index.js (64633B)
1 "use strict"; 2 Object.defineProperty(exports, "__esModule", { value: true }); 3 /** 4 * A Map with additional utility methods. This is used throughout discord.js rather than Arrays for anything that has 5 * an ID, for significantly improved performance and ease-of-use. 6 * @extends {Map} 7 * @property {number} size - The amount of elements in this collection. 8 */ 9 class Collection extends Map { 10 constructor(entries) { 11 super(entries); 12 /** 13 * Cached array for the `array()` method - will be reset to `null` whenever `set()` or `delete()` are called 14 * @name Collection#_array 15 * @type {?Array} 16 * @private 17 */ 18 Object.defineProperty(this, '_array', { value: null, writable: true, configurable: true }); 19 /** 20 * Cached array for the `keyArray()` method - will be reset to `null` whenever `set()` or `delete()` are called 21 * @name Collection#_keyArray 22 * @type {?Array} 23 * @private 24 */ 25 Object.defineProperty(this, '_keyArray', { value: null, writable: true, configurable: true }); 26 } 27 /** 28 * Identical to [Map.get()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/get). 29 * Gets an element with the specified key, and returns its value, or `undefined` if the element does not exist. 30 * @param {*} key - The key to get from this collection 31 * @returns {* | undefined} 32 */ 33 get(key) { 34 return super.get(key); 35 } 36 /** 37 * Identical to [Map.set()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set). 38 * Sets a new element in the collection with the specified key and value. 39 * @param {*} key - The key of the element to add 40 * @param {*} value - The value of the element to add 41 * @returns {Collection} 42 */ 43 set(key, value) { 44 this._array = null; 45 this._keyArray = null; 46 return super.set(key, value); 47 } 48 /** 49 * Identical to [Map.has()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/has). 50 * Checks if an element exists in the collection. 51 * @param {*} key - The key of the element to check for 52 * @returns {boolean} `true` if the element exists, `false` if it does not exist. 53 */ 54 has(key) { 55 return super.has(key); 56 } 57 /** 58 * Identical to [Map.delete()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete). 59 * Deletes an element from the collection. 60 * @param {*} key - The key to delete from the collection 61 * @returns {boolean} `true` if the element was removed, `false` if the element does not exist. 62 */ 63 delete(key) { 64 this._array = null; 65 this._keyArray = null; 66 return super.delete(key); 67 } 68 /** 69 * Identical to [Map.clear()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear). 70 * Removes all elements from the collection. 71 * @returns {undefined} 72 */ 73 clear() { 74 return super.clear(); 75 } 76 /** 77 * Creates an ordered array of the values of this collection, and caches it internally. The array will only be 78 * reconstructed if an item is added to or removed from the collection, or if you change the length of the array 79 * itself. If you don't want this caching behavior, use `[...collection.values()]` or 80 * `Array.from(collection.values())` instead. 81 * @returns {Array} 82 */ 83 array() { 84 if (!this._array || this._array.length !== this.size) 85 this._array = [...this.values()]; 86 return this._array; 87 } 88 /** 89 * Creates an ordered array of the keys of this collection, and caches it internally. The array will only be 90 * reconstructed if an item is added to or removed from the collection, or if you change the length of the array 91 * itself. If you don't want this caching behavior, use `[...collection.keys()]` or 92 * `Array.from(collection.keys())` instead. 93 * @returns {Array} 94 */ 95 keyArray() { 96 if (!this._keyArray || this._keyArray.length !== this.size) 97 this._keyArray = [...this.keys()]; 98 return this._keyArray; 99 } 100 first(amount) { 101 if (typeof amount === 'undefined') 102 return this.values().next().value; 103 if (amount < 0) 104 return this.last(amount * -1); 105 amount = Math.min(this.size, amount); 106 const iter = this.values(); 107 return Array.from({ length: amount }, () => iter.next().value); 108 } 109 firstKey(amount) { 110 if (typeof amount === 'undefined') 111 return this.keys().next().value; 112 if (amount < 0) 113 return this.lastKey(amount * -1); 114 amount = Math.min(this.size, amount); 115 const iter = this.keys(); 116 return Array.from({ length: amount }, () => iter.next().value); 117 } 118 last(amount) { 119 const arr = this.array(); 120 if (typeof amount === 'undefined') 121 return arr[arr.length - 1]; 122 if (amount < 0) 123 return this.first(amount * -1); 124 if (!amount) 125 return []; 126 return arr.slice(-amount); 127 } 128 lastKey(amount) { 129 const arr = this.keyArray(); 130 if (typeof amount === 'undefined') 131 return arr[arr.length - 1]; 132 if (amount < 0) 133 return this.firstKey(amount * -1); 134 if (!amount) 135 return []; 136 return arr.slice(-amount); 137 } 138 random(amount) { 139 let arr = this.array(); 140 if (typeof amount === 'undefined') 141 return arr[Math.floor(Math.random() * arr.length)]; 142 if (arr.length === 0 || !amount) 143 return []; 144 arr = arr.slice(); 145 return Array.from({ length: amount }, () => arr.splice(Math.floor(Math.random() * arr.length), 1)[0]); 146 } 147 randomKey(amount) { 148 let arr = this.keyArray(); 149 if (typeof amount === 'undefined') 150 return arr[Math.floor(Math.random() * arr.length)]; 151 if (arr.length === 0 || !amount) 152 return []; 153 arr = arr.slice(); 154 return Array.from({ length: amount }, () => arr.splice(Math.floor(Math.random() * arr.length), 1)[0]); 155 } 156 find(fn, thisArg) { 157 if (typeof thisArg !== 'undefined') 158 fn = fn.bind(thisArg); 159 for (const [key, val] of this) { 160 if (fn(val, key, this)) 161 return val; 162 } 163 return undefined; 164 } 165 findKey(fn, thisArg) { 166 if (typeof thisArg !== 'undefined') 167 fn = fn.bind(thisArg); 168 for (const [key, val] of this) { 169 if (fn(val, key, this)) 170 return key; 171 } 172 return undefined; 173 } 174 sweep(fn, thisArg) { 175 if (typeof thisArg !== 'undefined') 176 fn = fn.bind(thisArg); 177 const previousSize = this.size; 178 for (const [key, val] of this) { 179 if (fn(val, key, this)) 180 this.delete(key); 181 } 182 return previousSize - this.size; 183 } 184 filter(fn, thisArg) { 185 if (typeof thisArg !== 'undefined') 186 fn = fn.bind(thisArg); 187 const results = new this.constructor[Symbol.species](); 188 for (const [key, val] of this) { 189 if (fn(val, key, this)) 190 results.set(key, val); 191 } 192 return results; 193 } 194 partition(fn, thisArg) { 195 if (typeof thisArg !== 'undefined') 196 fn = fn.bind(thisArg); 197 // TODO: consider removing the <K, V> from the constructors after TS 3.7.0 is released, as it infers it 198 const results = [new this.constructor[Symbol.species](), new this.constructor[Symbol.species]()]; 199 for (const [key, val] of this) { 200 if (fn(val, key, this)) { 201 results[0].set(key, val); 202 } 203 else { 204 results[1].set(key, val); 205 } 206 } 207 return results; 208 } 209 flatMap(fn, thisArg) { 210 const collections = this.map(fn, thisArg); 211 return new this.constructor[Symbol.species]().concat(...collections); 212 } 213 map(fn, thisArg) { 214 if (typeof thisArg !== 'undefined') 215 fn = fn.bind(thisArg); 216 const iter = this.entries(); 217 return Array.from({ length: this.size }, () => { 218 const [key, value] = iter.next().value; 219 return fn(value, key, this); 220 }); 221 } 222 mapValues(fn, thisArg) { 223 if (typeof thisArg !== 'undefined') 224 fn = fn.bind(thisArg); 225 const coll = new this.constructor[Symbol.species](); 226 for (const [key, val] of this) 227 coll.set(key, fn(val, key, this)); 228 return coll; 229 } 230 some(fn, thisArg) { 231 if (typeof thisArg !== 'undefined') 232 fn = fn.bind(thisArg); 233 for (const [key, val] of this) { 234 if (fn(val, key, this)) 235 return true; 236 } 237 return false; 238 } 239 every(fn, thisArg) { 240 if (typeof thisArg !== 'undefined') 241 fn = fn.bind(thisArg); 242 for (const [key, val] of this) { 243 if (!fn(val, key, this)) 244 return false; 245 } 246 return true; 247 } 248 /** 249 * Applies a function to produce a single value. Identical in behavior to 250 * [Array.reduce()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce). 251 * @param {Function} fn Function used to reduce, taking four arguments; `accumulator`, `currentValue`, `currentKey`, 252 * and `collection` 253 * @param {*} [initialValue] Starting value for the accumulator 254 * @returns {*} 255 * @example collection.reduce((acc, guild) => acc + guild.memberCount, 0); 256 */ 257 reduce(fn, initialValue) { 258 let accumulator; 259 if (typeof initialValue !== 'undefined') { 260 accumulator = initialValue; 261 for (const [key, val] of this) 262 accumulator = fn(accumulator, val, key, this); 263 return accumulator; 264 } 265 let first = true; 266 for (const [key, val] of this) { 267 if (first) { 268 accumulator = val; 269 first = false; 270 continue; 271 } 272 accumulator = fn(accumulator, val, key, this); 273 } 274 // No items iterated. 275 if (first) { 276 throw new TypeError('Reduce of empty collection with no initial value'); 277 } 278 return accumulator; 279 } 280 each(fn, thisArg) { 281 this.forEach(fn, thisArg); 282 return this; 283 } 284 tap(fn, thisArg) { 285 if (typeof thisArg !== 'undefined') 286 fn = fn.bind(thisArg); 287 fn(this); 288 return this; 289 } 290 /** 291 * Creates an identical shallow copy of this collection. 292 * @returns {Collection} 293 * @example const newColl = someColl.clone(); 294 */ 295 clone() { 296 return new this.constructor[Symbol.species](this); 297 } 298 /** 299 * Combines this collection with others into a new collection. None of the source collections are modified. 300 * @param {...Collection} collections Collections to merge 301 * @returns {Collection} 302 * @example const newColl = someColl.concat(someOtherColl, anotherColl, ohBoyAColl); 303 */ 304 concat(...collections) { 305 const newColl = this.clone(); 306 for (const coll of collections) { 307 for (const [key, val] of coll) 308 newColl.set(key, val); 309 } 310 return newColl; 311 } 312 /** 313 * Checks if this collection shares identical items with another. 314 * This is different to checking for equality using equal-signs, because 315 * the collections may be different objects, but contain the same data. 316 * @param {Collection} collection Collection to compare with 317 * @returns {boolean} Whether the collections have identical contents 318 */ 319 equals(collection) { 320 if (!collection) 321 return false; 322 if (this === collection) 323 return true; 324 if (this.size !== collection.size) 325 return false; 326 for (const [key, value] of this) { 327 if (!collection.has(key) || value !== collection.get(key)) { 328 return false; 329 } 330 } 331 return true; 332 } 333 /** 334 * The sort method sorts the items of a collection in place and returns it. 335 * The sort is not necessarily stable. The default sort order is according to string Unicode code points. 336 * @param {Function} [compareFunction] Specifies a function that defines the sort order. 337 * If omitted, the collection is sorted according to each character's Unicode code point value, 338 * according to the string conversion of each element. 339 * @returns {Collection} 340 * @example collection.sort((userA, userB) => userA.createdTimestamp - userB.createdTimestamp); 341 */ 342 sort(compareFunction = (x, y) => Number(x > y) || Number(x === y) - 1) { 343 const entries = [...this.entries()]; 344 entries.sort((a, b) => compareFunction(a[1], b[1], a[0], b[0])); 345 // Perform clean-up 346 super.clear(); 347 this._array = null; 348 this._keyArray = null; 349 // Set the new entries 350 for (const [k, v] of entries) { 351 super.set(k, v); 352 } 353 return this; 354 } 355 /** 356 * The intersect method returns a new structure containing items where the keys are present in both original structures. 357 * @param {Collection} other The other Collection to filter against 358 * @returns {Collection} 359 */ 360 intersect(other) { 361 return other.filter((_, k) => this.has(k)); 362 } 363 /** 364 * The difference method returns a new structure containing items where the key is present in one of the original structures but not the other. 365 * @param {Collection} other The other Collection to filter against 366 * @returns {Collection} 367 */ 368 difference(other) { 369 return other.filter((_, k) => !this.has(k)).concat(this.filter((_, k) => !other.has(k))); 370 } 371 /** 372 * The sorted method sorts the items of a collection and returns it. 373 * The sort is not necessarily stable. The default sort order is according to string Unicode code points. 374 * @param {Function} [compareFunction] Specifies a function that defines the sort order. 375 * If omitted, the collection is sorted according to each character's Unicode code point value, 376 * according to the string conversion of each element. 377 * @returns {Collection} 378 * @example collection.sorted((userA, userB) => userA.createdTimestamp - userB.createdTimestamp); 379 */ 380 sorted(compareFunction = (x, y) => Number(x > y) || Number(x === y) - 1) { 381 return new this.constructor[Symbol.species]([...this.entries()]) 382 .sort((av, bv, ak, bk) => compareFunction(av, bv, ak, bk)); 383 } 384 } 385 exports.Collection = Collection; 386 Collection.default = Collection; 387 exports.default = Collection; 388 module.exports = Collection; 389 //# 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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);\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. 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. 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\nexport { Collection };\nexport default Collection;\nmodule.exports = Collection;\n"]}