"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Collection = void 0;
/**
 * A Map with additional utility methods. This is used throughout discord.js rather than Arrays for anything that has
 * an ID, for significantly improved performance and ease-of-use.
 * @extends {Map}
 * @property {number} size - The amount of elements in this collection.
 */
class Collection extends Map {
    constructor(entries) {
        super(entries);
        /**
         * Cached array for the `array()` method - will be reset to `null` whenever `set()` or `delete()` are called
         * @name Collection#_array
         * @type {?Array}
         * @private
         */
        Object.defineProperty(this, '_array', { value: null, writable: true, configurable: true });
        /**
         * Cached array for the `keyArray()` method - will be reset to `null` whenever `set()` or `delete()` are called
         * @name Collection#_keyArray
         * @type {?Array}
         * @private
         */
        Object.defineProperty(this, '_keyArray', { value: null, writable: true, configurable: true });
    }
    /**
     * Identical to [Map.get()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/get).
     * Gets an element with the specified key, and returns its value, or `undefined` if the element does not exist.
     * @param {*} key - The key to get from this collection
     * @returns {* | undefined}
     */
    get(key) {
        return super.get(key);
    }
    /**
     * Identical to [Map.set()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set).
     * Sets a new element in the collection with the specified key and value.
     * @param {*} key - The key of the element to add
     * @param {*} value - The value of the element to add
     * @returns {Collection}
     */
    set(key, value) {
        this._array = null;
        this._keyArray = null;
        return super.set(key, value);
    }
    /**
     * Identical to [Map.has()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/has).
     * Checks if an element exists in the collection.
     * @param {*} key - The key of the element to check for
     * @returns {boolean} `true` if the element exists, `false` if it does not exist.
     */
    has(key) {
        return super.has(key);
    }
    /**
     * Identical to [Map.delete()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete).
     * Deletes an element from the collection.
     * @param {*} key - The key to delete from the collection
     * @returns {boolean} `true` if the element was removed, `false` if the element does not exist.
     */
    delete(key) {
        this._array = null;
        this._keyArray = null;
        return super.delete(key);
    }
    /**
     * Identical to [Map.clear()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear).
     * Removes all elements from the collection.
     * @returns {undefined}
     */
    clear() {
        return super.clear();
    }
    /**
     * Creates an ordered array of the values of this collection, and caches it internally. The array will only be
     * reconstructed if an item is added to or removed from the collection, or if you change the length of the array
     * itself. If you don't want this caching behavior, use `[...collection.values()]` or
     * `Array.from(collection.values())` instead.
     * @returns {Array}
     */
    array() {
        if (!this._array || this._array.length !== this.size)
            this._array = [...this.values()];
        return this._array;
    }
    /**
     * Creates an ordered array of the keys of this collection, and caches it internally. The array will only be
     * reconstructed if an item is added to or removed from the collection, or if you change the length of the array
     * itself. If you don't want this caching behavior, use `[...collection.keys()]` or
     * `Array.from(collection.keys())` instead.
     * @returns {Array}
     */
    keyArray() {
        if (!this._keyArray || this._keyArray.length !== this.size)
            this._keyArray = [...this.keys()];
        return this._keyArray;
    }
    first(amount) {
        if (typeof amount === 'undefined')
            return this.values().next().value;
        if (amount < 0)
            return this.last(amount * -1);
        amount = Math.min(this.size, amount);
        const iter = this.values();
        return Array.from({ length: amount }, () => iter.next().value);
    }
    firstKey(amount) {
        if (typeof amount === 'undefined')
            return this.keys().next().value;
        if (amount < 0)
            return this.lastKey(amount * -1);
        amount = Math.min(this.size, amount);
        const iter = this.keys();
        return Array.from({ length: amount }, () => iter.next().value);
    }
    last(amount) {
        const arr = this.array();
        if (typeof amount === 'undefined')
            return arr[arr.length - 1];
        if (amount < 0)
            return this.first(amount * -1);
        if (!amount)
            return [];
        return arr.slice(-amount);
    }
    lastKey(amount) {
        const arr = this.keyArray();
        if (typeof amount === 'undefined')
            return arr[arr.length - 1];
        if (amount < 0)
            return this.firstKey(amount * -1);
        if (!amount)
            return [];
        return arr.slice(-amount);
    }
    random(amount) {
        let arr = this.array();
        if (typeof amount === 'undefined')
            return arr[Math.floor(Math.random() * arr.length)];
        if (arr.length === 0 || !amount)
            return [];
        arr = arr.slice();
        return Array.from({ length: amount }, () => arr.splice(Math.floor(Math.random() * arr.length), 1)[0]);
    }
    randomKey(amount) {
        let arr = this.keyArray();
        if (typeof amount === 'undefined')
            return arr[Math.floor(Math.random() * arr.length)];
        if (arr.length === 0 || !amount)
            return [];
        arr = arr.slice();
        return Array.from({ length: amount }, () => arr.splice(Math.floor(Math.random() * arr.length), 1)[0]);
    }
    find(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        for (const [key, val] of this) {
            if (fn(val, key, this))
                return val;
        }
        return undefined;
    }
    findKey(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        for (const [key, val] of this) {
            if (fn(val, key, this))
                return key;
        }
        return undefined;
    }
    sweep(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        const previousSize = this.size;
        for (const [key, val] of this) {
            if (fn(val, key, this))
                this.delete(key);
        }
        return previousSize - this.size;
    }
    filter(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        const results = new this.constructor[Symbol.species]();
        for (const [key, val] of this) {
            if (fn(val, key, this))
                results.set(key, val);
        }
        return results;
    }
    partition(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        // TODO: consider removing the <K, V> from the constructors after TS 3.7.0 is released, as it infers it
        const results = [new this.constructor[Symbol.species](), new this.constructor[Symbol.species]()];
        for (const [key, val] of this) {
            if (fn(val, key, this)) {
                results[0].set(key, val);
            }
            else {
                results[1].set(key, val);
            }
        }
        return results;
    }
    flatMap(fn, thisArg) {
        const collections = this.map(fn, thisArg);
        return new this.constructor[Symbol.species]().concat(...collections);
    }
    map(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        const iter = this.entries();
        return Array.from({ length: this.size }, () => {
            const [key, value] = iter.next().value;
            return fn(value, key, this);
        });
    }
    mapValues(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        const coll = new this.constructor[Symbol.species]();
        for (const [key, val] of this)
            coll.set(key, fn(val, key, this));
        return coll;
    }
    some(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        for (const [key, val] of this) {
            if (fn(val, key, this))
                return true;
        }
        return false;
    }
    every(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        for (const [key, val] of this) {
            if (!fn(val, key, this))
                return false;
        }
        return true;
    }
    /**
     * Applies a function to produce a single value. Identical in behavior to
     * [Array.reduce()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce).
     * @param {Function} fn Function used to reduce, taking four arguments; `accumulator`, `currentValue`, `currentKey`,
     * and `collection`
     * @param {*} [initialValue] Starting value for the accumulator
     * @returns {*}
     * @example collection.reduce((acc, guild) => acc + guild.memberCount, 0);
     */
    reduce(fn, initialValue) {
        let accumulator;
        if (typeof initialValue !== 'undefined') {
            accumulator = initialValue;
            for (const [key, val] of this)
                accumulator = fn(accumulator, val, key, this);
            return accumulator;
        }
        let first = true;
        for (const [key, val] of this) {
            if (first) {
                accumulator = val;
                first = false;
                continue;
            }
            accumulator = fn(accumulator, val, key, this);
        }
        // No items iterated.
        if (first) {
            throw new TypeError('Reduce of empty collection with no initial value');
        }
        return accumulator;
    }
    each(fn, thisArg) {
        this.forEach(fn, thisArg);
        return this;
    }
    tap(fn, thisArg) {
        if (typeof thisArg !== 'undefined')
            fn = fn.bind(thisArg);
        fn(this);
        return this;
    }
    /**
     * Creates an identical shallow copy of this collection.
     * @returns {Collection}
     * @example const newColl = someColl.clone();
     */
    clone() {
        return new this.constructor[Symbol.species](this);
    }
    /**
     * Combines this collection with others into a new collection. None of the source collections are modified.
     * @param {...Collection} collections Collections to merge
     * @returns {Collection}
     * @example const newColl = someColl.concat(someOtherColl, anotherColl, ohBoyAColl);
     */
    concat(...collections) {
        const newColl = this.clone();
        for (const coll of collections) {
            for (const [key, val] of coll)
                newColl.set(key, val);
        }
        return newColl;
    }
    /**
     * Checks if this collection shares identical items with another.
     * This is different to checking for equality using equal-signs, because
     * the collections may be different objects, but contain the same data.
     * @param {Collection} collection Collection to compare with
     * @returns {boolean} Whether the collections have identical contents
     */
    equals(collection) {
        if (!collection)
            return false;
        if (this === collection)
            return true;
        if (this.size !== collection.size)
            return false;
        for (const [key, value] of this) {
            if (!collection.has(key) || value !== collection.get(key)) {
                return false;
            }
        }
        return true;
    }
    /**
     * The sort method sorts the items of a collection in place and returns it.
     * The sort is not necessarily stable in Node 10 or older.
     * The default sort order is according to string Unicode code points.
     * @param {Function} [compareFunction] Specifies a function that defines the sort order.
     * If omitted, the collection is sorted according to each character's Unicode code point value,
     * according to the string conversion of each element.
     * @returns {Collection}
     * @example collection.sort((userA, userB) => userA.createdTimestamp - userB.createdTimestamp);
     */
    sort(compareFunction = (x, y) => Number(x > y) || Number(x === y) - 1) {
        const entries = [...this.entries()];
        entries.sort((a, b) => compareFunction(a[1], b[1], a[0], b[0]));
        // Perform clean-up
        super.clear();
        this._array = null;
        this._keyArray = null;
        // Set the new entries
        for (const [k, v] of entries) {
            super.set(k, v);
        }
        return this;
    }
    /**
     * The intersect method returns a new structure containing items where the keys are present in both original structures.
     * @param {Collection} other The other Collection to filter against
     * @returns {Collection}
     */
    intersect(other) {
        return other.filter((_, k) => this.has(k));
    }
    /**
     * The difference method returns a new structure containing items where the key is present in one of the original structures but not the other.
     * @param {Collection} other The other Collection to filter against
     * @returns {Collection}
     */
    difference(other) {
        return other.filter((_, k) => !this.has(k)).concat(this.filter((_, k) => !other.has(k)));
    }
    /**
     * The sorted method sorts the items of a collection and returns it.
     * The sort is not necessarily stable in Node 10 or older.
     * The default sort order is according to string Unicode code points.
     * @param {Function} [compareFunction] Specifies a function that defines the sort order.
     * If omitted, the collection is sorted according to each character's Unicode code point value,
     * according to the string conversion of each element.
     * @returns {Collection}
     * @example collection.sorted((userA, userB) => userA.createdTimestamp - userB.createdTimestamp);
     */
    sorted(compareFunction = (x, y) => Number(x > y) || Number(x === y) - 1) {
        return new this.constructor[Symbol.species]([...this.entries()])
            .sort((av, bv, ak, bk) => compareFunction(av, bv, ak, bk));
    }
}
exports.Collection = Collection;
Collection.default = Collection;
module.exports = Collection;
exports.default = Collection;
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interface CollectionConstructor {\n\tnew(): Collection<unknown, unknown>;\n\tnew<K, V>(entries?: ReadonlyArray<readonly [K, V]> | null): Collection<K, V>;\n\tnew<K, V>(iterable: Iterable<readonly [K, V]>): Collection<K, V>;\n\treadonly prototype: Collection<unknown, unknown>;\n\treadonly [Symbol.species]: CollectionConstructor;\n}\n\n/**\n * A Map with additional utility methods. This is used throughout discord.js rather than Arrays for anything that has\n * an ID, for significantly improved performance and ease-of-use.\n * @extends {Map}\n * @property {number} size - The amount of elements in this collection.\n */\nclass Collection<K, V> extends Map<K, V> {\n\tprivate _array!: V[] | null;\n\tprivate _keyArray!: K[] | null;\n\tpublic static readonly default: typeof Collection = Collection;\n\tpublic ['constructor']: typeof Collection;\n\n\tpublic constructor(entries?: ReadonlyArray<readonly [K, V]> | null) {\n\t\tsuper(entries);\n\n\t\t/**\n\t\t * Cached array for the `array()` method - will be reset to `null` whenever `set()` or `delete()` are called\n\t\t * @name Collection#_array\n\t\t * @type {?Array}\n\t\t * @private\n\t\t */\n\t\tObject.defineProperty(this, '_array', { value: null, writable: true, configurable: true });\n\n\t\t/**\n\t\t * Cached array for the `keyArray()` method - will be reset to `null` whenever `set()` or `delete()` are called\n\t\t * @name Collection#_keyArray\n\t\t * @type {?Array}\n\t\t * @private\n\t\t */\n\t\tObject.defineProperty(this, '_keyArray', { value: null, writable: true, configurable: true });\n\t}\n\n\t/**\n\t * Identical to [Map.get()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/get).\n\t * Gets an element with the specified key, and returns its value, or `undefined` if the element does not exist.\n\t * @param {*} key - The key to get from this collection\n\t * @returns {* | undefined}\n\t */\n\tpublic get(key: K): V | undefined {\n\t\treturn super.get(key);\n\t}\n\n\t/**\n\t * Identical to [Map.set()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set).\n\t * Sets a new element in the collection with the specified key and value.\n\t * @param {*} key - The key of the element to add\n\t * @param {*} value - The value of the element to add\n\t * @returns {Collection}\n\t */\n\tpublic set(key: K, value: V): this {\n\t\tthis._array = null;\n\t\tthis._keyArray = null;\n\t\treturn super.set(key, value);\n\t}\n\n\t/**\n\t * Identical to [Map.has()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/has).\n\t * Checks if an element exists in the collection.\n\t * @param {*} key - The key of the element to check for\n\t * @returns {boolean} `true` if the element exists, `false` if it does not exist.\n\t */\n\tpublic has(key: K): boolean {\n\t\treturn super.has(key);\n\t}\n\n\t/**\n\t * Identical to [Map.delete()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete).\n\t * Deletes an element from the collection.\n\t * @param {*} key - The key to delete from the collection\n\t * @returns {boolean} `true` if the element was removed, `false` if the element does not exist.\n\t */\n\tpublic delete(key: K): boolean {\n\t\tthis._array = null;\n\t\tthis._keyArray = null;\n\t\treturn super.delete(key);\n\t}\n\n\t/**\n\t * Identical to [Map.clear()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear).\n\t * Removes all elements from the collection.\n\t * @returns {undefined}\n\t */\n\tpublic clear(): void {\n\t\treturn super.clear();\n\t}\n\n\t/**\n\t * Creates an ordered array of the values of this collection, and caches it internally. The array will only be\n\t * reconstructed if an item is added to or removed from the collection, or if you change the length of the array\n\t * itself. If you don't want this caching behavior, use `[...collection.values()]` or\n\t * `Array.from(collection.values())` instead.\n\t * @returns {Array}\n\t */\n\tpublic array(): V[] {\n\t\tif (!this._array || this._array.length !== this.size) this._array = [...this.values()];\n\t\treturn this._array;\n\t}\n\n\t/**\n\t * Creates an ordered array of the keys of this collection, and caches it internally. The array will only be\n\t * reconstructed if an item is added to or removed from the collection, or if you change the length of the array\n\t * itself. If you don't want this caching behavior, use `[...collection.keys()]` or\n\t * `Array.from(collection.keys())` instead.\n\t * @returns {Array}\n\t */\n\tpublic keyArray(): K[] {\n\t\tif (!this._keyArray || this._keyArray.length !== this.size) this._keyArray = [...this.keys()];\n\t\treturn this._keyArray;\n\t}\n\n\t/**\n\t * Obtains the first value(s) in this collection.\n\t * @param {number} [amount] Amount of values to obtain from the beginning\n\t * @returns {*|Array<*>} A single value if no amount is provided or an array of values, starting from the end if\n\t * amount is negative\n\t */\n\tpublic first(): V | undefined;\n\tpublic first(amount: number): V[];\n\tpublic first(amount?: number): V | V[] | undefined {\n\t\tif (typeof amount === 'undefined') return this.values().next().value;\n\t\tif (amount < 0) return this.last(amount * -1);\n\t\tamount = Math.min(this.size, amount);\n\t\tconst iter = this.values();\n\t\treturn Array.from({ length: amount }, (): V => iter.next().value);\n\t}\n\n\t/**\n\t * Obtains the first key(s) in this collection.\n\t * @param {number} [amount] Amount of keys to obtain from the beginning\n\t * @returns {*|Array<*>} A single key if no amount is provided or an array of keys, starting from the end if\n\t * amount is negative\n\t */\n\tpublic firstKey(): K | undefined;\n\tpublic firstKey(amount: number): K[];\n\tpublic firstKey(amount?: number): K | K[] | undefined {\n\t\tif (typeof amount === 'undefined') return this.keys().next().value;\n\t\tif (amount < 0) return this.lastKey(amount * -1);\n\t\tamount = Math.min(this.size, amount);\n\t\tconst iter = this.keys();\n\t\treturn Array.from({ length: amount }, (): K => iter.next().value);\n\t}\n\n\t/**\n\t * Obtains the last value(s) in this collection. This relies on {@link Collection#array}, and thus the caching\n\t * mechanism applies here as well.\n\t * @param {number} [amount] Amount of values to obtain from the end\n\t * @returns {*|Array<*>} A single value if no amount is provided or an array of values, starting from the start if\n\t * amount is negative\n\t */\n\tpublic last(): V | undefined;\n\tpublic last(amount: number): V[];\n\tpublic last(amount?: number): V | V[] | undefined {\n\t\tconst arr = this.array();\n\t\tif (typeof amount === 'undefined') return arr[arr.length - 1];\n\t\tif (amount < 0) return this.first(amount * -1);\n\t\tif (!amount) return [];\n\t\treturn arr.slice(-amount);\n\t}\n\n\t/**\n\t * Obtains the last key(s) in this collection. This relies on {@link Collection#keyArray}, and thus the caching\n\t * mechanism applies here as well.\n\t * @param {number} [amount] Amount of keys to obtain from the end\n\t * @returns {*|Array<*>} A single key if no amount is provided or an array of keys, starting from the start if\n\t * amount is negative\n\t */\n\tpublic lastKey(): K | undefined;\n\tpublic lastKey(amount: number): K[];\n\tpublic lastKey(amount?: number): K | K[] | undefined {\n\t\tconst arr = this.keyArray();\n\t\tif (typeof amount === 'undefined') return arr[arr.length - 1];\n\t\tif (amount < 0) return this.firstKey(amount * -1);\n\t\tif (!amount) return [];\n\t\treturn arr.slice(-amount);\n\t}\n\n\t/**\n\t * Obtains unique random value(s) from this collection. This relies on {@link Collection#array}, and thus the caching\n\t * mechanism applies here as well.\n\t * @param {number} [amount] Amount of values to obtain randomly\n\t * @returns {*|Array<*>} A single value if no amount is provided or an array of values\n\t */\n\tpublic random(): V;\n\tpublic random(amount: number): V[];\n\tpublic random(amount?: number): V | V[] {\n\t\tlet arr = this.array();\n\t\tif (typeof amount === 'undefined') return arr[Math.floor(Math.random() * arr.length)];\n\t\tif (arr.length === 0 || !amount) return [];\n\t\tarr = arr.slice();\n\t\treturn Array.from({ length: amount }, (): V => arr.splice(Math.floor(Math.random() * arr.length), 1)[0]);\n\t}\n\n\t/**\n\t * Obtains unique random key(s) from this collection. This relies on {@link Collection#keyArray}, and thus the caching\n\t * mechanism applies here as well.\n\t * @param {number} [amount] Amount of keys to obtain randomly\n\t * @returns {*|Array<*>} A single key if no amount is provided or an array\n\t */\n\tpublic randomKey(): K;\n\tpublic randomKey(amount: number): K[];\n\tpublic randomKey(amount?: number): K | K[] {\n\t\tlet arr = this.keyArray();\n\t\tif (typeof amount === 'undefined') return arr[Math.floor(Math.random() * arr.length)];\n\t\tif (arr.length === 0 || !amount) return [];\n\t\tarr = arr.slice();\n\t\treturn Array.from({ length: amount }, (): K => arr.splice(Math.floor(Math.random() * arr.length), 1)[0]);\n\t}\n\n\t/**\n\t * Searches for a single item where the given function returns a truthy value. This behaves like\n\t * [Array.find()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find).\n\t * <warn>All collections used in Discord.js are mapped using their `id` property, and if you want to find by id you\n\t * should use the `get` method. See\n\t * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/get) for details.</warn>\n\t * @param {Function} fn The function to test with (should return boolean)\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {*}\n\t * @example collection.find(user => user.username === 'Bob');\n\t */\n\tpublic find(fn: (value: V, key: K, collection: this) => boolean): V | undefined;\n\tpublic find<T>(fn: (this: T, value: V, key: K, collection: this) => boolean, thisArg: T): V | undefined;\n\tpublic find(fn: (value: V, key: K, collection: this) => boolean, thisArg?: unknown): V | undefined {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tfor (const [key, val] of this) {\n\t\t\tif (fn(val, key, this)) return val;\n\t\t}\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Searches for the key of a single item where the given function returns a truthy value. This behaves like\n\t * [Array.findIndex()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex),\n\t * but returns the key rather than the positional index.\n\t * @param {Function} fn The function to test with (should return boolean)\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {*}\n\t * @example collection.findKey(user => user.username === 'Bob');\n\t */\n\tpublic findKey(fn: (value: V, key: K, collection: this) => boolean): K | undefined;\n\tpublic findKey<T>(fn: (this: T, value: V, key: K, collection: this) => boolean, thisArg: T): K | undefined;\n\tpublic findKey(fn: (value: V, key: K, collection: this) => boolean, thisArg?: unknown): K | undefined {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tfor (const [key, val] of this) {\n\t\t\tif (fn(val, key, this)) return key;\n\t\t}\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Removes items that satisfy the provided filter function.\n\t * @param {Function} fn Function used to test (should return a boolean)\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {number} The number of removed entries\n\t */\n\tpublic sweep(fn: (value: V, key: K, collection: this) => boolean): number;\n\tpublic sweep<T>(fn: (this: T, value: V, key: K, collection: this) => boolean, thisArg: T): number;\n\tpublic sweep(fn: (value: V, key: K, collection: this) => boolean, thisArg?: unknown): number {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tconst previousSize = this.size;\n\t\tfor (const [key, val] of this) {\n\t\t\tif (fn(val, key, this)) this.delete(key);\n\t\t}\n\t\treturn previousSize - this.size;\n\t}\n\n\t/**\n\t * Identical to\n\t * [Array.filter()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter),\n\t * but returns a Collection instead of an Array.\n\t * @param {Function} fn The function to test with (should return boolean)\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {Collection}\n\t * @example collection.filter(user => user.username === 'Bob');\n\t */\n\tpublic filter(fn: (value: V, key: K, collection: this) => boolean): this;\n\tpublic filter<T>(fn: (this: T, value: V, key: K, collection: this) => boolean, thisArg: T): this;\n\tpublic filter(fn: (value: V, key: K, collection: this) => boolean, thisArg?: unknown): this {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tconst results = new this.constructor[Symbol.species]<K, V>() as this;\n\t\tfor (const [key, val] of this) {\n\t\t\tif (fn(val, key, this)) results.set(key, val);\n\t\t}\n\t\treturn results;\n\t}\n\n\t/**\n\t * Partitions the collection into two collections where the first collection\n\t * contains the items that passed and the second contains the items that failed.\n\t * @param {Function} fn Function used to test (should return a boolean)\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {Collection[]}\n\t * @example const [big, small] = collection.partition(guild => guild.memberCount > 250);\n\t */\n\tpublic partition(fn: (value: V, key: K, collection: this) => boolean): [this, this];\n\tpublic partition<T>(fn: (this: T, value: V, key: K, collection: this) => boolean, thisArg: T): [this, this];\n\tpublic partition(fn: (value: V, key: K, collection: this) => boolean, thisArg?: unknown): [this, this] {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\t// TODO: consider removing the <K, V> from the constructors after TS 3.7.0 is released, as it infers it\n\t\tconst results: [this, this] = [new this.constructor[Symbol.species]<K, V>() as this, new this.constructor[Symbol.species]<K, V>() as this];\n\t\tfor (const [key, val] of this) {\n\t\t\tif (fn(val, key, this)) {\n\t\t\t\tresults[0].set(key, val);\n\t\t\t} else {\n\t\t\t\tresults[1].set(key, val);\n\t\t\t}\n\t\t}\n\t\treturn results;\n\t}\n\n\t/**\n\t * Maps each item into a Collection, then joins the results into a single Collection. Identical in behavior to\n\t * [Array.flatMap()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap).\n\t * @param {Function} fn Function that produces a new Collection\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {Collection}\n\t * @example collection.flatMap(guild => guild.members.cache);\n\t */\n\tpublic flatMap<T>(fn: (value: V, key: K, collection: this) => Collection<K, T>): Collection<K, T>;\n\tpublic flatMap<T, This>(fn: (this: This, value: V, key: K, collection: this) => Collection<K, T>, thisArg: This): Collection<K, T>;\n\tpublic flatMap<T>(fn: (value: V, key: K, collection: this) => Collection<K, T>, thisArg?: unknown): Collection<K, T> {\n\t\tconst collections = this.map(fn, thisArg);\n\t\treturn (new this.constructor[Symbol.species]<K, T>() as Collection<K, T>).concat(...collections);\n\t}\n\n\t/**\n\t * Maps each item to another value into an array. Identical in behavior to\n\t * [Array.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map).\n\t * @param {Function} fn Function that produces an element of the new array, taking three arguments\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {Array}\n\t * @example collection.map(user => user.tag);\n\t */\n\tpublic map<T>(fn: (value: V, key: K, collection: this) => T): T[];\n\tpublic map<This, T>(fn: (this: This, value: V, key: K, collection: this) => T, thisArg: This): T[];\n\tpublic map<T>(fn: (value: V, key: K, collection: this) => T, thisArg?: unknown): T[] {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tconst iter = this.entries();\n\t\treturn Array.from({ length: this.size }, (): T => {\n\t\t\tconst [key, value] = iter.next().value;\n\t\t\treturn fn(value, key, this);\n\t\t});\n\t}\n\n\t/**\n\t * Maps each item to another value into a collection. Identical in behavior to\n\t * [Array.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map).\n\t * @param {Function} fn Function that produces an element of the new collection, taking three arguments\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {Collection}\n\t * @example collection.mapValues(user => user.tag);\n\t */\n\tpublic mapValues<T>(fn: (value: V, key: K, collection: this) => T): Collection<K, T>;\n\tpublic mapValues<This, T>(fn: (this: This, value: V, key: K, collection: this) => T, thisArg: This): Collection<K, T>;\n\tpublic mapValues<T>(fn: (value: V, key: K, collection: this) => T, thisArg?: unknown): Collection<K, T> {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tconst coll = new this.constructor[Symbol.species]<K, T>() as Collection<K, T>;\n\t\tfor (const [key, val] of this) coll.set(key, fn(val, key, this));\n\t\treturn coll;\n\t}\n\n\t/**\n\t * Checks if there exists an item that passes a test. Identical in behavior to\n\t * [Array.some()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some).\n\t * @param {Function} fn Function used to test (should return a boolean)\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {boolean}\n\t * @example collection.some(user => user.discriminator === '0000');\n\t */\n\tpublic some(fn: (value: V, key: K, collection: this) => boolean): boolean;\n\tpublic some<T>(fn: (this: T, value: V, key: K, collection: this) => boolean, thisArg: T): boolean;\n\tpublic some(fn: (value: V, key: K, collection: this) => boolean, thisArg?: unknown): boolean {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tfor (const [key, val] of this) {\n\t\t\tif (fn(val, key, this)) return true;\n\t\t}\n\t\treturn false;\n\t}\n\n\t/**\n\t * Checks if all items passes a test. Identical in behavior to\n\t * [Array.every()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every).\n\t * @param {Function} fn Function used to test (should return a boolean)\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {boolean}\n\t * @example collection.every(user => !user.bot);\n\t */\n\tpublic every(fn: (value: V, key: K, collection: this) => boolean): boolean;\n\tpublic every<T>(fn: (this: T, value: V, key: K, collection: this) => boolean, thisArg: T): boolean;\n\tpublic every(fn: (value: V, key: K, collection: this) => boolean, thisArg?: unknown): boolean {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tfor (const [key, val] of this) {\n\t\t\tif (!fn(val, key, this)) return false;\n\t\t}\n\t\treturn true;\n\t}\n\n\t/**\n\t * Applies a function to produce a single value. Identical in behavior to\n\t * [Array.reduce()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce).\n\t * @param {Function} fn Function used to reduce, taking four arguments; `accumulator`, `currentValue`, `currentKey`,\n\t * and `collection`\n\t * @param {*} [initialValue] Starting value for the accumulator\n\t * @returns {*}\n\t * @example collection.reduce((acc, guild) => acc + guild.memberCount, 0);\n\t */\n\tpublic reduce<T>(fn: (accumulator: T, value: V, key: K, collection: this) => T, initialValue?: T): T {\n\t\tlet accumulator!: T;\n\n\t\tif (typeof initialValue !== 'undefined') {\n\t\t\taccumulator = initialValue;\n\t\t\tfor (const [key, val] of this) accumulator = fn(accumulator, val, key, this);\n\t\t\treturn accumulator;\n\t\t}\n\t\tlet first = true;\n\t\tfor (const [key, val] of this) {\n\t\t\tif (first) {\n\t\t\t\taccumulator = val as unknown as T;\n\t\t\t\tfirst = false;\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\taccumulator = fn(accumulator, val, key, this);\n\t\t}\n\n\t\t// No items iterated.\n\t\tif (first) {\n\t\t\tthrow new TypeError('Reduce of empty collection with no initial value');\n\t\t}\n\n\t\treturn accumulator;\n\t}\n\n\t/**\n\t * Identical to\n\t * [Map.forEach()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach),\n\t * but returns the collection instead of undefined.\n\t * @param {Function} fn Function to execute for each element\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {Collection}\n\t * @example\n\t * collection\n\t *  .each(user => console.log(user.username))\n\t *  .filter(user => user.bot)\n\t *  .each(user => console.log(user.username));\n\t */\n\tpublic each(fn: (value: V, key: K, collection: this) => void): this;\n\tpublic each<T>(fn: (this: T, value: V, key: K, collection: this) => void, thisArg: T): this;\n\tpublic each(fn: (value: V, key: K, collection: this) => void, thisArg?: unknown): this {\n\t\tthis.forEach(fn as (value: V, key: K, map: Map<K, V>) => void, thisArg);\n\t\treturn this;\n\t}\n\n\t/**\n\t * Runs a function on the collection and returns the collection.\n\t * @param {Function} fn Function to execute\n\t * @param {*} [thisArg] Value to use as `this` when executing function\n\t * @returns {Collection}\n\t * @example\n\t * collection\n\t *  .tap(coll => console.log(coll.size))\n\t *  .filter(user => user.bot)\n\t *  .tap(coll => console.log(coll.size))\n\t */\n\tpublic tap(fn: (collection: this) => void): this;\n\tpublic tap<T>(fn: (this: T, collection: this) => void, thisArg: T): this;\n\tpublic tap(fn: (collection: this) => void, thisArg?: unknown): this {\n\t\tif (typeof thisArg !== 'undefined') fn = fn.bind(thisArg);\n\t\tfn(this);\n\t\treturn this;\n\t}\n\n\t/**\n\t * Creates an identical shallow copy of this collection.\n\t * @returns {Collection}\n\t * @example const newColl = someColl.clone();\n\t */\n\tpublic clone(): this {\n\t\treturn new this.constructor[Symbol.species](this) as this;\n\t}\n\n\t/**\n\t * Combines this collection with others into a new collection. None of the source collections are modified.\n\t * @param {...Collection} collections Collections to merge\n\t * @returns {Collection}\n\t * @example const newColl = someColl.concat(someOtherColl, anotherColl, ohBoyAColl);\n\t */\n\tpublic concat(...collections: Collection<K, V>[]): this {\n\t\tconst newColl = this.clone();\n\t\tfor (const coll of collections) {\n\t\t\tfor (const [key, val] of coll) newColl.set(key, val);\n\t\t}\n\t\treturn newColl;\n\t}\n\n\t/**\n\t * Checks if this collection shares identical items with another.\n\t * This is different to checking for equality using equal-signs, because\n\t * the collections may be different objects, but contain the same data.\n\t * @param {Collection} collection Collection to compare with\n\t * @returns {boolean} Whether the collections have identical contents\n\t */\n\tpublic equals(collection: Collection<K, V>): boolean {\n\t\tif (!collection) return false;\n\t\tif (this === collection) return true;\n\t\tif (this.size !== collection.size) return false;\n\t\tfor (const [key, value] of this) {\n\t\t\tif (!collection.has(key) || value !== collection.get(key)) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\t\treturn true;\n\t}\n\n\t/**\n\t * The sort method sorts the items of a collection in place and returns it.\n\t * The sort is not necessarily stable in Node 10 or older.\n\t * The default sort order is according to string Unicode code points.\n\t * @param {Function} [compareFunction] Specifies a function that defines the sort order.\n\t * If omitted, the collection is sorted according to each character's Unicode code point value,\n\t * according to the string conversion of each element.\n\t * @returns {Collection}\n\t * @example collection.sort((userA, userB) => userA.createdTimestamp - userB.createdTimestamp);\n\t */\n\tpublic sort(compareFunction: (firstValue: V, secondValue: V, firstKey: K, secondKey: K) => number = (x, y): number => Number(x > y) || Number(x === y) - 1): this {\n\t\tconst entries = [...this.entries()];\n\t\tentries.sort((a, b): number => compareFunction(a[1], b[1], a[0], b[0]));\n\n\t\t// Perform clean-up\n\t\tsuper.clear();\n\t\tthis._array = null;\n\t\tthis._keyArray = null;\n\n\t\t// Set the new entries\n\t\tfor (const [k, v] of entries) {\n\t\t\tsuper.set(k, v);\n\t\t}\n\t\treturn this;\n\t}\n\n\t/**\n\t * The intersect method returns a new structure containing items where the keys are present in both original structures.\n\t * @param {Collection} other The other Collection to filter against\n\t * @returns {Collection}\n\t */\n\tpublic intersect(other: Collection<K, V>): Collection<K, V> {\n\t\treturn other.filter((_, k) => this.has(k));\n\t}\n\n\t/**\n\t * The difference method returns a new structure containing items where the key is present in one of the original structures but not the other.\n\t * @param {Collection} other The other Collection to filter against\n\t * @returns {Collection}\n\t */\n\tpublic difference(other: Collection<K, V>): Collection<K, V> {\n\t\treturn other.filter((_, k) => !this.has(k)).concat(this.filter((_, k) => !other.has(k)));\n\t}\n\n\t/**\n\t * The sorted method sorts the items of a collection and returns it.\n\t * The sort is not necessarily stable in Node 10 or older.\n\t * The default sort order is according to string Unicode code points.\n\t * @param {Function} [compareFunction] Specifies a function that defines the sort order.\n\t * If omitted, the collection is sorted according to each character's Unicode code point value,\n\t * according to the string conversion of each element.\n\t * @returns {Collection}\n\t * @example collection.sorted((userA, userB) => userA.createdTimestamp - userB.createdTimestamp);\n\t */\n\tpublic sorted(compareFunction: (firstValue: V, secondValue: V, firstKey: K, secondKey: K) => number = (x, y): number => Number(x > y) || Number(x === y) - 1): this {\n\t\treturn (new this.constructor[Symbol.species]([...this.entries()]) as this)\n\t\t\t.sort((av, bv, ak, bk) => compareFunction(av, bv, ak, bk));\n\t}\n}\n\nmodule.exports = Collection;\nexport { Collection };\nexport default Collection;\n"]}