mobx-state-tree/dist/mobx-state-tree.js

Opinionated, transactional, MobX powered state container

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var mobx = require('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);
}

/**
 * @internal
 * @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 */

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function __spread() {
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}

/**
 * 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({}, 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 (mobx.isComputedProp(target, key))
                reflected.views.push(key);
            else
                reflected.volatile.push(key);
            return;
        }
        if (descriptor.value._isMSTAction === true)
            reflected.actions.push(key);
        else if (mobx.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 = mobx.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 = mobx.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([
        mobx.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 (mobx._allowStateChangesInsideComputed) {
                mobx._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.isR