw fail$1("Cannot add an object to a state tree if it is already part of the same or another state tree. Tried to assign an object to '" + (parent ? parent.path : "") + "/" + subpath + "', but it lives already at '" + existingNode.path + "'");
        }
        if (parent) {
            existingNode.setParent(parent, subpath);
        }
        // else it already has no parent since it is a pre-requisite
        return existingNode;
    }
    // not a node, a snapshot
    return new ObjectNode(type, parent, subpath, environment, initialValue);
}
/**
 * @internal
 * @hidden
 */
function createScalarNode(type, parent, subpath, environment, initialValue) {
    return new ScalarNode(type, parent, subpath, environment, initialValue);
}
/**
 * @internal
 * @hidden
 */
function isNode(value) {
    return value instanceof ScalarNode || value instanceof ObjectNode;
}

/**
 * @internal
 * @hidden
 */
var NodeLifeCycle;
(function (NodeLifeCycle) {
    NodeLifeCycle[NodeLifeCycle["INITIALIZING"] = 0] = "INITIALIZING";
    NodeLifeCycle[NodeLifeCycle["CREATED"] = 1] = "CREATED";
    NodeLifeCycle[NodeLifeCycle["FINALIZED"] = 2] = "FINALIZED";
    NodeLifeCycle[NodeLifeCycle["DETACHING"] = 3] = "DETACHING";
    NodeLifeCycle[NodeLifeCycle["DEAD"] = 4] = "DEAD"; // no coming back from this one
})(NodeLifeCycle || (NodeLifeCycle = {}));
/**
 * Returns true if the given value is a node in a state tree.
 * More precisely, that is, if the value is an instance of a
 * `types.model`, `types.array` or `types.map`.
 *
 * @param value
 * @returns true if the value is a state tree node.
 */
function isStateTreeNode(value) {
    return !!(value && value.$treenode);
}
/**
 * @internal
 * @hidden
 */
function assertIsStateTreeNode(value, argNumber) {
    assertArg(value, isStateTreeNode, "mobx-state-tree node", argNumber);
}
/**
 * @internal
 * @hidden
 */
function getStateTreeNode(value) {
    if (!isStateTreeNode(value)) {
        // istanbul ignore next
        throw fail$1("Value " + value + " is no MST Node");
    }
    return value.$treenode;
}
/**
 * @internal
 * @hidden
 */
function getStateTreeNodeSafe(value) {
    return (value && value.$treenode) || null;
}
/**
 * @internal
 * @hidden
 */
function toJSON() {
    return getStateTreeNode(this).snapshot;
}
var doubleDot = function (_) { return ".."; };
/**
 * @internal
 * @hidden
 */
function getRelativePathBetweenNodes(base, target) {
    // PRE condition target is (a child of) base!
    if (base.root !== target.root) {
        throw fail$1("Cannot calculate relative path: objects '" + base + "' and '" + target + "' are not part of the same object tree");
    }
    var baseParts = splitJsonPath(base.path);
    var targetParts = splitJsonPath(target.path);
    var common = 0;
    for (; common < baseParts.length; common++) {
        if (baseParts[common] !== targetParts[common])
            break;
    }
    // TODO: assert that no targetParts paths are "..", "." or ""!
    return (baseParts
        .slice(common)
        .map(doubleDot)
        .join("/") + joinJsonPath(targetParts.slice(common)));
}
/**
 * @internal
 * @hidden
 */
function resolveNodeByPath(base, path, failIfResolveFails) {
    if (failIfResolveFails === void 0) { failIfResolveFails = true; }
    return resolveNodeByPathParts(base, splitJsonPath(path), failIfResolveFails);
}
/**
 * @internal
 * @hidden
 */
function resolveNodeByPathParts(base, pathParts, failIfResolveFails) {
    if (failIfResolveFails === void 0) { failIfResolveFails = true; }
    var current = base;
    for (var i = 0; i < pathParts.length; i++) {
        var part = pathParts[i];
        if (part === "..") {
            current = current.parent;
            if (current)
                continue; // not everything has a parent
        }
        else if (part === ".") {
            continue;
        }
        else if (current) {
            if (current instanceof ScalarNode) {
                // check if the value of a scalar resolves to a state tree node (e.g. references)
                // then we can continue resolving...
                try {
                    var value = current.value;
                    if (isStateTreeNode(value)) {
                        current = getStateTreeNode(value);
                        // fall through
                    }
                }
                catch (e) {
                    if (!failIfResolveFails) {
                        return undefined;
                    }
                    throw e;
                }
            }
            if (current instanceof ObjectNode) {
                var subType = current.getChildType(part);
                if (subType) {
                    current = current.getChildNode(part);
                    if (current)
                        continue;
                }
            }
        }
        if (failIfResolveFails)
            throw fail$1("Could not resolve '" + part + "' in path '" + (joinJsonPath(pathParts.slice(0, i)) ||
                "/") + "' while resolving '" + joinJsonPath(pathParts) + "'");
        else
            return undefined;
    }
    return current;
}
/**
 * @internal
 * @hidden
 */
function convertChildNodesToArray(childNodes) {
    if (!childNodes)
        return EMPTY_ARRAY;
    var keys = Object.keys(childNodes);
    if (!keys.length)
        return EMPTY_ARRAY;
    var result = new Array(keys.length);
    keys.forEach(function (key, index) {
        result[index] = childNodes[key];
    });
    return result;
}

// based on: https://github.com/mobxjs/mobx-utils/blob/master/src/async-action.ts
/*
    All contents of this file are deprecated.

    The term `process` has been replaced with `flow` to avoid conflicts with the
    global `process` object.

    Refer to `flow.ts` for any further changes to this implementation.
*/
var DEPRECATION_MESSAGE = "See https://github.com/mobxjs/mobx-state-tree/issues/399 for more information. " +
    "Note that the middleware event types starting with `process` now start with `flow`.";
/**
 * @hidden
 *
 * @deprecated has been renamed to `flow()`.
 * See https://github.com/mobxjs/mobx-state-tree/issues/399 for more information.
 * Note that the middleware event types starting with `process` now start with `flow`.
 *
 * @returns {Promise}
 */
function process$1(asyncAction) {
    deprecated("process", "`process()` has been renamed to `flow()`. " + DEPRECATION_MESSAGE);
    return flow(asyncAction);
}

/**
 * @internal
 * @hidden
 */
var EMPTY_ARRAY = Object.freeze([]);
/**
 * @internal
 * @hidden
 */
var EMPTY_OBJECT = Object.freeze({});
/**
 * @internal
 * @hidden
 */
var mobxShallow = typeof $mobx === "string" ? { deep: false } : { deep: false, proxy: false };
Object.freeze(mobxShallow);
/**
 * @internal
 * @hidden
 */
function fail$1(message) {
    if (message === void 0) { message = "Illegal state"; }
    return new Error("[mobx-state-tree] " + message);
}
/**
 * @internal
 * @hidden
 */
function identity(_) {
    return _;
}
/**
 * pollyfill (for IE) suggested in MDN:
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger
 * @internal
 * @hidden
 */
var isInteger = Number.isInteger ||
    function (value) {
        return typeof value === "number" && isFinite(value) && Math.floor(value) === value;
    };
/**
 * @internal
 * @hidden
 */
function isArray(val) {
    return Array.isArray(val) || isObservableArray(val);
}
/**
 * @internal
 * @hidden
 */
function asArray(val) {
    if (!val)
        return EMPTY_ARRAY;
    if (isArray(val))
        return val;
    return [val];
}
/**
 * @internal
 * @hidden
 */
function extend(a) {
    var b = [];
    for (var _i = 1; _i < arguments.length; _i++) {
        b[_i - 1] = arguments[_i];
    }
    for (var i = 0; i < b.length; i++) {
        var current = b[i];
        for (var key in current)
            a[key] = current[key];
    }
    return a;
}
/**
 * @internal
 * @hidden
 */
function isPlainObject(value) {
    if (value === null || typeof value !== "object")
        return false;
    var proto = Object.getPrototypeOf(value);
    return proto === Object.prototype || proto === null;
}
/**
 * @internal
 * @hidden
 */
function isMutable(value) {
    return (value !== null &&
        typeof value === "object" &&
        !(value instanceof Date) &&
        !(value instanceof RegExp));
}
/**
 * @internal
 * @hidden
 */
function isPrimitive(value, includeDate) {
    if (includeDate === void 0) { includeDate = true; }
    if (value === null || value === undefined)
        return true;
    if (typeof value === "string" ||
        typeof value === "number" ||
        typeof value === "boolean" ||
        (includeDate && value instanceof Date))
        return true;
    return false;
}
/**
 * @internal
 * @hidden
 * Freeze a value and return it (if not in production)
 */
function freeze(value) {
    if (!devMode())
        return value;
    return isPrimitive(value) || isObservableArray(value) ? value : Object.freeze(value);
}
/**
 * @internal
 * @hidden
 * Recursively freeze a value (if not in production)
 */
function deepFreeze(value) {
    if (!devMode())
        return value;
    freeze(value);
    if (isPlainObject(value)) {
        Object.keys(value).forEach(function (propKey) {
            if (!isPrimitive(value[propKey]) &&
                !Object.isFrozen(value[propKey])) {
                deepFreeze(value[propKey]);
            }
        });
    }
    return value;
}
/**
 * @internal
 * @hidden
 */
function isSerializable(value) {
    return typeof value !== "function";
}
/**
 * @internal
 * @hidden
 */
function addHiddenFinalProp(object, propName, value) {
    Object.defineProperty(object, propName, {
        enumerable: false,
        writable: false,
        configurable: true,
        value: value
    });
}
/**
 * @internal
 * @hidden
 */
function addHiddenWritableProp(object, propName, value) {
    Object.defineProperty(object, propName, {
        enumerable: false,
        writable: true,
        configurable: true,
        value: value
    });
}
/**
 * @internal
 * @hidden
 */
var EventHandler = /** @class */ (function () {
    function EventHandler() {
        this.handlers = [];
    }
    Object.defineProperty(EventHandler.prototype, "hasSubscribers", {
        get: function () {
            return this.handlers.length > 0;
        },
        enumerable: true,
        configurable: true
    });
    EventHandler.prototype.register = function (fn, atTheBeginning) {
        var _this = this;
        if (atTheBeginning === void 0) { atTheBeginning = false; }
        if (atTheBeginning) {
            this.handlers.unshift(fn);
        }
        else {
            this.handlers.push(fn);
        }
        return function () {
            _this.unregister(fn);
        };
    };
    EventHandler.prototype.has = function (fn) {
        return this.handlers.indexOf(fn) >= 0;
    };
    EventHandler.prototype.unregister = function (fn) {
        var index = this.handlers.indexOf(fn);
        if (index >= 0) {
            this.handlers.splice(index, 1);
        }
    };
    EventHandler.prototype.clear = function () {
        this.handlers.length = 0;
    };
    EventHandler.prototype.emit = function () {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        // make a copy just in case it changes
        var handlers = this.handlers.slice();
        handlers.forEach(function (f) { return f.apply(void 0, __spread(args)); });
    };
    return EventHandler;
}());
/**
 * @internal
 * @hidden
 */
var EventHandlers = /** @class */ (function () {
    function EventHandlers() {
    }
    EventHandlers.prototype.hasSubscribers = function (event) {
        var handler = this.eventHandlers && this.eventHandlers[event];
        return !!handler && handler.hasSubscribers;
    };
    EventHandlers.prototype.register = function (event, fn, atTheBeginning) {
        if (atTheBeginning === void 0) { atTheBeginning = false; }
        if (!this.eventHandlers) {
            this.eventHandlers = {};
        }
        var handler = this.eventHandlers[event];
        if (!handler) {
            handler = this.eventHandlers[event] = new EventHandler();
        }
        return handler.register(fn, atTheBeginning);
    };
    EventHandlers.prototype.has = function (event, fn) {
        var handler = this.eventHandlers && this.eventHandlers[event];
        return !!handler && handler.has(fn);
    };
    EventHandlers.prototype.unregister = function (event, fn) {
        var handler = this.eventHandlers && this.eventHandlers[event];
        if (handler) {
            handler.unregister(fn);
        }
    };
    EventHandlers.prototype.clear = function (event) {
        if (this.eventHandlers) {
            delete this.eventHandlers[event];
        }
    };
    EventHandlers.prototype.clearAll = function () {
        this.eventHandlers = undefined;
    };
    EventHandlers.prototype.emit = function (event) {
        var _a;
        var args = [];
        for (var _i = 1; _i < arguments.length; _i++) {
            args[_i - 1] = arguments[_i];
        }
        var handler = this.eventHandlers && this.eventHandlers[event];
        if (handler) {
            (_a = handler).emit.apply(_a, __spread(args));
        }
    };
    return EventHandlers;
}());
/**
 * @internal
 * @hidden
 */
function argsToArray(args) {
    var res = new Array(args.length);
    for (var i = 0; i < args.length; i++)
        res[i] = args[i];
    return res;
}
/**
 * @internal
 * @hidden
 */
function invalidateComputed(target, propName) {
    var atom = getAtom(target, propName);
    atom.trackAndCompute();
}
/**
 * @internal
 * @hidden
 */
function stringStartsWith(str, beginning) {
    return str.indexOf(beginning) === 0;
}
/**
 * @internal
 * @hidden
 */
var deprecated = function (id, message) {
    // skip if running production
    if (!devMode())
        return;
    // warn if hasn't been warned before
    if (deprecated.ids && !deprecated.ids.hasOwnProperty(id)) {
        warnError("Deprecation warning: " + message);
    }
    // mark as warned to avoid duplicate warn message
    if (deprecated.ids)
        deprecated.ids[id] = true;
};
deprecated.ids = {};
/**
 * @internal
 * @hidden
 */
function warnError(msg) {
    console.warn(new Error("[mobx-state-tree] " + msg));
}
/**
 * @internal
 * @hidden
 */
function isTypeCheckingEnabled() {
    return (devMode() ||
        (typeof process !== "undefined" && process.env && process.env.ENABLE_TYPE_CHECK === "true"));
}
/**
 * @internal
 * @hidden
 */
function devMode() {
    return process.env.NODE_ENV !== "production";
}
/**
 * @internal
 * @hidden
 */
function assertArg(value, fn, typeName, argNumber) {
    if (devMode()) {
        if (!fn(value)) {
            // istanbul ignore next
            throw fail$1("expected " + typeName + " as argument " + asArray(argNumber).join(" or ") + ", got " + value + " instead");
        }
    }
}
/**
 * @internal
 * @hidden
 */
function assertIsFunction(value, argNumber) {
    assertArg(value, function (fn) { return typeof fn === "function"; }, "function", argNumber);
}
/**
 * @internal
 * @hidden
 */
function assertIsNumber(value, argNumber, min, max) {
    assertArg(value, function (n) { return typeof n === "number"; }, "number", argNumber);
    if (min !== undefined) {
        assertArg(value, function (n) { return n >= min; }, "number greater than " + min, argNumber);
    }
    if (max !== undefined) {
        assertArg(value, function (n) { return n <= max; }, "number lesser than " + max, argNumber);
    }
}
/**
 * @internal
 * @hidden
 */
function assertIsString(value, argNumber, canBeEmpty) {
    if (canBeEmpty === void 0) { canBeEmpty = true; }
    assertArg(value, function (s) { return typeof s === "string"; }, "string", argNumber);
    if (!canBeEmpty) {
        assertArg(value, function (s) { return s !== ""; }, "not empty string", argNumber);
    }
}

/**
 * See [asynchronous actions](https://github.com/mobxjs/mobx-state-tree/blob/master/docs/async-actions.md).
 *
 * @returns The flow as a promise.
 */
function flow(generator) {
    return createFlowSpawner(generator.name, generator);
}
/**
 * @deprecated Not needed since TS3.6.
 * Used for TypeScript to make flows that return a promise return the actual promise result.
 *
 * @param val
 * @returns
 */
function castFlowReturn(val) {
    return val;
}
/**
 * @internal
 * @hidden
 */
function createFlowSpawner(name, generator) {
    var spawner = function flowSpawner() {
        // Implementation based on https://github.com/tj/co/blob/master/index.js
        var runId = getNextActionId();
        var parentContext = getCurrentActionContext();
        if (!parentContext) {
            throw fail$1("a mst flow must always have a parent context");
        }
        var parentActionContext = getParentActionContext(parentContext);
        if (!parentActionContext) {
            throw fail$1("a mst flow must always have a parent action context");
        }
        var contextBase = {
            name: name,
            id: runId,
            tree: parentContext.tree,
            context: parentContext.context,
            parentId: parentContext.id,
            allParentIds: __spread(parentContext.allParentIds, [parentContext.id]),
            rootId: parentContext.rootId,
            parentEvent: parentContext,
            parentActionEvent: parentActionContext
        };
        var args = arguments;
        function wrap(fn, type, arg) {
            fn.$mst_middleware = spawner.$mst_middleware; // pick up any middleware attached to the flow
            runWithActionContext(__assign(__assign({}, contextBase), { type: type, args: [arg] }), fn);
        }
        return new Promise(function (resolve, reject) {
            var gen;
            var init = function asyncActionInit() {
                gen = generator.apply(null, arguments);
                onFulfilled(undefined); // kick off the flow
            };
            init.$mst_middleware = spawner.$mst_middleware;
            runWithActionContext(__assign(__assign({}, contextBase), { type: "flow_spawn", args: argsToArray(args) }), init);
            function onFulfilled(res) {
                var ret;
                try {
                    // prettier-ignore
                    wrap(function (r) { ret = gen.next(r); }, "flow_resume", res);
                }
                catch (e) {
                    // prettier-ignore
                    setImmediate(function () {
                        wrap(function (r) { reject(e); }, "flow_throw", e);
                    });
                    return;
                }
                next(ret);
                return;
            }
            function onRejected(err) {
                var ret;
                try {
                    // prettier-ignore
                    wrap(function (r) { ret = gen.throw(r); }, "flow_resume_error", err); // or yieldError?
                }
                catch (e) {
                    // prettier-ignore
                    setImmediate(function () {
                        wrap(function (r) { reject(e); }, "flow_throw", e);
                    });
                    return;
                }
                next(ret);
            }
            function next(ret) {
                if (ret.done) {
                    // prettier-ignore
                    setImmediate(function () {
                        wrap(function (r) { resolve(r); }, "flow_return", ret.value);
                    });
                    return;
                }
                // TODO: support more type of values? See https://github.com/tj/co/blob/249bbdc72da24ae44076afd716349d2089b31c4c/index.js#L100
                if (!ret.value || typeof ret.value.then !== "function") {
                    // istanbul ignore next
                    throw fail$1("Only promises can be yielded to `async`, got: " + ret);
                }
                return ret.value.then(onFulfilled, onRejected);
            }
        });
    };
    return spawner;
}

/**
 * @internal
 * @hidden
 */
function splitPatch(patch) {
    if (!("oldValue" in patch))
        throw fail$1("Patches without `oldValue` field cannot be inversed");
    return [stripPatch(patch), invertPatch(patch)];
}
/**
 * @internal
 * @hidden
 */
function stripPatch(patch) {
    // strips `oldvalue` information from the patch, so that it becomes a patch conform the json-patch spec
    // this removes the ability to undo the patch
    switch (patch.op) {
        case "add":
            return { op: "add", path: patch.path, value: patch.value };
        case "remove":
            return { op: "remove", path: patch.path };
        case "replace":
            return { op: "replace", path: patch.path, value: patch.value };
    }
}
function invertPatch(patch) {
    switch (patch.op) {
        case "add":
            return {
                op: "remove",
                path: patch.path
            };
        case "remove":
            return {
                op: "add",
                path: patch.path,
                value: patch.oldValue
            };
        case "replace":
            return {
                op: "replace",
                path: patch.path,
                value: patch.oldValue
            };
    }
}
/**
 * Simple simple check to check it is a number.
 */
function isNumber(x) {
    return typeof x === "number";
}
/**
 * Escape slashes and backslashes.
 *
 * http://tools.ietf.org/html/rfc6901
 */
function escapeJsonPath(path) {
    if (isNumber(path) === true) {
        return "" + path;
    }
    if (path.indexOf("/") === -1 && path.indexOf("~") === -1)
        return path;
    return path.replace(/~/g, "~0").replace(/\//g, "~1");
}
/**
 * Unescape slashes and backslashes.
 */
function unescapeJsonPath(path) {
    return path.replace(/~1/g, "/").replace(/~0/g, "~");
}
/**
 * Generates a json-path compliant json path from path parts.
 *
 * @param path
 * @returns
 */
function joinJsonPath(path) {
    // `/` refers to property with an empty name, while `` refers to root itself!
    if (path.length === 0)
        return "";
    var getPathStr = function (p) { return p.map(escapeJsonPath).join("/"); };
    if (path[0] === "." || path[0] === "..") {
        // relative
        return getPathStr(path);
    }
    else {
        // absolute
        return "/" + getPathStr(path);
    }
}
/**
 * Splits and decodes a json path into several parts.
 *
 * @param path
 * @returns
 */
function splitJsonPath(path) {
    // `/` refers to property with an empty name, while `` refers to root itself!
    var parts = path.split("/").map(unescapeJsonPath);
    var valid = path === "" ||
        path === "." ||
        path === ".." ||
        stringStartsWith(path, "/") ||
        stringStartsWith(path, "./") ||
        stringStartsWith(path, "../");
    if (!valid) {
        throw fail$1("a json path must be either rooted, empty or relative, but got '" + path + "'");
    }
    // '/a/b/c' -> ["a", "b", "c"]
    // '../../b/c' -> ["..", "..", "b", "c"]
    // '' -> []
    // '/' -> ['']
    // './a' -> [".", "a"]
    // /./a' -> [".", "a"] equivalent to './a'
    if (parts[0] === "") {
        parts.shift();
    }
    return parts;
}

var SnapshotProcessor = /** @class */ (function (_super) {
    __extends(SnapshotProcessor, _super);
    function SnapshotProcessor(_subtype, _processors, name) {
        var _this = _super.call(this, name || _subtype.name) || this;
        _this._subtype = _subtype;
        _this._processors = _processors;
        return _this;
    }
    Object.defineProperty(SnapshotProcessor.prototype, "flags", {
        get: function () {
            return this._subtype.flags | TypeFlags.SnapshotProcessor;
        },
        enumerable: true,
        configurable: true
    });
    SnapshotProcessor.prototype.describe = function () {
        return "snapshotProcessor(" + this._subtype.describe() + ")";
    };
    SnapshotProcessor.prototype.preProcessSnapshot = function (sn) {
        if (this._processors.preProcessor) {
            return this._processors.preProcessor.call(null, sn);
        }
        return sn;
    };
    SnapshotProcessor.prototype.postProcessSnapshot = function (sn) {
        if (this._processors.postProcessor) {
            return this._processors.postProcessor.call(null, sn);
        }
        return sn;
    };
    SnapshotProcessor.prototype._fixNode = function (node) {
        var _this = this;
        // the node has to use these methods rather than the original type ones
        proxyNodeTypeMethods(node.type, this, "isAssignableFrom", "create");
        var oldGetSnapshot = node.getSnapshot;
        node.getSnapshot = function () {
            return _this.postProcessSnapshot(oldGetSnapshot.call(node));
        };
    };
    SnapshotProcessor.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        var processedInitialValue = isStateTreeNode(initialValue)
            ? initialValue
            : this.preProcessSnapshot(initialValue);
        var node = this._subtype.instantiate(parent, subpath, environment, processedInitialValue);
        this._fixNode(node);
        return node;
    };
    SnapshotProcessor.prototype.reconcile = function (current, newValue, parent, subpath) {
        var node = this._subtype.reconcile(current, isStateTreeNode(newValue) ? newValue : this.preProcessSnapshot(newValue), parent, subpath);
        if (node !== current) {
            this._fixNode(node);
        }
        return node;
    };
    SnapshotProcessor.prototype.getSnapshot = function (node, applyPostProcess) {
        if (applyPostProcess === void 0) { applyPostProcess = true; }
        var sn = this._subtype.getSnapshot(node);
        return applyPostProcess ? this.postProcessSnapshot(sn) : sn;
    };
    SnapshotProcessor.prototype.isValidSnapshot = function (value, context) {
        var processedSn = this.preProcessSnapshot(value);
        return this._subtype.validate(processedSn, context);
    };
    SnapshotProcessor.prototype.getSubTypes = function () {
        return this._subtype;
    };
    SnapshotProcessor.prototype.is = function (thing) {
        return (this._subtype.validate(isType(thing) ? this._subtype : this.preProcessSnapshot(thing), [
            { path: "", type: this._subtype }
        ]).length === 0);
    };
    return SnapshotProcessor;
}(BaseType));
function proxyNodeTypeMethods(nodeType, snapshotProcessorType) {
    var e_1, _a;
    var methods = [];
    for (var _i = 2; _i < arguments.length; _i++) {
        methods[_i - 2] = arguments[_i];
    }
    try {
        for (var methods_1 = __values(methods), methods_1_1 = methods_1.next(); !methods_1_1.done; methods_1_1 = methods_1.next()) {
            var method = methods_1_1.value;
            nodeType[method] = snapshotProcessorType[method].bind(snapshotProcessorType);
        }
    }
    catch (e_1_1) { e_1 = { error: e_1_1 }; }
    finally {
        try {
            if (methods_1_1 && !methods_1_1.done && (_a = methods_1.return)) _a.call(methods_1);
        }
        finally { if (e_1) throw e_1.error; }
    }
}
/**
 * `types.snapshotProcessor` - Runs a pre/post snapshot processor before/after serializing a given type.
 *
 * Example:
 * ```ts
 * const Todo1 = types.model({ text: types.string })
 * // in the backend the text type must be null when empty
 * interface BackendTodo {
 *     text: string | null
 * }
 * const Todo2 = types.snapshotProcessor(Todo1, {
 *     // from snapshot to instance
 *     preProcessor(sn: BackendTodo) {
 *         return {
 *             text: sn.text || "";
 *         }
 *     },
 *     // from instance to snapshot
 *     postProcessor(sn): BackendTodo {
 *         return {
 *             text: !sn.text ? null : sn.text
 *         }
 *     }
 * })
 * ```
 *
 * @param type Type to run the processors over.
 * @param processors Processors to run.
 * @param name Type name, or undefined to inherit the inner type one.
 * @returns
 */
function snapshotProcessor(type, processors, name) {
    assertIsType(type, 1);
    if (devMode()) {
        if (processors.postProcessor && typeof processors.postProcessor !== "function") {
            // istanbul ignore next
            throw fail("postSnapshotProcessor must be a function");
        }
        if (processors.preProcessor && typeof processors.preProcessor !== "function") {
            // istanbul ignore next
            throw fail("preSnapshotProcessor must be a function");
        }
    }
    return new SnapshotProcessor(type, processors, name);
}

var needsIdentifierError = "Map.put can only be used to store complex values that have an identifier type attribute";
function tryCollectModelTypes(type, modelTypes) {
    var e_1, _a;
    var subtypes = type.getSubTypes();
    if (subtypes === cannotDetermineSubtype) {
        return false;
    }
    if (subtypes) {
        var subtypesArray = asArray(subtypes);
        try {
            for (var subtypesArray_1 = __values(subtypesArray), subtypesArray_1_1 = subtypesArray_1.next(); !subtypesArray_1_1.done; subtypesArray_1_1 = subtypesArray_1.next()) {
                var subtype = subtypesArray_1_1.value;
                if (!tryCollectModelTypes(subtype, modelTypes))
                    return false;
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (subtypesArray_1_1 && !subtypesArray_1_1.done && (_a = subtypesArray_1.return)) _a.call(subtypesArray_1);
            }
            finally { if (e_1) throw e_1.error; }
        }
    }
    if (type instanceof ModelType) {
        modelTypes.push(type);
    }
    return true;
}
/**
 * @internal
 * @hidden
 */
var MapIdentifierMode;
(function (MapIdentifierMode) {
    MapIdentifierMode[MapIdentifierMode["UNKNOWN"] = 0] = "UNKNOWN";
    MapIdentifierMode[MapIdentifierMode["YES"] = 1] = "YES";
    MapIdentifierMode[MapIdentifierMode["NO"] = 2] = "NO";
})(MapIdentifierMode || (MapIdentifierMode = {}));
var MSTMap = /** @class */ (function (_super) {
    __extends(MSTMap, _super);
    function MSTMap(initialData) {
        return _super.call(this, initialData, observable.ref.enhancer) || this;
    }
    MSTMap.prototype.get = function (key) {
        // maybe this is over-enthousiastic? normalize numeric keys to strings
        return _super.prototype.get.call(this, "" + key);
    };
    MSTMap.prototype.has = function (key) {
        return _super.prototype.has.call(this, "" + key);
    };
    MSTMap.prototype.delete = function (key) {
        return _super.prototype.delete.call(this, "" + key);
    };
    MSTMap.prototype.set = function (key, value) {
        return _super.prototype.set.call(this, "" + key, value);
    };
    MSTMap.prototype.put = function (value) {
        if (!value)
            throw fail$1("Map.put cannot be used to set empty values");
        if (isStateTreeNode(value)) {
            var node = getStateTreeNode(value);
            if (devMode()) {
                if (!node.identifierAttribute) {
                    throw fail$1(needsIdentifierError);
                }
            }
            if (node.identifier === null) {
                throw fail$1(needsIdentifierError);
            }
            this.set(node.identifier, value);
            return value;
        }
        else if (!isMutable(value)) {
            throw fail$1("Map.put can only be used to store complex values");
        }
        else {
            var mapNode = getStateTreeNode(this);
            var mapType = mapNode.type;
            if (mapType.identifierMode !== MapIdentifierMode.YES) {
                throw fail$1(needsIdentifierError);
            }
            var idAttr = mapType.mapIdentifierAttribute;
            var id = value[idAttr];
            if (!isValidIdentifier(id)) {
                // try again but this time after creating a node for the value
                // since it might be an optional identifier
                var newNode = this.put(mapType.getChildType().create(value, mapNode.environment));
                return this.put(getSnapshot(newNode));
            }
            var key = normalizeIdentifier(id);
            this.set(key, value);
            return this.get(key);
        }
    };
    return MSTMap;
}(ObservableMap));
/**
 * @internal
 * @hidden
 */
var MapType = /** @class */ (function (_super) {
    __extends(MapType, _super);
    function MapType(name, _subType, hookInitializers) {
        if (hookInitializers === void 0) { hookInitializers = []; }
        var _this = _super.call(this, name) || this;
        _this._subType = _subType;
        _this.identifierMode = MapIdentifierMode.UNKNOWN;
        _this.mapIdentifierAttribute = undefined;
        _this.flags = TypeFlags.Map;
        _this.hookInitializers = [];
        _this._determineIdentifierMode();
        _this.hookInitializers = hookInitializers;
        return _this;
    }
    MapType.prototype.hooks = function (hooks) {
        var hookInitializers = this.hookInitializers.length > 0 ? this.hookInitializers.concat(hooks) : [hooks];
        return new MapType(this.name, this._subType, hookInitializers);
    };
    MapType.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        this._determineIdentifierMode();
        return createObjectNode(this, parent, subpath, environment, initialValue);
    };
    MapType.prototype._determineIdentifierMode = function () {
        if (this.identifierMode !== MapIdentifierMode.UNKNOWN) {
            return;
        }
        var modelTypes = [];
        if (tryCollectModelTypes(this._subType, modelTypes)) {
            var identifierAttribute_1 = undefined;
            modelTypes.forEach(function (type) {
                if (type.identifierAttribute) {
                    if (identifierAttribute_1 && identifierAttribute_1 !== type.identifierAttribute) {
                        throw fail$1("The objects in a map should all have the same identifier attribute, expected '" + identifierAttribute_1 + "', but child of type '" + type.name + "' declared attribute '" + type.identifierAttribute + "' as identifier");
                    }
                    identifierAttribute_1 = type.identifierAttribute;
                }
            });
            if (identifierAttribute_1) {
                this.identifierMode = MapIdentifierMode.YES;
                this.mapIdentifierAttribute = identifierAttribute_1;
            }
            else {
                this.identifierMode = MapIdentifierMode.NO;
            }
        }
    };
    MapType.prototype.initializeChildNodes = function (objNode, initialSnapshot) {
        if (initialSnapshot === void 0) { initialSnapshot = {}; }
        var subType = objNode.type._subType;
        var result = {};
        Object.keys(initialSnapshot).forEach(function (name) {
            result[name] = subType.instantiate(objNode, name, undefined, initialSnapshot[name]);
        });
        return result;
    };
    MapType.prototype.createNewInstance = function (childNodes) {
        return new MSTMap(childNodes);
    };
    MapType.prototype.finalizeNewInstance = function (node, instance) {
        _interceptReads(instance, node.unbox);
        var type = node.type;
        type.hookInitializers.forEach(function (initializer) {
            var hooks = initializer(instance);
            Object.keys(hooks).forEach(function (name) {
                var hook = hooks[name];
                var actionInvoker = createActionInvoker(instance, name, hook);
                (!devMode() ? addHiddenFinalProp : addHiddenWritableProp)(instance, name, actionInvoker);
            });
        });
        intercept(instance, this.willChange);
        observe(instance, this.didChange);
    };
    MapType.prototype.describe = function () {
        return "Map<string, " + this._subType.describe() + ">";
    };
    MapType.prototype.getChildren = function (node) {
        // return (node.storedValue as ObservableMap<any>).values()
        return values(node.storedValue);
    };
    MapType.prototype.getChildNode = function (node, key) {
        var childNode = node.storedValue.get("" + key);
        if (!childNode)
            throw fail$1("Not a child " + key);
        return childNode;
    };
    MapType.prototype.willChange = function (change) {
        var node = getStateTreeNode(change.object);
        var key = change.name;
        node.assertWritable({ subpath: key });
        var mapType = node.type;
        var subType = mapType._subType;
        switch (change.type) {
            case "update":
                {
                    var newValue = change.newValue;
                    var oldValue = change.object.get(key);
                    if (newValue === oldValue)
                        return null;
                    typecheckInternal(subType, newValue);
                    change.newValue = subType.reconcile(node.getChildNode(key), change.newValue, node, key);
                    mapType.processIdentifier(key, change.newValue);
                }
                break;
            case "add":
                {
                    typecheckInternal(subType, change.newValue);
                    change.newValue = subType.instantiate(node, key, undefined, change.newValue);
                    mapType.processIdentifier(key, change.newValue);
                }
                break;
        }
        return change;
    };
    MapType.prototype.processIdentifier = function (expected, node) {
        if (this.identifierMode === MapIdentifierMode.YES && node instanceof ObjectNode) {
            var identifier = node.identifier;
            if (identifier !== expected)
                throw fail$1("A map of objects containing an identifier should always store the object under their own identifier. Trying to store key '" + identifier + "', but expected: '" + expected + "'");
        }
    };
    MapType.prototype.getSnapshot = function (node) {
        var res = {};
        node.getChildren().forEach(function (childNode) {
            res[childNode.subpath] = childNode.snapshot;
        });
        return res;
    };
    MapType.prototype.processInitialSnapshot = function (childNodes) {
        var processed = {};
        Object.keys(childNodes).forEach(function (key) {
            processed[key] = childNodes[key].getSnapshot();
        });
        return processed;
    };
    MapType.prototype.didChange = function (change) {
        var node = getStateTreeNode(change.object);
        switch (change.type) {
            case "update":
                return void node.emitPatch({
                    op: "replace",
                    path: escapeJsonPath(change.name),
                    value: change.newValue.snapshot,
                    oldValue: change.oldValue ? change.oldValue.snapshot : undefined
                }, node);
            case "add":
                return void node.emitPatch({
                    op: "add",
                    path: escapeJsonPath(change.name),
                    value: change.newValue.snapshot,
                    oldValue: undefined
                }, node);
            case "delete":
                // a node got deleted, get the old snapshot and make the node die
                var oldSnapshot = change.oldValue.snapshot;
                change.oldValue.die();
                // emit the patch
                return void node.emitPatch({
                    op: "remove",
                    path: escapeJsonPath(change.name),
                    oldValue: oldSnapshot
                }, node);
        }
    };
    MapType.prototype.applyPatchLocally = function (node, subpath, patch) {
        var target = node.storedValue;
        switch (patch.op) {
            case "add":
            case "replace":
                target.set(subpath, patch.value);
                break;
            case "remove":
                target.delete(subpath);
                break;
        }
    };
    MapType.prototype.applySnapshot = function (node, snapshot) {
        typecheckInternal(this, snapshot);
        var target = node.storedValue;
        var currentKeys = {};
        Array.from(target.keys()).forEach(function (key) {
            currentKeys[key] = false;
        });
        if (snapshot) {
            // Don't use target.replace, as it will throw away all existing items first
            for (var key in snapshot) {
                target.set(key, snapshot[key]);
                currentKeys["" + key] = true;
            }
        }
        Object.keys(currentKeys).forEach(function (key) {
            if (currentKeys[key] === false)
                target.delete(key);
        });
    };
    MapType.prototype.getChildType = function () {
        return this._subType;
    };
    MapType.prototype.isValidSnapshot = function (value, context) {
        var _this = this;
        if (!isPlainObject(value)) {
            return typeCheckFailure(context, value, "Value is not a plain object");
        }
        return flattenTypeErrors(Object.keys(value).map(function (path) {
            return _this._subType.validate(value[path], getContextForPath(context, path, _this._subType));
        }));
    };
    MapType.prototype.getDefaultSnapshot = function () {
        return EMPTY_OBJECT;
    };
    MapType.prototype.removeChild = function (node, subpath) {
        node.storedValue.delete(subpath);
    };
    __decorate([
        action
    ], MapType.prototype, "applySnapshot", null);
    return MapType;
}(ComplexType));
/**
 * `types.map` - Creates a key based collection type who's children are all of a uniform declared type.
 * If the type stored in a map has an identifier, it is mandatory to store the child under that identifier in the map.
 *
 * This type will always produce [observable maps](https://mobx.js.org/refguide/map.html)
 *
 * Example:
 * ```ts
 * const Todo = types.model({
 *   id: types.identifier,
 *   task: types.string
 * })
 *
 * const TodoStore = types.model({
 *   todos: types.map(Todo)
 * })
 *
 * const s = TodoStore.create({ todos: {} })
 * unprotect(s)
 * s.todos.set(17, { task: "Grab coffee", id: 17 })
 * s.todos.put({ task: "Grab cookie", id: 18 }) // put will infer key from the identifier
 * console.log(s.todos.get(17).task) // prints: "Grab coffee"
 * ```
 *
 * @param subtype
 * @returns
 */
function map(subtype) {
    return new MapType("map<string, " + subtype.name + ">", subtype);
}
/**
 * Returns if a given value represents a map type.
 *
 * @param type
 * @returns `true` if it is a map type.
 */
function isMapType(type) {
    return isType(type) && (type.flags & TypeFlags.Map) > 0;
}

/**
 * @internal
 * @hidden
 */
var ArrayType = /** @class */ (function (_super) {
    __extends(ArrayType, _super);
    function ArrayType(name, _subType, hookInitializers) {
        if (hookInitializers === void 0) { hookInitializers = []; }
        var _this = _super.call(this, name) || this;
        _this._subType = _subType;
        _this.flags = TypeFlags.Array;
        _this.hookInitializers = [];
        _this.hookInitializers = hookInitializers;
        return _this;
    }
    ArrayType.prototype.hooks = function (hooks) {
        var hookInitializers = this.hookInitializers.length > 0 ? this.hookInitializers.concat(hooks) : [hooks];
        return new ArrayType(this.name, this._subType, hookInitializers);
    };
    ArrayType.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        return createObjectNode(this, parent, subpath, environment, initialValue);
    };
    ArrayType.prototype.initializeChildNodes = function (objNode, snapshot) {
        if (snapshot === void 0) { snapshot = []; }
        var subType = objNode.type._subType;
        var result = {};
        snapshot.forEach(function (item, index) {
            var subpath = "" + index;
            result[subpath] = subType.instantiate(objNode, subpath, undefined, item);
        });
        return result;
    };
    ArrayType.prototype.createNewInstance = function (childNodes) {
        return observable.array(convertChildNodesToArray(childNodes), mobxShallow);
    };
    ArrayType.prototype.finalizeNewInstance = function (node, instance) {
        _getAdministration(instance).dehancer = node.unbox;
        var type = node.type;
        type.hookInitializers.forEach(function (initializer) {
            var hooks = initializer(instance);
            Object.keys(hooks).forEach(function (name) {
                var hook = hooks[name];
                var actionInvoker = createActionInvoker(instance, name, hook);
                (!devMode() ? addHiddenFinalProp : addHiddenWritableProp)(instance, name, actionInvoker);
            });
        });
        intercept(instance, this.willChange);
        observe(instance, this.didChange);
    };
    ArrayType.prototype.describe = function () {
        return this._subType.describe() + "[]";
    };
    ArrayType.prototype.getChildren = function (node) {
        return node.storedValue.slice();
    };
    ArrayType.prototype.getChildNode = function (node, key) {
        var index = Number(key);
        if (index < node.storedValue.length)
            return node.storedValue[index];
        throw fail$1("Not a child: " + key);
    };
    ArrayType.prototype.willChange = function (change) {
        var node = getStateTreeNode(change.object);
        node.assertWritable({ subpath: "" + change.index });
        var subType = node.type._subType;
        var childNodes = node.getChildren();
        switch (change.type) {
            case "update":
                {
                    if (change.newValue === change.object[change.index])
                        return null;
                    var updatedNodes = reconcileArrayChildren(node, subType, [childNodes[change.index]], [change.newValue], [change.index]);
                    if (!updatedNodes) {
                        return null;
                    }
                    change.newValue = updatedNodes[0];
                }
                break;
            case "splice":
                {
                    var index_1 = change.index, removedCount = change.removedCount, added = change.added;
                    var addedNodes = reconcileArrayChildren(node, subType, childNodes.slice(index_1, index_1 + removedCount), added, added.map(function (_, i) { return index_1 + i; }));
                    if (!addedNodes) {
                        return null;
                    }
                    change.added = addedNodes;
                    // update paths of remaining items
                    for (var i = index_1 + removedCount; i < childNodes.length; i++) {
                        childNodes[i].setParent(node, "" + (i + added.length - removedCount));
                    }
                }
                break;
        }
        return change;
    };
    ArrayType.prototype.getSnapshot = function (node) {
        return node.getChildren().map(function (childNode) { return childNode.snapshot; });
    };
    ArrayType.prototype.processInitialSnapshot = function (childNodes) {
        var processed = [];
        Object.keys(childNodes).forEach(function (key) {
            processed.push(childNodes[key].getSnapshot());
        });
        return processed;
    };
    ArrayType.prototype.didChange = function (change) {
        var node = getStateTreeNode(change.object);
        switch (change.type) {
            case "update":
                return void node.emitPatch({
                    op: "replace",
                    path: "" + change.index,
                    value: change.newValue.snapshot,
                    oldValue: change.oldValue ? change.oldValue.snapshot : undefined
                }, node);
            case "splice":
                for (var i = change.removedCount - 1; i >= 0; i--)
                    node.emitPatch({
                        op: "remove",
                        path: "" + (change.index + i),
                        oldValue: change.removed[i].snapshot
                    }, node);
                for (var i = 0; i < change.addedCount; i++)
                    node.emitPatch({
                        op: "add",
                        path: "" + (change.index + i),
                        value: node.getChildNode("" + (change.index + i)).snapshot,
                        oldValue: undefined
                    }, node);
                return;
        }
    };
    ArrayType.prototype.applyPatchLocally = function (node, subpath, patch) {
        var target = node.storedValue;
        var index = subpath === "-" ? target.length : Number(subpath);
        switch (patch.op) {
            case "replace":
                target[index] = patch.value;
                break;
            case "add":
                target.splice(index, 0, patch.value);
                break;
            case "remove":
                target.splice(index, 1);
                break;
        }
    };
    ArrayType.prototype.applySnapshot = function (node, snapshot) {
        typecheckInternal(this, snapshot);
        var target = node.storedValue;
        target.replace(snapshot);
    };
    ArrayType.prototype.getChildType = function () {
        return this._subType;
    };
    ArrayType.prototype.isValidSnapshot = function (value, context) {
        var _this = this;
        if (!isArray(value)) {
            return typeCheckFailure(context, value, "Value is not an array");
        }
        return flattenTypeErrors(value.map(function (item, index) {
            return _this._subType.validate(item, getContextForPath(context, "" + index, _this._subType));
        }));
    };
    ArrayType.prototype.getDefaultSnapshot = function () {
        return EMPTY_ARRAY;
    };
    ArrayType.prototype.removeChild = function (node, subpath) {
        node.storedValue.splice(Number(subpath), 1);
    };
    __decorate([
        action
    ], ArrayType.prototype, "applySnapshot", null);
    return ArrayType;
}(ComplexType));
/**
 * `types.array` - Creates an index based collection type who's children are all of a uniform declared type.
 *
 * This type will always produce [observable arrays](https://mobx.js.org/refguide/array.html)
 *
 * Example:
 * ```ts
 * const Todo = types.model({
 *   task: types.string
 * })
 *
 * const TodoStore = types.model({
 *   todos: types.array(Todo)
 * })
 *
 * const s = TodoStore.create({ todos: [] })
 * unprotect(s) // needed to allow modifying outside of an action
 * s.todos.push({ task: "Grab coffee" })
 * console.log(s.todos[0]) // prints: "Grab coffee"
 * ```
 *
 * @param subtype
 * @returns
 */
function array(subtype) {
    assertIsType(subtype, 1);
    return new ArrayType(subtype.name + "[]", subtype);
}
function reconcileArrayChildren(parent, childType, oldNodes, newValues, newPaths) {
    var nothingChanged = true;
    for (var i = 0;; i++) {
        var hasNewNode = i <= newValues.length - 1;
        var oldNode = oldNodes[i];
        var newValue = hasNewNode ? newValues[i] : undefined;
        var newPath = "" + newPaths[i];
        // for some reason, instead of newValue we got a node, fallback to the storedValue
        // TODO: https://github.com/mobxjs/mobx-state-tree/issues/340#issuecomment-325581681
        if (isNode(newValue))
            newValue = newValue.storedValue;
        if (!oldNode && !hasNewNode) {
            // both are empty, end
            break;
        }
        else if (!hasNewNode) {
            // new one does not exists
            nothingChanged = false;
            oldNodes.splice(i, 1);
            if (oldNode instanceof ObjectNode) {
                // since it is going to be returned by pop/splice/shift better create it before killing it
                // so it doesn't end up in an undead state
                oldNode.createObservableInstanceIfNeeded();
            }
            oldNode.die();
            i--;
        }
        else if (!oldNode) {
            // there is no old node, create it
            // check if already belongs to the same parent. if so, avoid pushing item in. only swapping can occur.
            if (isStateTreeNode(newValue) && getStateTreeNode(newValue).parent === parent) {
                // this node is owned by this parent, but not in the reconcilable set, so it must be double
                throw fail$1("Cannot add an object to a state tree if it is already part of the same or another state tree. Tried to assign an object to '" + parent.path + "/" + newPath + "', but it lives already at '" + getStateTreeNode(newValue).path + "'");
            }
            nothingChanged = false;
            var newNode = valueAsNode(childType, parent, newPath, newValue);
            oldNodes.splice(i, 0, newNode);
        }
        else if (areSame(oldNode, newValue)) {
            // both are the same, reconcile
            oldNodes[i] = valueAsNode(childType, parent, newPath, newValue, oldNode);
        }
        else {
            // nothing to do, try to reorder
            var oldMatch = undefined;
            // find a possible candidate to reuse
            for (var j = i; j < oldNodes.length; j++) {
                if (areSame(oldNodes[j], newValue)) {
                    oldMatch = oldNodes.splice(j, 1)[0];
                    break;
                }
            }
            nothingChanged = false;
            var newNode = valueAsNode(childType, parent, newPath, newValue, oldMatch);
            oldNodes.splice(i, 0, newNode);
        }
    }
    return nothingChanged ? null : oldNodes;
}
/**
 * Convert a value to a node at given parent and subpath. Attempts to reuse old node if possible and given.
 */
function valueAsNode(childType, parent, subpath, newValue, oldNode) {
    // ensure the value is valid-ish
    typecheckInternal(childType, newValue);
    function getNewNode() {
        // the new value has a MST node
        if (isStateTreeNode(newValue)) {
            var childNode = getStateTreeNode(newValue);
            childNode.assertAlive(EMPTY_OBJECT);
            // the node lives here
            if (childNode.parent !== null && childNode.parent === parent) {
                childNode.setParent(parent, subpath);
                return childNode;
            }
        }
        // there is old node and new one is a value/snapshot
        if (oldNode) {
            return childType.reconcile(oldNode, newValue, parent, subpath);
        }
        // nothing to do, create from scratch
        return childType.instantiate(parent, subpath, undefined, newValue);
    }
    var newNode = getNewNode();
    if (oldNode && oldNode !== newNode) {
        if (oldNode instanceof ObjectNode) {
            // since it is going to be returned by pop/splice/shift better create it before killing it
            // so it doesn't end up in an undead state
            oldNode.createObservableInstanceIfNeeded();
        }
        oldNode.die();
    }
    return newNode;
}
/**
 * Check if a node holds a value.
 */
function areSame(oldNode, newValue) {
    // never consider dead old nodes for reconciliation
    if (!oldNode.isAlive) {
        return false;
    }
    // the new value has the same node
    if (isStateTreeNode(newValue)) {
        var newNode = getStateTreeNode(newValue);
        return newNode.isAlive && newNode === oldNode;
    }
    // the provided value is the snapshot of the old node
    if (oldNode.snapshot === newValue) {
        return true;
    }
    // new value is a snapshot with the correct identifier
    return (oldNode instanceof ObjectNode &&
        oldNode.identifier !== null &&
        oldNode.identifierAttribute &&
        isPlainObject(newValue) &&
        oldNode.identifier === normalizeIdentifier(newValue[oldNode.identifierAttribute]) &&
        oldNode.type.is(newValue));
}
/**
 * Returns if a given value represents an array type.
 *
 * @param type
 * @returns `true` if the type is an array type.
 */
function isArrayType(type) {
    return isType(type) && (type.flags & TypeFlags.Array) > 0;
}

var PRE_PROCESS_SNAPSHOT = "preProcessSnapshot";
var POST_PROCESS_SNAPSHOT = "postProcessSnapshot";
function objectTypeToString() {
    return getStateTreeNode(this).toString();
}
var defaultObjectOptions = {
    name: "AnonymousModel",
    properties: {},
    initializers: EMPTY_ARRAY
};
function toPropertiesObject(declaredProps) {
    // loop through properties and ensures that all items are types
    return Object.keys(declaredProps).reduce(function (props, key) {
        var _a, _b, _c;
        // warn if user intended a HOOK
        if (key in Hook)
            throw fail$1("Hook '" + key + "' was defined as property. Hooks should be defined as part of the actions");
        // the user intended to use a view
        var descriptor = Object.getOwnPropertyDescriptor(props, key);
        if ("get" in descriptor) {
            throw fail$1("Getters are not supported as properties. Please use views instead");
        }
        // undefined and null are not valid
        var value = descriptor.value;
        if (value === null || value === undefined) {
            throw fail$1("The default value of an attribute cannot be null or undefined as the type cannot be inferred. Did you mean `types.maybe(someType)`?");
            // its a primitive, convert to its type
        }
        else if (isPrimitive(value)) {
            return Object.assign({}, props, (_a = {},
                _a[key] = optional(getPrimitiveFactoryFromValue(value), value),
                _a));
            // map defaults to empty object automatically for models
        }
        else if (value instanceof MapType) {
            return Object.assign({}, props, (_b = {},
                _b[key] = optional(value, {}),
                _b));
        }
        else if (value instanceof ArrayType) {
            return Object.assign({}, props, (_c = {}, _c[key] = optional(value, []), _c));
            // its already a type
        }
        else if (isType(value)) {
            return props;
            // its a function, maybe the user wanted a view?
        }
        else if (devMode() && typeof value === "function") {
            throw fail$1("Invalid type definition for property '" + key + "', it looks like you passed a function. Did you forget to invoke it, or did you intend to declare a view / action?");
            // no other complex values
        }
        else if (devMode() && typeof value === "object") {
            throw fail$1("Invalid type definition for property '" + key + "', it looks like you passed an object. Try passing another model type or a types.frozen.");
            // WTF did you pass in mate?
        }
        else {
            throw fail$1("Invalid type definition for property '" + key + "', cannot infer a type from a value like '" + value + "' (" + typeof value + ")");
        }
    }, declaredProps);
}
/**
 * @internal
 * @hidden
 */
var ModelType = /** @class */ (function (_super) {
    __extends(ModelType, _super);
    function ModelType(opts) {
        var _this = _super.call(this, opts.name || defaultObjectOptions.name) || this;
        _this.flags = TypeFlags.Object;
        _this.named = function (name) {
            return _this.cloneAndEnhance({ name: name });
        };
        _this.props = function (properties) {
            return _this.cloneAndEnhance({ properties: properties });
        };
        _this.preProcessSnapshot = function (preProcessor) {
            var currentPreprocessor = _this.preProcessor;
            if (!currentPreprocessor)
                return _this.cloneAndEnhance({ preProcessor: preProcessor });
            else
                return _this.cloneAndEnhance({
                    preProcessor: function (snapshot) { return currentPreprocessor(preProcessor(snapshot)); }
                });
        };
        _this.postProcessSnapshot = function (postProcessor) {
            var currentPostprocessor = _this.postProcessor;
            if (!currentPostprocessor)
                return _this.cloneAndEnhance({ postProcessor: postProcessor });
            else
                return _this.cloneAndEnhance({
                    postProcessor: function (snapshot) { return postProcessor(currentPostprocessor(snapshot)); }
                });
        };
        Object.assign(_this, defaultObjectOptions, opts);
        // ensures that any default value gets converted to its related type
        _this.properties = toPropertiesObject(_this.properties);
        freeze(_this.properties); // make sure nobody messes with it
        _this.propertyNames = Object.keys(_this.properties);
        _this.identifierAttribute = _this._getIdentifierAttribute();
        return _this;
    }
    ModelType.prototype._getIdentifierAttribute = function () {
        var identifierAttribute = undefined;
        this.forAllProps(function (propName, propType) {
            if (propType.flags & TypeFlags.Identifier) {
                if (identifierAttribute)
                    throw fail$1("Cannot define property '" + propName + "' as object identifier, property '" + identifierAttribute + "' is already defined as identifier property");
                identifierAttribute = propName;
            }
        });
        return identifierAttribute;
    };
    ModelType.prototype.cloneAndEnhance = function (opts) {
        return new ModelType({
            name: opts.name || this.name,
            properties: Object.assign({}, this.properties, opts.properties),
            initializers: this.initializers.concat(opts.initializers || []),
            preProcessor: opts.preProcessor || this.preProcessor,
            postProcessor: opts.postProcessor || this.postProcessor
        });
    };
    ModelType.prototype.actions = function (fn) {
        var _this = this;
        var actionInitializer = function (self) {
            _this.instantiateActions(self, fn(self));
            return self;
        };
        return this.cloneAndEnhance({ initializers: [actionInitializer] });
    };
    ModelType.prototype.instantiateActions = function (self, actions) {
        // check if return is correct
        if (!isPlainObject(actions))
            throw fail$1("actions initializer should return a plain object containing actions");
        // bind actions to the object created
        Object.keys(actions).forEach(function (name) {
            // warn if preprocessor was given
            if (name === PRE_PROCESS_SNAPSHOT)
                throw fail$1("Cannot define action '" + PRE_PROCESS_SNAPSHOT + "', it should be defined using 'type.preProcessSnapshot(fn)' instead");
            // warn if postprocessor was given
            if (name === POST_PROCESS_SNAPSHOT)
                throw fail$1("Cannot define action '" + POST_PROCESS_SNAPSHOT + "', it should be defined using 'type.postProcessSnapshot(fn)' instead");
            var action2 = actions[name];
            // apply hook composition
            var baseAction = self[name];
            if (name in Hook && baseAction) {
                var specializedAction_1 = action2;
                action2 = function () {
                    baseAction.apply(null, arguments);
                    specializedAction_1.apply(null, arguments);
                };
            }
            // the goal of this is to make sure actions using "this" can call themselves,
            // while still allowing the middlewares to register them
            var middlewares = action2.$mst_middleware; // make sure middlewares are not lost
            var boundAction = action2.bind(actions);
            boundAction.$mst_middleware = middlewares;
            var actionInvoker = createActionInvoker(self, name, boundAction);
            actions[name] = actionInvoker;
            (!devMode() ? addHiddenFinalProp : addHiddenWritableProp)(self, name, actionInvoker);
        });
    };
    ModelType.prototype.volatile = function (fn) {
        var _this = this;
        var stateInitializer = function (self) {
            _this.instantiateVolatileState(self, fn(self));
            return self;
        };
        return this.cloneAndEnhance({ initializers: [stateInitializer] });
    };
    ModelType.prototype.instantiateVolatileState = function (self, state) {
        // check views return
        if (!isPlainObject(state))
            throw fail$1("volatile state initializer should return a plain object containing state");
        set(self, state);
    };
    ModelType.prototype.extend = function (fn) {
        var _this = this;
        var initializer = function (self) {
            var _a = fn(self), actions = _a.actions, views = _a.views, state = _a.state, rest = __rest(_a, ["actions", "views", "state"]);
            for (var key in rest)
                throw fail$1("The `extend` function should return an object with a subset of the fields 'actions', 'views' and 'state'. Found invalid key '" + key + "'");
            if (state)
                _this.instantiateVolatileState(self, state);
            if (views)
                _this.instantiateViews(self, views);
            if (actions)
                _this.instantiateActions(self, actions);
            return self;
        };
        return this.cloneAndEnhance({ initializers: [initializer] });
    };
    ModelType.prototype.views = function (fn) {
        var _this = this;
        var viewInitializer = function (self) {
            _this.instantiateViews(self, fn(self));
            return self;
        };
        return this.cloneAndEnhance({ initializers: [viewInitializer] });
    };
    ModelType.prototype.instantiateViews = function (self, views) {
        // check views return
        if (!isPlainObject(views))
            throw fail$1("views initializer should return a plain object containing views");
        Object.keys(views).forEach(function (key) {
            // is this a computed property?
            var descriptor = Object.getOwnPropertyDescriptor(views, key);
            if ("get" in descriptor) {
                if (isComputedProp(self, key)) {
                    var computedValue = _getAdministration(self, key);
                    // TODO: mobx currently does not allow redefining computes yet, pending #1121
                    // FIXME: this binds to the internals of mobx!
                    computedValue.derivation = descriptor.get;
                    computedValue.scope = self;
                    if (descriptor.set)
                        computedValue.setter = action(computedValue.name + "-setter", descriptor.set);
                }
                else {
                    computed(self, key, descriptor, true);
                }
            }
            else if (typeof descriptor.value === "function") {
                (!devMode() ? addHiddenFinalProp : addHiddenWritableProp)(self, key, descriptor.value);
            }
            else {
                throw fail$1("A view member should either be a function or getter based property");
            }
        });
    };
    ModelType.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        var value = isStateTreeNode(initialValue)
            ? initialValue
            : this.applySnapshotPreProcessor(initialValue);
        return createObjectNode(this, parent, subpath, environment, value);
        // Optimization: record all prop- view- and action names after first construction, and generate an optimal base class
        // that pre-reserves all these fields for fast object-member lookups
    };
    ModelType.prototype.initializeChildNodes = function (objNode, initialSnapshot) {
        if (initialSnapshot === void 0) { initialSnapshot = {}; }
        var type = objNode.type;
        var result = {};
        type.forAllProps(function (name, childType) {
            result[name] = childType.instantiate(objNode, name, undefined, initialSnapshot[name]);
        });
        return result;
    };
    ModelType.prototype.createNewInstance = function (childNodes) {
        return observable.object(childNodes, EMPTY_OBJECT, mobxShallow);
    };
    ModelType.prototype.finalizeNewInstance = function (node, instance) {
        addHiddenFinalProp(instance, "toString", objectTypeToString);
        this.forAllProps(function (name) {
            _interceptReads(instance, name, node.unbox);
        });
        this.initializers.reduce(function (self, fn) { return fn(self); }, instance);
        intercept(instance, this.willChange);
        observe(instance, this.didChange);
    };
    ModelType.prototype.willChange = function (chg) {
        // TODO: mobx typings don't seem to take into account that newValue can be set even when removing a prop
        var change = chg;
        var node = getStateTreeNode(change.object);
        var subpath = change.name;
        node.assertWritable({ subpath: subpath });
        var childType = node.type.properties[subpath];
        // only properties are typed, state are stored as-is references
        if (childType) {
            typecheckInternal(childType, change.newValue);
            change.newValue = childType.reconcile(node.getChildNode(subpath), change.newValue, node, subpath);
        }
        return change;
    };
    ModelType.prototype.didChange = function (chg) {
        // TODO: mobx typings don't seem to take into account that newValue can be set even when removing a prop
        var change = chg;
        var childNode = getStateTreeNode(change.object);
        var childType = childNode.type.properties[change.name];
        if (!childType) {
            // don't emit patches for volatile state
            return;
        }
        var oldChildValue = change.oldValue ? change.oldValue.snapshot : undefined;
        childNode.emitPatch({
            op: "replace",
            path: escapeJsonPath(change.name),
            value: change.newValue.snapshot,
            oldValue: oldChildValue
        }, childNode);
    };
    ModelType.prototype.getChildren = function (node) {
        var _this = this;
        var res = [];
        this.forAllProps(function (name) {
            res.push(_this.getChildNode(node, name));
        });
        return res;
    };
    ModelType.prototype.getChildNode = function (node, key) {
        if (!(key in this.properties))
            throw fail$1("Not a value property: " + key);
        var childNode = _getAdministration(node.storedValue, key).value; // TODO: blegh!
        if (!childNode)
            throw fail$1("Node not available for property " + key);
        return childNode;
    };
    ModelType.prototype.getSnapshot = function (node, applyPostProcess) {
        var _this = this;
        if (applyPostProcess === void 0) { applyPostProcess = true; }
        var res = {};
        this.forAllProps(function (name, type) {
            getAtom(node.storedValue, name).reportObserved();
            res[name] = _this.getChildNode(node, name).snapshot;
        });
        if (applyPostProcess) {
            return this.applySnapshotPostProcessor(res);
        }
        return res;
    };
    ModelType.prototype.processInitialSnapshot = function (childNodes) {
        var processed = {};
        Object.keys(childNodes).forEach(function (key) {
            processed[key] = childNodes[key].getSnapshot();
        });
        return this.applySnapshotPostProcessor(processed);
    };
    ModelType.prototype.applyPatchLocally = function (node, subpath, patch) {
        if (!(patch.op === "replace" || patch.op === "add")) {
            throw fail$1("object does not support operation " + patch.op);
        }
        node.storedValue[subpath] = patch.value;
    };
    ModelType.prototype.applySnapshot = function (node, snapshot) {
        var preProcessedSnapshot = this.applySnapshotPreProcessor(snapshot);
        typecheckInternal(this, preProcessedSnapshot);
        this.forAllProps(function (name) {
            node.storedValue[name] = preProcessedSnapshot[name];
        });
    };
    ModelType.prototype.applySnapshotPreProcessor = function (snapshot) {
        var processor = this.preProcessor;
        return processor ? processor.call(null, snapshot) : snapshot;
    };
    ModelType.prototype.applySnapshotPostProcessor = function (snapshot) {
        var postProcessor = this.postProcessor;
        if (postProcessor)
            return postProcessor.call(null, snapshot);
        return snapshot;
    };
    ModelType.prototype.getChildType = function (propertyName) {
        assertIsString(propertyName, 1);
        return this.properties[propertyName];
    };
    ModelType.prototype.isValidSnapshot = function (value, context) {
        var _this = this;
        var snapshot = this.applySnapshotPreProcessor(value);
        if (!isPlainObject(snapshot)) {
            return typeCheckFailure(context, snapshot, "Value is not a plain object");
        }
        return flattenTypeErrors(this.propertyNames.map(function (key) {
            return _this.properties[key].validate(snapshot[key], getContextForPath(context, key, _this.properties[key]));
        }));
    };
    ModelType.prototype.forAllProps = function (fn) {
        var _this = this;
        this.propertyNames.forEach(function (key) { return fn(key, _this.properties[key]); });
    };
    ModelType.prototype.describe = function () {
        var _this = this;
        // optimization: cache
        return ("{ " +
            this.propertyNames.map(function (key) { return key + ": " + _this.properties[key].describe(); }).join("; ") +
            " }");
    };
    ModelType.prototype.getDefaultSnapshot = function () {
        return EMPTY_OBJECT;
    };
    ModelType.prototype.removeChild = function (node, subpath) {
        node.storedValue[subpath] = undefined;
    };
    __decorate([
        action
    ], ModelType.prototype, "applySnapshot", null);
    return ModelType;
}(ComplexType));
/**
 * `types.model` - Creates a new model type by providing a name, properties, volatile state and actions.
 *
 * See the [model type](https://github.com/mobxjs/mobx-state-tree#creating-models) description or the [getting started](https://github.com/mobxjs/mobx-state-tree/blob/master/docs/getting-started.md#getting-started-1) tutorial.
 */
function model() {
    var args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        args[_i] = arguments[_i];
    }
    var name = typeof args[0] === "string" ? args.shift() : "AnonymousModel";
    var properties = args.shift() || {};
    return new ModelType({ name: name, properties: properties });
}
/**
 * `types.compose` - Composes a new model from one or more existing model types.
 * This method can be invoked in two forms:
 * Given 2 or more model types, the types are composed into a new Type.
 * Given first parameter as a string and 2 or more model types,
 * the types are composed into a new Type with the given name
 */
function compose() {
    var args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        args[_i] = arguments[_i];
    }
    // TODO: just join the base type names if no name is provided
    var hasTypename = typeof args[0] === "string";
    var typeName = hasTypename ? args[0] : "AnonymousModel";
    if (hasTypename) {
        args.shift();
    }
    // check all parameters
    if (devMode()) {
        args.forEach(function (type, i) {
            assertArg(type, isModelType, "mobx-state-tree model type", hasTypename ? i + 2 : i + 1);
        });
    }
    return args
        .reduce(function (prev, cur) {
        return prev.cloneAndEnhance({
            name: prev.name + "_" + cur.name,
            properties: cur.properties,
            initializers: cur.initializers,
            preProcessor: function (snapshot) {
                return cur.applySnapshotPreProcessor(prev.applySnapshotPreProcessor(snapshot));
            },
            postProcessor: function (snapshot) {
                return cur.applySnapshotPostProcessor(prev.applySnapshotPostProcessor(snapshot));
            }
        });
    })
        .named(typeName);
}
/**
 * Returns if a given value represents a model type.
 *
 * @param type
 * @returns
 */
function isModelType(type) {
    return isType(type) && (type.flags & TypeFlags.Object) > 0;
}

// TODO: implement CoreType using types.custom ?
/**
 * @internal
 * @hidden
 */
var CoreType = /** @class */ (function (_super) {
    __extends(CoreType, _super);
    function CoreType(name, flags, checker, initializer) {
        if (initializer === void 0) { initializer = identity; }
        var _this = _super.call(this, name) || this;
        _this.flags = flags;
        _this.checker = checker;
        _this.initializer = initializer;
        _this.flags = flags;
        return _this;
    }
    CoreType.prototype.describe = function () {
        return this.name;
    };
    CoreType.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        return createScalarNode(this, parent, subpath, environment, initialValue);
    };
    CoreType.prototype.createNewInstance = function (snapshot) {
        return this.initializer(snapshot);
    };
    CoreType.prototype.isValidSnapshot = function (value, context) {
        if (isPrimitive(value) && this.checker(value)) {
            return typeCheckSuccess();
        }
        var typeName = this.name === "Date" ? "Date or a unix milliseconds timestamp" : this.name;
        return typeCheckFailure(context, value, "Value is not a " + typeName);
    };
    return CoreType;
}(SimpleType));
/**
 * `types.string` - Creates a type that can only contain a string value.
 * This type is used for string values by default
 *
 * Example:
 * ```ts
 * const Person = types.model({
 *   firstName: types.string,
 *   lastName: "Doe"
 * })
 * ```
 */
// tslint:disable-next-line:variable-name
var string = new CoreType("string", TypeFlags.String, function (v) { return typeof v === "string"; });
/**
 * `types.number` - Creates a type that can only contain a numeric value.
 * This type is used for numeric values by default
 *
 * Example:
 * ```ts
 * const Vector = types.model({
 *   x: types.number,
 *   y: 1.5
 * })
 * ```
 */
// tslint:disable-next-line:variable-name
var number = new CoreType("number", TypeFlags.Number, function (v) { return typeof v === "number"; });
/**
 * `types.integer` - Creates a type that can only contain an integer value.
 * This type is used for integer values by default
 *
 * Example:
 * ```ts
 * const Size = types.model({
 *   width: types.integer,
 *   height: 10
 * })
 * ```
 */
// tslint:disable-next-line:variable-name
var integer = new CoreType("integer", TypeFlags.Integer, function (v) { return isInteger(v); });
/**
 * `types.boolean` - Creates a type that can only contain a boolean value.
 * This type is used for boolean values by default
 *
 * Example:
 * ```ts
 * const Thing = types.model({
 *   isCool: types.boolean,
 *   isAwesome: false
 * })
 * ```
 */
// tslint:disable-next-line:variable-name
var boolean = new CoreType("boolean", TypeFlags.Boolean, function (v) { return typeof v === "boolean"; });
/**
 * `types.null` - The type of the value `null`
 */
var nullType = new CoreType("null", TypeFlags.Null, function (v) { return v === null; });
/**
 * `types.undefined` - The type of the value `undefined`
 */
var undefinedType = new CoreType("undefined", TypeFlags.Undefined, function (v) { return v === undefined; });
var _DatePrimitive = new CoreType("Date", TypeFlags.Date, function (v) { return typeof v === "number" || v instanceof Date; }, function (v) { return (v instanceof Date ? v : new Date(v)); });
_DatePrimitive.getSnapshot = function (node) {
    return node.storedValue.getTime();
};
/**
 * `types.Date` - Creates a type that can only contain a javascript Date value.
 *
 * Example:
 * ```ts
 * const LogLine = types.model({
 *   timestamp: types.Date,
 * })
 *
 * LogLine.create({ timestamp: new Date() })
 * ```
 */
var DatePrimitive = _DatePrimitive;
/**
 * @internal
 * @hidden
 */
function getPrimitiveFactoryFromValue(value) {
    switch (typeof value) {
        case "string":
            return string;
        case "number":
            return number; // In the future, isInteger(value) ? integer : number would be interesting, but would be too breaking for now
        case "boolean":
            return boolean;
        case "object":
            if (value instanceof Date)
                return DatePrimitive;
    }
    throw fail$1("Cannot determine primitive type from value " + value);
}
/**
 * Returns if a given value represents a primitive type.
 *
 * @param type
 * @returns
 */
function isPrimitiveType(type) {
    return (isType(type) &&
        (type.flags &
            (TypeFlags.String |
                TypeFlags.Number |
                TypeFlags.Integer |
                TypeFlags.Boolean |
                TypeFlags.Date)) >
            0);
}

/**
 * @internal
 * @hidden
 */
var Literal = /** @class */ (function (_super) {
    __extends(Literal, _super);
    function Literal(value) {
        var _this = _super.call(this, JSON.stringify(value)) || this;
        _this.flags = TypeFlags.Literal;
        _this.value = value;
        return _this;
    }
    Literal.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        return createScalarNode(this, parent, subpath, environment, initialValue);
    };
    Literal.prototype.describe = function () {
        return JSON.stringify(this.value);
    };
    Literal.prototype.isValidSnapshot = function (value, context) {
        if (isPrimitive(value) && value === this.value) {
            return typeCheckSuccess();
        }
        return typeCheckFailure(context, value, "Value is not a literal " + JSON.stringify(this.value));
    };
    return Literal;
}(SimpleType));
/**
 * `types.literal` - The literal type will return a type that will match only the exact given type.
 * The given value must be a primitive, in order to be serialized to a snapshot correctly.
 * You can use literal to match exact strings for example the exact male or female string.
 *
 * Example:
 * ```ts
 * const Person = types.model({
 *     name: types.string,
 *     gender: types.union(types.literal('male'), types.literal('female'))
 * })
 * ```
 *
 * @param value The value to use in the strict equal check
 * @returns
 */
function literal(value) {
    // check that the given value is a primitive
    assertArg(value, isPrimitive, "primitive", 1);
    return new Literal(value);
}
/**
 * Returns if a given value represents a literal type.
 *
 * @param type
 * @returns
 */
function isLiteralType(type) {
    return isType(type) && (type.flags & TypeFlags.Literal) > 0;
}

var Refinement = /** @class */ (function (_super) {
    __extends(Refinement, _super);
    function Refinement(name, _subtype, _predicate, _message) {
        var _this = _super.call(this, name) || this;
        _this._subtype = _subtype;
        _this._predicate = _predicate;
        _this._message = _message;
        return _this;
    }
    Object.defineProperty(Refinement.prototype, "flags", {
        get: function () {
            return this._subtype.flags | TypeFlags.Refinement;
        },
        enumerable: true,
        configurable: true
    });
    Refinement.prototype.describe = function () {
        return this.name;
    };
    Refinement.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        // create the child type
        return this._subtype.instantiate(parent, subpath, environment, initialValue);
    };
    Refinement.prototype.isAssignableFrom = function (type) {
        return this._subtype.isAssignableFrom(type);
    };
    Refinement.prototype.isValidSnapshot = function (value, context) {
        var subtypeErrors = this._subtype.validate(value, context);
        if (subtypeErrors.length > 0)
            return subtypeErrors;
        var snapshot = isStateTreeNode(value) ? getStateTreeNode(value).snapshot : value;
        if (!this._predicate(snapshot)) {
            return typeCheckFailure(context, value, this._message(value));
        }
        return typeCheckSuccess();
    };
    Refinement.prototype.reconcile = function (current, newValue, parent, subpath) {
        return this._subtype.reconcile(current, newValue, parent, subpath);
    };
    Refinement.prototype.getSubTypes = function () {
        return this._subtype;
    };
    return Refinement;
}(BaseType));
/**
 * `types.refinement` - Creates a type that is more specific than the base type, e.g. `types.refinement(types.string, value => value.length > 5)` to create a type of strings that can only be longer then 5.
 *
 * @param name
 * @param type
 * @param predicate
 * @returns
 */
function refinement() {
    var args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        args[_i] = arguments[_i];
    }
    var name = typeof args[0] === "string" ? args.shift() : isType(args[0]) ? args[0].name : null;
    var type = args[0];
    var predicate = args[1];
    var message = args[2]
        ? args[2]
        : function (v) { return "Value does not respect the refinement predicate"; };
    // ensures all parameters are correct
    assertIsType(type, [1, 2]);
    assertIsString(name, 1);
    assertIsFunction(predicate, [2, 3]);
    assertIsFunction(message, [3, 4]);
    return new Refinement(name, type, predicate, message);
}
/**
 * Returns if a given value is a refinement type.
 *
 * @param type
 * @returns
 */
function isRefinementType(type) {
    return (type.flags & TypeFlags.Refinement) > 0;
}

/**
 * `types.enumeration` - Can be used to create an string based enumeration.
 * (note: this methods is just sugar for a union of string literals)
 *
 * Example:
 * ```ts
 * const TrafficLight = types.model({
 *   color: types.enumeration("Color", ["Red", "Orange", "Green"])
 * })
 * ```
 *
 * @param name descriptive name of the enumeration (optional)
 * @param options possible values this enumeration can have
 * @returns
 */
function enumeration(name, options) {
    var realOptions = typeof name === "string" ? options : name;
    // check all options
    if (devMode()) {
        realOptions.forEach(function (option, i) {
            assertIsString(option, i + 1);
        });
    }
    var type = union.apply(void 0, __spread(realOptions.map(function (option) { return literal("" + option); })));
    if (typeof name === "string")
        type.name = name;
    return type;
}

/**
 * @internal
 * @hidden
 */
var Union = /** @class */ (function (_super) {
    __extends(Union, _super);
    function Union(name, _types, options) {
        var _this = _super.call(this, name) || this;
        _this._types = _types;
        _this._eager = true;
        options = __assign({ eager: true, dispatcher: undefined }, options);
        _this._dispatcher = options.dispatcher;
        if (!options.eager)
            _this._eager = false;
        return _this;
    }
    Object.defineProperty(Union.prototype, "flags", {
        get: function () {
            var result = TypeFlags.Union;
            this._types.forEach(function (type) {
                result |= type.flags;
            });
            return result;
        },
        enumerable: true,
        configurable: true
    });
    Union.prototype.isAssignableFrom = function (type) {
        return this._types.some(function (subType) { return subType.isAssignableFrom(type); });
    };
    Union.prototype.describe = function () {
        return "(" + this._types.map(function (factory) { return factory.describe(); }).join(" | ") + ")";
    };
    Union.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        var type = this.determineType(initialValue, undefined);
        if (!type)
            throw fail$1("No matching type for union " + this.describe()); // can happen in prod builds
        return type.instantiate(parent, subpath, environment, initialValue);
    };
    Union.prototype.reconcile = function (current, newValue, parent, subpath) {
        var type = this.determineType(newValue, current.type);
        if (!type)
            throw fail$1("No matching type for union " + this.describe()); // can happen in prod builds
        return type.reconcile(current, newValue, parent, subpath);
    };
    Union.prototype.determineType = function (value, reconcileCurrentType) {
        // try the dispatcher, if defined
        if (this._dispatcher) {
            return this._dispatcher(value);
        }
        // find the most accomodating type
        // if we are using reconciliation try the current node type first (fix for #1045)
        if (reconcileCurrentType) {
            if (reconcileCurrentType.is(value)) {
                return reconcileCurrentType;
            }
            return this._types.filter(function (t) { return t !== reconcileCurrentType; }).find(function (type) { return type.is(value); });
        }
        else {
            return this._types.find(function (type) { return type.is(value); });
        }
    };
    Union.prototype.isValidSnapshot = function (value, context) {
        if (this._dispatcher) {
            return this._dispatcher(value).validate(value, context);
        }
        var allErrors = [];
        var applicableTypes = 0;
        for (var i = 0; i < this._types.length; i++) {
            var type = this._types[i];
            var errors = type.validate(value, context);
            if (errors.length === 0) {
                if (this._eager)
                    return typeCheckSuccess();
                else
                    applicableTypes++;
            }
            else {
                allErrors.push(errors);
            }
        }
        if (applicableTypes === 1)
            return typeCheckSuccess();
        return typeCheckFailure(context, value, "No type is applicable for the union").concat(flattenTypeErrors(allErrors));
    };
    Union.prototype.getSubTypes = function () {
        return this._types;
    };
    return Union;
}(BaseType));
/**
 * `types.union` - Create a union of multiple types. If the correct type cannot be inferred unambiguously from a snapshot, provide a dispatcher function of the form `(snapshot) => Type`.
 *
 * @param optionsOrType
 * @param otherTypes
 * @returns
 */
function union(optionsOrType) {
    var otherTypes = [];
    for (var _i = 1; _i < arguments.length; _i++) {
        otherTypes[_i - 1] = arguments[_i];
    }
    var options = isType(optionsOrType) ? undefined : optionsOrType;
    var types = isType(optionsOrType) ? __spread([optionsOrType], otherTypes) : otherTypes;
    var name = "(" + types.map(function (type) { return type.name; }).join(" | ") + ")";
    // check all options
    if (devMode()) {
        if (options) {
            assertArg(options, function (o) { return isPlainObject(o); }, "object { eager?: boolean, dispatcher?: Function }", 1);
        }
        types.forEach(function (type, i) {
            assertIsType(type, options ? i + 2 : i + 1);
        });
    }
    return new Union(name, types, options);
}
/**
 * Returns if a given value represents a union type.
 *
 * @param type
 * @returns
 */
function isUnionType(type) {
    return (type.flags & TypeFlags.Union) > 0;
}

/**
 * @hidden
 * @internal
 */
var OptionalValue = /** @class */ (function (_super) {
    __extends(OptionalValue, _super);
    function OptionalValue(_subtype, _defaultValue, optionalValues) {
        var _this = _super.call(this, _subtype.name) || this;
        _this._subtype = _subtype;
        _this._defaultValue = _defaultValue;
        _this.optionalValues = optionalValues;
        return _this;
    }
    Object.defineProperty(OptionalValue.prototype, "flags", {
        get: function () {
            return this._subtype.flags | TypeFlags.Optional;
        },
        enumerable: true,
        configurable: true
    });
    OptionalValue.prototype.describe = function () {
        return this._subtype.describe() + "?";
    };
    OptionalValue.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        if (this.optionalValues.indexOf(initialValue) >= 0) {
            var defaultInstanceOrSnapshot = this.getDefaultInstanceOrSnapshot();
            return this._subtype.instantiate(parent, subpath, environment, defaultInstanceOrSnapshot);
        }
        return this._subtype.instantiate(parent, subpath, environment, initialValue);
    };
    OptionalValue.prototype.reconcile = function (current, newValue, parent, subpath) {
        return this._subtype.reconcile(current, this.optionalValues.indexOf(newValue) < 0 && this._subtype.is(newValue)
            ? newValue
            : this.getDefaultInstanceOrSnapshot(), parent, subpath);
    };
    OptionalValue.prototype.getDefaultInstanceOrSnapshot = function () {
        var defaultInstanceOrSnapshot = typeof this._defaultValue === "function"
            ? this._defaultValue()
            : this._defaultValue;
        // while static values are already snapshots and checked on types.optional
        // generator functions must always be rechecked just in case
        if (typeof this._defaultValue === "function") {
            typecheckInternal(this, defaultInstanceOrSnapshot);
        }
        return defaultInstanceOrSnapshot;
    };
    OptionalValue.prototype.isValidSnapshot = function (value, context) {
        // defaulted values can be skipped
        if (this.optionalValues.indexOf(value) >= 0) {
            return typeCheckSuccess();
        }
        // bounce validation to the sub-type
        return this._subtype.validate(value, context);
    };
    OptionalValue.prototype.isAssignableFrom = function (type) {
        return this._subtype.isAssignableFrom(type);
    };
    OptionalValue.prototype.getSubTypes = function () {
        return this._subtype;
    };
    return OptionalValue;
}(BaseType));
function checkOptionalPreconditions(type, defaultValueOrFunction) {
    // make sure we never pass direct instances
    if (typeof defaultValueOrFunction !== "function" && isStateTreeNode(defaultValueOrFunction)) {
        throw fail$1("default value cannot be an instance, pass a snapshot or a function that creates an instance/snapshot instead");
    }
    assertIsType(type, 1);
    if (devMode()) {
        // we only check default values if they are passed directly
        // if they are generator functions they will be checked once they are generated
        // we don't check generator function results here to avoid generating a node just for type-checking purposes
        // which might generate side-effects
        if (typeof defaultValueOrFunction !== "function") {
            typecheckInternal(type, defaultValueOrFunction);
        }
    }
}
/**
 * `types.optional` - Can be used to create a property with a default value.
 *
 * Depending on the third argument (`optionalValues`) there are two ways of operation:
 * - If the argument is not provided, then if a value is not provided in the snapshot (`undefined` or missing),
 *   it will default to the provided `defaultValue`
 * - If the argument is provided, then if the value in the snapshot matches one of the optional values inside the array then it will
 *   default to the provided `defaultValue`. Additionally, if one of the optional values inside the array is `undefined` then a missing
 *   property is also valid.
 *
 *   Note that it is also possible to include values of the same type as the intended subtype as optional values,
 *   in this case the optional value will be transformed into the `defaultValue` (e.g. `types.optional(types.string, "unnamed", [undefined, ""])`
 *   will transform the snapshot values `undefined` (and therefore missing) and empty strings into the string `"unnamed"` when it gets
 *   instantiated).
 *
 * If `defaultValue` is a function, the function will be invoked for every new instance.
 * Applying a snapshot in which the optional value is one of the optional values (or `undefined`/_not_ present if none are provided) causes the
 * value to be reset.
 *
 * Example:
 * ```ts
 * const Todo = types.model({
 *   title: types.string,
 *   subtitle1: types.optional(types.string, "", [null]),
 *   subtitle2: types.optional(types.string, "", [null, undefined]),
 *   done: types.optional(types.boolean, false),
 *   created: types.optional(types.Date, () => new Date()),
 * })
 *
 * // if done is missing / undefined it will become false
 * // if created is missing / undefined it will get a freshly generated timestamp
 * // if subtitle1 is null it will default to "", but it cannot be missing or undefined
 * // if subtitle2 is null or undefined it will default to ""; since it can be undefined it can also be missing
 * const todo = Todo.create({ title: "Get coffee", subtitle1: null })
 * ```
 *
 * @param type
 * @param defaultValueOrFunction
 * @param optionalValues an optional array with zero or more primitive values (string, number, boolean, null or undefined)
 *                       that will be converted into the default. `[ undefined ]` is assumed when none is provided
 * @returns
 */
function optional(type, defaultValueOrFunction, optionalValues) {
    checkOptionalPreconditions(type, defaultValueOrFunction);
    return new OptionalValue(type, defaultValueOrFunction, optionalValues ? optionalValues : undefinedAsOptionalValues);
}
var undefinedAsOptionalValues = [undefined];
/**
 * Returns if a value represents an optional type.
 *
 * @template IT
 * @param type
 * @returns
 */
function isOptionalType(type) {
    return isType(type) && (type.flags & TypeFlags.Optional) > 0;
}

var optionalUndefinedType = optional(undefinedType, undefined);
var optionalNullType = optional(nullType, null);
/**
 * `types.maybe` - Maybe will make a type nullable, and also optional.
 * The value `undefined` will be used to represent nullability.
 *
 * @param type
 * @returns
 */
function maybe(type) {
    assertIsType(type, 1);
    return union(type, optionalUndefinedType);
}
/**
 * `types.maybeNull` - Maybe will make a type nullable, and also optional.
 * The value `null` will be used to represent no value.
 *
 * @param type
 * @returns
 */
function maybeNull(type) {
    assertIsType(type, 1);
    return union(type, optionalNullType);
}

var Late = /** @class */ (function (_super) {
    __extends(Late, _super);
    function Late(name, _definition) {
        var _this = _super.call(this, name) || this;
        _this._definition = _definition;
        return _this;
    }
    Object.defineProperty(Late.prototype, "flags", {
        get: function () {
            return (this._subType ? this._subType.flags : 0) | TypeFlags.Late;
        },
        enumerable: true,
        configurable: true
    });
    Late.prototype.getSubType = function (mustSucceed) {
        if (!this._subType) {
            var t = undefined;
            try {
                t = this._definition();
            }
            catch (e) {
                if (e instanceof ReferenceError)
                    // can happen in strict ES5 code when a definition is self refering
                    t = undefined;
                else
                    throw e;
            }
            if (mustSucceed && t === undefined)
                throw fail$1("Late type seems to be used too early, the definition (still) returns undefined");
            if (t) {
                if (devMode() && !isType(t))
                    throw fail$1("Failed to determine subtype, make sure types.late returns a type definition.");
                this._subType = t;
            }
        }
        return this._subType;
    };
    Late.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        return this.getSubType(true).instantiate(parent, subpath, environment, initialValue);
    };
    Late.prototype.reconcile = function (current, newValue, parent, subpath) {
        return this.getSubType(true).reconcile(current, newValue, parent, subpath);
    };
    Late.prototype.describe = function () {
        var t = this.getSubType(false);
        return t ? t.name : "<uknown late type>";
    };
    Late.prototype.isValidSnapshot = function (value, context) {
        var t = this.getSubType(false);
        if (!t) {
            // See #916; the variable the definition closure is pointing to wasn't defined yet, so can't be evaluted yet here
            return typeCheckSuccess();
        }
        return t.validate(value, context);
    };
    Late.prototype.isAssignableFrom = function (type) {
        var t = this.getSubType(false);
        return t ? t.isAssignableFrom(type) : false;
    };
    Late.prototype.getSubTypes = function () {
        var subtype = this.getSubType(false);
        return subtype ? subtype : cannotDetermineSubtype;
    };
    return Late;
}(BaseType));
/**
 * `types.late` - Defines a type that gets implemented later. This is useful when you have to deal with circular dependencies.
 * Please notice that when defining circular dependencies TypeScript isn't smart enough to inference them.
 *
 * Example:
 * ```ts
 *   // TypeScript isn't smart enough to infer self referencing types.
 *  const Node = types.model({
 *       children: types.array(types.late((): IAnyModelType => Node)) // then typecast each array element to Instance<typeof Node>
 *  })
 * ```
 *
 * @param name The name to use for the type that will be returned.
 * @param type A function that returns the type that will be defined.
 * @returns
 */
function late(nameOrType, maybeType) {
    var name = typeof nameOrType === "string" ? nameOrType : "late(" + nameOrType.toString() + ")";
    var type = typeof nameOrType === "string" ? maybeType : nameOrType;
    // checks that the type is actually a late type
    if (devMode()) {
        if (!(typeof type === "function" && type.length === 0))
            throw fail$1("Invalid late type, expected a function with zero arguments that returns a type, got: " +
                type);
    }
    return new Late(name, type);
}
/**
 * Returns if a given value represents a late type.
 *
 * @param type
 * @returns
 */
function isLateType(type) {
    return isType(type) && (type.flags & TypeFlags.Late) > 0;
}

/**
 * @internal
 * @hidden
 */
var Frozen = /** @class */ (function (_super) {
    __extends(Frozen, _super);
    function Frozen(subType) {
        var _this = _super.call(this, subType ? "frozen(" + subType.name + ")" : "frozen") || this;
        _this.subType = subType;
        _this.flags = TypeFlags.Frozen;
        return _this;
    }
    Frozen.prototype.describe = function () {
        return "<any immutable value>";
    };
    Frozen.prototype.instantiate = function (parent, subpath, environment, value) {
        // create the node
        return createScalarNode(this, parent, subpath, environment, deepFreeze(value));
    };
    Frozen.prototype.isValidSnapshot = function (value, context) {
        if (!isSerializable(value)) {
            return typeCheckFailure(context, value, "Value is not serializable and cannot be frozen");
        }
        if (this.subType)
            return this.subType.validate(value, context);
        return typeCheckSuccess();
    };
    return Frozen;
}(SimpleType));
var untypedFrozenInstance = new Frozen();
/**
 * `types.frozen` - Frozen can be used to store any value that is serializable in itself (that is valid JSON).
 * Frozen values need to be immutable or treated as if immutable. They need be serializable as well.
 * Values stored in frozen will snapshotted as-is by MST, and internal changes will not be tracked.
 *
 * This is useful to store complex, but immutable values like vectors etc. It can form a powerful bridge to parts of your application that should be immutable, or that assume data to be immutable.
 *
 * Note: if you want to store free-form state that is mutable, or not serializeable, consider using volatile state instead.
 *
 * Frozen properties can be defined in three different ways
 * 1. `types.frozen(SubType)` - provide a valid MST type and frozen will check if the provided data conforms the snapshot for that type
 * 2. `types.frozen({ someDefaultValue: true})` - provide a primitive value, object or array, and MST will infer the type from that object, and also make it the default value for the field
 * 3. `types.frozen<TypeScriptType>()` - provide a typescript type, to help in strongly typing the field (design time only)
 *
 * Example:
 * ```ts
 * const GameCharacter = types.model({
 *   name: string,
 *   location: types.frozen({ x: 0, y: 0})
 * })
 *
 * const hero = GameCharacter.create({
 *   name: "Mario",
 *   location: { x: 7, y: 4 }
 * })
 *
 * hero.location = { x: 10, y: 2 } // OK
 * hero.location.x = 7 // Not ok!
 * ```
 *
 * ```ts
 * type Point = { x: number, y: number }
 *    const Mouse = types.model({
 *         loc: types.frozen<Point>()
 *    })
 * ```
 *
 * @param defaultValueOrType
 * @returns
 */
function frozen(arg) {
    if (arguments.length === 0)
        return untypedFrozenInstance;
    else if (isType(arg))
        return new Frozen(arg);
    else
        return optional(untypedFrozenInstance, arg);
}
/**
 * Returns if a given value represents a frozen type.
 *
 * @param type
 * @returns
 */
function isFrozenType(type) {
    return isType(type) && (type.flags & TypeFlags.Frozen) > 0;
}

function getInvalidationCause(hook) {
    switch (hook) {
        case Hook.beforeDestroy:
            return "destroy";
        case Hook.beforeDetach:
            return "detach";
        default:
            return undefined;
    }
}
var StoredReference = /** @class */ (function () {
    function StoredReference(value, targetType) {
        this.targetType = targetType;
        if (isValidIdentifier(value)) {
            this.identifier = value;
        }
        else if (isStateTreeNode(value)) {
            var targetNode = getStateTreeNode(value);
            if (!targetNode.identifierAttribute)
                throw fail$1("Can only store references with a defined identifier attribute.");
            var id = targetNode.unnormalizedIdentifier;
            if (id === null || id === undefined) {
                throw fail$1("Can only store references to tree nodes with a defined identifier.");
            }
            this.identifier = id;
        }
        else {
            throw fail$1("Can only store references to tree nodes or identifiers, got: '" + value + "'");
        }
    }
    StoredReference.prototype.updateResolvedReference = function (node) {
        var normalizedId = normalizeIdentifier(this.identifier);
        var root = node.root;
        var lastCacheModification = root.identifierCache.getLastCacheModificationPerId(normalizedId);
        if (!this.resolvedReference ||
            this.resolvedReference.lastCacheModification !== lastCacheModification) {
            var targetType = this.targetType;
            // reference was initialized with the identifier of the target
            var target = root.identifierCache.resolve(targetType, normalizedId);
            if (!target) {
                throw new InvalidReferenceError("[mobx-state-tree] Failed to resolve reference '" + this.identifier + "' to type '" + this.targetType.name + "' (from node: " + node.path + ")");
            }
            this.resolvedReference = {
                node: target,
                lastCacheModification: lastCacheModification
            };
        }
    };
    Object.defineProperty(StoredReference.prototype, "resolvedValue", {
        get: function () {
            this.updateResolvedReference(this.node);
            return this.resolvedReference.node.value;
        },
        enumerable: true,
        configurable: true
    });
    return StoredReference;
}());
/**
 * @internal
 * @hidden
 */
var InvalidReferenceError = /** @class */ (function (_super) {
    __extends(InvalidReferenceError, _super);
    function InvalidReferenceError(m) {
        var _this = _super.call(this, m) || this;
        Object.setPrototypeOf(_this, InvalidReferenceError.prototype);
        return _this;
    }
    return InvalidReferenceError;
}(Error));
/**
 * @internal
 * @hidden
 */
var BaseReferenceType = /** @class */ (function (_super) {
    __extends(BaseReferenceType, _super);
    function BaseReferenceType(targetType, onInvalidated) {
        var _this = _super.call(this, "reference(" + targetType.name + ")") || this;
        _this.targetType = targetType;
        _this.onInvalidated = onInvalidated;
        _this.flags = TypeFlags.Reference;
        return _this;
    }
    BaseReferenceType.prototype.describe = function () {
        return this.name;
    };
    BaseReferenceType.prototype.isAssignableFrom = function (type) {
        return this.targetType.isAssignableFrom(type);
    };
    BaseReferenceType.prototype.isValidSnapshot = function (value, context) {
        return isValidIdentifier(value)
            ? typeCheckSuccess()
            : typeCheckFailure(context, value, "Value is not a valid identifier, which is a string or a number");
    };
    BaseReferenceType.prototype.fireInvalidated = function (cause, storedRefNode, referenceId, refTargetNode) {
        // to actually invalidate a reference we need an alive parent,
        // since it is a scalar value (immutable-ish) and we need to change it
        // from the parent
        var storedRefParentNode = storedRefNode.parent;
        if (!storedRefParentNode || !storedRefParentNode.isAlive) {
            return;
        }
        var storedRefParentValue = storedRefParentNode.storedValue;
        if (!storedRefParentValue) {
            return;
        }
        this.onInvalidated({
            cause: cause,
            parent: storedRefParentValue,
            invalidTarget: refTargetNode ? refTargetNode.storedValue : undefined,
            invalidId: referenceId,
            replaceRef: function (newRef) {
                applyPatch(storedRefNode.root.storedValue, {
                    op: "replace",
                    value: newRef,
                    path: storedRefNode.path
                });
            },
            removeRef: function () {
                if (isModelType(storedRefParentNode.type)) {
                    this.replaceRef(undefined);
                }
                else {
                    applyPatch(storedRefNode.root.storedValue, {
                        op: "remove",
                        path: storedRefNode.path
                    });
                }
            }
        });
    };
    BaseReferenceType.prototype.addTargetNodeWatcher = function (storedRefNode, referenceId) {
        var _this = this;
        // this will make sure the target node becomes created
        var refTargetValue = this.getValue(storedRefNode);
        if (!refTargetValue) {
            return undefined;
        }
        var refTargetNode = getStateTreeNode(refTargetValue);
        var hookHandler = function (_, refTargetNodeHook) {
            var cause = getInvalidationCause(refTargetNodeHook);
            if (!cause) {
                return;
            }
            _this.fireInvalidated(cause, storedRefNode, referenceId, refTargetNode);
        };
        var refTargetDetachHookDisposer = refTargetNode.registerHook(Hook.beforeDetach, hookHandler);
        var refTargetDestroyHookDisposer = refTargetNode.registerHook(Hook.beforeDestroy, hookHandler);
        return function () {
            refTargetDetachHookDisposer();
            refTargetDestroyHookDisposer();
        };
    };
    BaseReferenceType.prototype.watchTargetNodeForInvalidations = function (storedRefNode, identifier, customGetSet) {
        var _this = this;
        if (!this.onInvalidated) {
            return;
        }
        var onRefTargetDestroyedHookDisposer;
        // get rid of the watcher hook when the stored ref node is destroyed
        // detached is ignored since scalar nodes (where the reference resides) cannot be detached
        storedRefNode.registerHook(Hook.beforeDestroy, function () {
            if (onRefTargetDestroyedHookDisposer) {
                onRefTargetDestroyedHookDisposer();
            }
        });
        var startWatching = function (sync) {
            // re-create hook in case the stored ref gets reattached
            if (onRefTargetDestroyedHookDisposer) {
                onRefTargetDestroyedHookDisposer();
            }
            // make sure the target node is actually there and initialized
            var storedRefParentNode = storedRefNode.parent;
            var storedRefParentValue = storedRefParentNode && storedRefParentNode.storedValue;
            if (storedRefParentNode && storedRefParentNode.isAlive && storedRefParentValue) {
                var refTargetNodeExists = void 0;
                if (customGetSet) {
                    refTargetNodeExists = !!customGetSet.get(identifier, storedRefParentValue);
                }
                else {
                    refTargetNodeExists = storedRefNode.root.identifierCache.has(_this.targetType, normalizeIdentifier(identifier));
                }
                if (!refTargetNodeExists) {
                    // we cannot change the reference in sync mode
                    // since we are in the middle of a reconciliation/instantiation and the change would be overwritten
                    // for those cases just let the wrong reference be assigned and fail upon usage
                    // (like current references do)
                    // this means that effectively this code will only run when it is created from a snapshot
                    if (!sync) {
                        _this.fireInvalidated("invalidSnapshotReference", storedRefNode, identifier, null);
                    }
                }
                else {
                    onRefTargetDestroyedHookDisposer = _this.addTargetNodeWatcher(storedRefNode, identifier);
                }
            }
        };
        if (storedRefNode.state === NodeLifeCycle.FINALIZED) {
            // already attached, so the whole tree is ready
            startWatching(true);
        }
        else {
            if (!storedRefNode.isRoot) {
                // start watching once the whole tree is ready
                storedRefNode.root.registerHook(Hook.afterCreationFinalization, function () {
                    // make sure to attach it so it can start listening
                    if (storedRefNode.parent) {
                        storedRefNode.parent.createObservableInstanceIfNeeded();
                    }
                });
            }
            // start watching once the node is attached somewhere / parent changes
            storedRefNode.registerHook(Hook.afterAttach, function () {
                startWatching(false);
            });
        }
    };
    return BaseReferenceType;
}(SimpleType));
/**
 * @internal
 * @hidden
 */
var IdentifierReferenceType = /** @class */ (function (_super) {
    __extends(IdentifierReferenceType, _super);
    function IdentifierReferenceType(targetType, onInvalidated) {
        return _super.call(this, targetType, onInvalidated) || this;
    }
    IdentifierReferenceType.prototype.getValue = function (storedRefNode) {
        if (!storedRefNode.isAlive)
            return undefined;
        var storedRef = storedRefNode.storedValue;
        return storedRef.resolvedValue;
    };
    IdentifierReferenceType.prototype.getSnapshot = function (storedRefNode) {
        var ref = storedRefNode.storedValue;
        return ref.identifier;
    };
    IdentifierReferenceType.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        var identifier = isStateTreeNode(initialValue)
            ? getIdentifier(initialValue)
            : initialValue;
        var storedRef = new StoredReference(initialValue, this.targetType);
        var storedRefNode = createScalarNode(this, parent, subpath, environment, storedRef);
        storedRef.node = storedRefNode;
        this.watchTargetNodeForInvalidations(storedRefNode, identifier, undefined);
        return storedRefNode;
    };
    IdentifierReferenceType.prototype.reconcile = function (current, newValue, parent, subpath) {
        if (!current.isDetaching && current.type === this) {
            var compareByValue = isStateTreeNode(newValue);
            var ref = current.storedValue;
            if ((!compareByValue && ref.identifier === newValue) ||
                (compareByValue && ref.resolvedValue === newValue)) {
                current.setParent(parent, subpath);
                return current;
            }
        }
        var newNode = this.instantiate(parent, subpath, undefined, newValue);
        current.die(); // noop if detaching
        return newNode;
    };
    return IdentifierReferenceType;
}(BaseReferenceType));
/**
 * @internal
 * @hidden
 */
var CustomReferenceType = /** @class */ (function (_super) {
    __extends(CustomReferenceType, _super);
    function CustomReferenceType(targetType, options, onInvalidated) {
        var _this = _super.call(this, targetType, onInvalidated) || this;
        _this.options = options;
        return _this;
    }
    CustomReferenceType.prototype.getValue = function (storedRefNode) {
        if (!storedRefNode.isAlive)
            return undefined;
        var referencedNode = this.options.get(storedRefNode.storedValue, storedRefNode.parent ? storedRefNode.parent.storedValue : null);
        return referencedNode;
    };
    CustomReferenceType.prototype.getSnapshot = function (storedRefNode) {
        return storedRefNode.storedValue;
    };
    CustomReferenceType.prototype.instantiate = function (parent, subpath, environment, newValue) {
        var identifier = isStateTreeNode(newValue)
            ? this.options.set(newValue, parent ? parent.storedValue : null)
            : newValue;
        var storedRefNode = createScalarNode(this, parent, subpath, environment, identifier);
        this.watchTargetNodeForInvalidations(storedRefNode, identifier, this.options);
        return storedRefNode;
    };
    CustomReferenceType.prototype.reconcile = function (current, newValue, parent, subpath) {
        var newIdentifier = isStateTreeNode(newValue)
            ? this.options.set(newValue, current ? current.storedValue : null)
            : newValue;
        if (!current.isDetaching &&
            current.type === this &&
            current.storedValue === newIdentifier) {
            current.setParent(parent, subpath);
            return current;
        }
        var newNode = this.instantiate(parent, subpath, undefined, newIdentifier);
        current.die(); // noop if detaching
        return newNode;
    };
    return CustomReferenceType;
}(BaseReferenceType));
/**
 * `types.reference` - Creates a reference to another type, which should have defined an identifier.
 * See also the [reference and identifiers](https://github.com/mobxjs/mobx-state-tree#references-and-identifiers) section.
 */
function reference(subType, options) {
    assertIsType(subType, 1);
    if (devMode()) {
        if (arguments.length === 2 && typeof arguments[1] === "string") {
            // istanbul ignore next
            throw fail$1("References with base path are no longer supported. Please remove the base path.");
        }
    }
    var getSetOptions = options ? options : undefined;
    var onInvalidated = options
        ? options.onInvalidated
        : undefined;
    if (getSetOptions && (getSetOptions.get || getSetOptions.set)) {
        if (devMode()) {
            if (!getSetOptions.get || !getSetOptions.set) {
                throw fail$1("reference options must either contain both a 'get' and a 'set' method or none of them");
            }
        }
        return new CustomReferenceType(subType, {
            get: getSetOptions.get,
            set: getSetOptions.set
        }, onInvalidated);
    }
    else {
        return new IdentifierReferenceType(subType, onInvalidated);
    }
}
/**
 * Returns if a given value represents a reference type.
 *
 * @param type
 * @returns
 */
function isReferenceType(type) {
    return (type.flags & TypeFlags.Reference) > 0;
}
/**
 * `types.safeReference` - A safe reference is like a standard reference, except that it accepts the undefined value by default
 * and automatically sets itself to undefined (when the parent is a model) / removes itself from arrays and maps
 * when the reference it is pointing to gets detached/destroyed.
 *
 * The optional options parameter object accepts a parameter named `acceptsUndefined`, which is set to true by default, so it is suitable
 * for model properties.
 * When used inside collections (arrays/maps), it is recommended to set this option to false so it can't take undefined as value,
 * which is usually the desired in those cases.
 *
 * Strictly speaking it is a `types.maybe(types.reference(X))` (when `acceptsUndefined` is set to true, the default) and
 * `types.reference(X)` (when `acceptsUndefined` is set to false), both of them with a customized `onInvalidated` option.
 *
 * @param subType
 * @param options
 * @returns
 */
function safeReference(subType, options) {
    var refType = reference(subType, __assign(__assign({}, options), { onInvalidated: function (ev) {
            ev.removeRef();
        } }));
    if (options && options.acceptsUndefined === false) {
        return refType;
    }
    else {
        return maybe(refType);
    }
}

var BaseIdentifierType = /** @class */ (function (_super) {
    __extends(BaseIdentifierType, _super);
    function BaseIdentifierType(name, validType) {
        var _this = _super.call(this, name) || this;
        _this.validType = validType;
        _this.flags = TypeFlags.Identifier;
        return _this;
    }
    BaseIdentifierType.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        if (!parent || !(parent.type instanceof ModelType))
            throw fail$1("Identifier types can only be instantiated as direct child of a model type");
        return createScalarNode(this, parent, subpath, environment, initialValue);
    };
    BaseIdentifierType.prototype.reconcile = function (current, newValue, parent, subpath) {
        // we don't consider detaching here since identifier are scalar nodes, and scalar nodes cannot be detached
        if (current.storedValue !== newValue)
            throw fail$1("Tried to change identifier from '" + current.storedValue + "' to '" + newValue + "'. Changing identifiers is not allowed.");
        current.setParent(parent, subpath);
        return current;
    };
    BaseIdentifierType.prototype.isValidSnapshot = function (value, context) {
        if (typeof value !== this.validType) {
            return typeCheckFailure(context, value, "Value is not a valid " + this.describe() + ", expected a " + this.validType);
        }
        return typeCheckSuccess();
    };
    return BaseIdentifierType;
}(SimpleType));
/**
 * @internal
 * @hidden
 */
var IdentifierType = /** @class */ (function (_super) {
    __extends(IdentifierType, _super);
    function IdentifierType() {
        var _this = _super.call(this, "identifier", "string") || this;
        _this.flags = TypeFlags.Identifier;
        return _this;
    }
    IdentifierType.prototype.describe = function () {
        return "identifier";
    };
    return IdentifierType;
}(BaseIdentifierType));
/**
 * @internal
 * @hidden
 */
var IdentifierNumberType = /** @class */ (function (_super) {
    __extends(IdentifierNumberType, _super);
    function IdentifierNumberType() {
        return _super.call(this, "identifierNumber", "number") || this;
    }
    IdentifierNumberType.prototype.getSnapshot = function (node) {
        return node.storedValue;
    };
    IdentifierNumberType.prototype.describe = function () {
        return "identifierNumber";
    };
    return IdentifierNumberType;
}(BaseIdentifierType));
/**
 * `types.identifier` - Identifiers are used to make references, lifecycle events and reconciling works.
 * Inside a state tree, for each type can exist only one instance for each given identifier.
 * For example there couldn't be 2 instances of user with id 1. If you need more, consider using references.
 * Identifier can be used only as type property of a model.
 * This type accepts as parameter the value type of the identifier field that can be either string or number.
 *
 * Example:
 * ```ts
 *  const Todo = types.model("Todo", {
 *      id: types.identifier,
 *      title: types.string
 *  })
 * ```
 *
 * @returns
 */
var identifier = new IdentifierType();
/**
 * `types.identifierNumber` - Similar to `types.identifier`. This one will serialize from / to a number when applying snapshots
 *
 * Example:
 * ```ts
 *  const Todo = types.model("Todo", {
 *      id: types.identifierNumber,
 *      title: types.string
 *  })
 * ```
 *
 * @returns
 */
var identifierNumber = new IdentifierNumberType();
/**
 * Returns if a given value represents an identifier type.
 *
 * @param type
 * @returns
 */
function isIdentifierType(type) {
    return isType(type) && (type.flags & TypeFlags.Identifier) > 0;
}
/**
 * @internal
 * @hidden
 */
function normalizeIdentifier(id) {
    return "" + id;
}
/**
 * @internal
 * @hidden
 */
function isValidIdentifier(id) {
    return typeof id === "string" || typeof id === "number";
}
/**
 * @internal
 * @hidden
 */
function assertIsValidIdentifier(id, argNumber) {
    assertArg(id, isValidIdentifier, "string or number (identifier)", argNumber);
}

/**
 * `types.custom` - Creates a custom type. Custom types can be used for arbitrary immutable values, that have a serializable representation. For example, to create your own Date representation, Decimal type etc.
 *
 * The signature of the options is:
 * ```ts
 * export interface CustomTypeOptions<S, T> {
 *     // Friendly name
 *     name: string
 *     // given a serialized value, how to turn it into the target type
 *     fromSnapshot(snapshot: S): T
 *     // return the serialization of the current value
 *     toSnapshot(value: T): S
 *     // if true, this is a converted value, if false, it's a snapshot
 *     isTargetType(value: T | S): value is T
 *     // a non empty string is assumed to be a validation error
 *     getValidationMessage?(snapshot: S): string
 * }
 * ```
 *
 * Example:
 * ```ts
 * const DecimalPrimitive = types.custom<string, Decimal>({
 *     name: "Decimal",
 *     fromSnapshot(value: string) {
 *         return new Decimal(value)
 *     },
 *     toSnapshot(value: Decimal) {
 *         return value.toString()
 *     },
 *     isTargetType(value: string | Decimal): boolean {
 *         return value instanceof Decimal
 *     },
 *     getValidationMessage(value: string): string {
 *         if (/^-?\d+\.\d+$/.test(value)) return "" // OK
 *         return `'${value}' doesn't look like a valid decimal number`
 *     }
 * })
 *
 * const Wallet = types.model({
 *     balance: DecimalPrimitive
 * })
 * ```
 *
 * @param options
 * @returns
 */
function custom(options) {
    return new CustomType(options);
}
/**
 * @internal
 * @hidden
 */
var CustomType = /** @class */ (function (_super) {
    __extends(CustomType, _super);
    function CustomType(options) {
        var _this = _super.call(this, options.name) || this;
        _this.options = options;
        _this.flags = TypeFlags.Custom;
        return _this;
    }
    CustomType.prototype.describe = function () {
        return this.name;
    };
    CustomType.prototype.isValidSnapshot = function (value, context) {
        if (this.options.isTargetType(value))
            return typeCheckSuccess();
        var typeError = this.options.getValidationMessage(value);
        if (typeError) {
            return typeCheckFailure(context, value, "Invalid value for type '" + this.name + "': " + typeError);
        }
        return typeCheckSuccess();
    };
    CustomType.prototype.getSnapshot = function (node) {
        return this.options.toSnapshot(node.storedValue);
    };
    CustomType.prototype.instantiate = function (parent, subpath, environment, initialValue) {
        var valueToStore = this.options.isTargetType(initialValue)
            ? initialValue
            : this.options.fromSnapshot(initialValue);
        return createScalarNode(this, parent, subpath, environment, valueToStore);
    };
    CustomType.prototype.reconcile = function (current, value, parent, subpath) {
        var isSnapshot = !this.options.isTargetType(value);
        // in theory customs use scalar nodes which cannot be detached, but still...
        if (!current.isDetaching) {
            var unchanged = current.type === this &&
                (isSnapshot ? value === current.snapshot : value === current.storedValue);
            if (unchanged) {
                current.setParent(parent, subpath);
                return current;
            }
        }
        var valueToStore = isSnapshot ? this.options.fromSnapshot(value) : value;
        var newNode = this.instantiate(parent, subpath, undefined, valueToStore);
        current.die(); // noop if detaching
        return newNode;
    };
    return CustomType;
}(SimpleType));

// we import the types to re-export them inside types.
var types = {
    enumeration: enumeration,
    model: model,
    compose: compose,
    custom: custom,
    reference: reference,
    safeReference: safeReference,
    union: union,
    optional: optional,
    literal: literal,
    maybe: maybe,
    maybeNull: maybeNull,
    refinement: refinement,
    string: string,
    boolean: boolean,
    number: number,
    integer: integer,
    Date: DatePrimitive,
    map: map,
    array: array,
    frozen: frozen,
    identifier: identifier,
    identifierNumber: identifierNumber,
    late: late,
    undefined: undefinedType,
    null: nullType,
    snapshotProcessor: snapshotProcessor
};

export { addDisposer, addMiddleware, applyAction, applyPatch, applySnapshot, cast, castFlowReturn, castToReferenceSnapshot, castToSnapshot, clone, createActionTrackingMiddleware, createActionTrackingMiddleware2, decorate, destroy, detach, escapeJsonPath, flow, getChildType, getEnv, getIdentifier, getLivelinessChecking, getMembers, getNodeId, getParent, getParentOfType, getPath, getPathParts, getPropertyMembers, getRelativePath, getRoot, getRunningActionContext, getSnapshot, getType, hasParent, hasParentOfType, isActionContextChildOf, isActionContextThisOrChildOf, isAlive, isArrayType, isFrozenType, isIdentifierType, isLateType, isLiteralType, isMapType, isModelType, isOptionalType, isPrimitiveType, isProtected, isReferenceType, isRefinementType, isRoot, isStateTreeNode, isType, isUnionType, isValidReference, joinJsonPath, onAction, onPatch, onSnapshot, process$1 as process, protect, recordActions, recordPatches, resolveIdentifier, resolvePath, setLivelinessChecking, setLivelynessChecking, splitJsonPath, tryReference, tryResolve, typecheck, types, unescapeJsonPath, unprotect, walk };