Current File : //usr/share/nodejs/@types/node/util.d.ts
/**
* The `util` module supports the needs of Node.js internal APIs. Many of the
* utilities are useful for application and module developers as well. To access
* it:
*
* ```js
* const util = require('util');
* ```
* @see [source](https://github.com/nodejs/node/blob/v18.x/lib/util.js)
*/
declare module "util" {
import * as types from "node:util/types";
export interface InspectOptions {
/**
* If `true`, object's non-enumerable symbols and properties are included in the formatted result.
* `WeakMap` and `WeakSet` entries are also included as well as user defined prototype properties (excluding method properties).
* @default false
*/
showHidden?: boolean | undefined;
/**
* Specifies the number of times to recurse while formatting object.
* This is useful for inspecting large objects.
* To recurse up to the maximum call stack size pass `Infinity` or `null`.
* @default 2
*/
depth?: number | null | undefined;
/**
* If `true`, the output is styled with ANSI color codes. Colors are customizable.
*/
colors?: boolean | undefined;
/**
* If `false`, `[util.inspect.custom](depth, opts, inspect)` functions are not invoked.
* @default true
*/
customInspect?: boolean | undefined;
/**
* If `true`, `Proxy` inspection includes the target and handler objects.
* @default false
*/
showProxy?: boolean | undefined;
/**
* Specifies the maximum number of `Array`, `TypedArray`, `WeakMap`, and `WeakSet` elements
* to include when formatting. Set to `null` or `Infinity` to show all elements.
* Set to `0` or negative to show no elements.
* @default 100
*/
maxArrayLength?: number | null | undefined;
/**
* Specifies the maximum number of characters to
* include when formatting. Set to `null` or `Infinity` to show all elements.
* Set to `0` or negative to show no characters.
* @default 10000
*/
maxStringLength?: number | null | undefined;
/**
* The length at which input values are split across multiple lines.
* Set to `Infinity` to format the input as a single line
* (in combination with `compact` set to `true` or any number >= `1`).
* @default 80
*/
breakLength?: number | undefined;
/**
* Setting this to `false` causes each object key
* to be displayed on a new line. It will also add new lines to text that is
* longer than `breakLength`. If set to a number, the most `n` inner elements
* are united on a single line as long as all properties fit into
* `breakLength`. Short array elements are also grouped together. Note that no
* text will be reduced below 16 characters, no matter the `breakLength` size.
* For more information, see the example below.
* @default true
*/
compact?: boolean | number | undefined;
/**
* If set to `true` or a function, all properties of an object, and `Set` and `Map`
* entries are sorted in the resulting string.
* If set to `true` the default sort is used.
* If set to a function, it is used as a compare function.
*/
sorted?: boolean | ((a: string, b: string) => number) | undefined;
/**
* If set to `true`, getters are going to be
* inspected as well. If set to `'get'` only getters without setter are going
* to be inspected. If set to `'set'` only getters having a corresponding
* setter are going to be inspected. This might cause side effects depending on
* the getter function.
* @default false
*/
getters?: "get" | "set" | boolean | undefined;
/**
* If set to `true`, an underscore is used to separate every three digits in all bigints and numbers.
* @default false
*/
numericSeparator?: boolean | undefined;
}
export type Style =
| "special"
| "number"
| "bigint"
| "boolean"
| "undefined"
| "null"
| "string"
| "symbol"
| "date"
| "regexp"
| "module";
export type CustomInspectFunction = (depth: number, options: InspectOptionsStylized) => any; // TODO: , inspect: inspect
export interface InspectOptionsStylized extends InspectOptions {
stylize(text: string, styleType: Style): string;
}
/**
* The `util.format()` method returns a formatted string using the first argument
* as a `printf`\-like format string which can contain zero or more format
* specifiers. Each specifier is replaced with the converted value from the
* corresponding argument. Supported specifiers are:
*
* If a specifier does not have a corresponding argument, it is not replaced:
*
* ```js
* util.format('%s:%s', 'foo');
* // Returns: 'foo:%s'
* ```
*
* Values that are not part of the format string are formatted using`util.inspect()` if their type is not `string`.
*
* If there are more arguments passed to the `util.format()` method than the
* number of specifiers, the extra arguments are concatenated to the returned
* string, separated by spaces:
*
* ```js
* util.format('%s:%s', 'foo', 'bar', 'baz');
* // Returns: 'foo:bar baz'
* ```
*
* If the first argument does not contain a valid format specifier, `util.format()`returns a string that is the concatenation of all arguments separated by spaces:
*
* ```js
* util.format(1, 2, 3);
* // Returns: '1 2 3'
* ```
*
* If only one argument is passed to `util.format()`, it is returned as it is
* without any formatting:
*
* ```js
* util.format('%% %s');
* // Returns: '%% %s'
* ```
*
* `util.format()` is a synchronous method that is intended as a debugging tool.
* Some input values can have a significant performance overhead that can block the
* event loop. Use this function with care and never in a hot code path.
* @since v0.5.3
* @param format A `printf`-like format string.
*/
export function format(format?: any, ...param: any[]): string;
/**
* This function is identical to {@link format}, except in that it takes
* an `inspectOptions` argument which specifies options that are passed along to {@link inspect}.
*
* ```js
* util.formatWithOptions({ colors: true }, 'See object %O', { foo: 42 });
* // Returns 'See object { foo: 42 }', where `42` is colored as a number
* // when printed to a terminal.
* ```
* @since v10.0.0
*/
export function formatWithOptions(inspectOptions: InspectOptions, format?: any, ...param: any[]): string;
/**
* Returns the string name for a numeric error code that comes from a Node.js API.
* The mapping between error codes and error names is platform-dependent.
* See `Common System Errors` for the names of common errors.
*
* ```js
* fs.access('file/that/does/not/exist', (err) => {
* const name = util.getSystemErrorName(err.errno);
* console.error(name); // ENOENT
* });
* ```
* @since v9.7.0
*/
export function getSystemErrorName(err: number): string;
/**
* Returns a Map of all system error codes available from the Node.js API.
* The mapping between error codes and error names is platform-dependent.
* See `Common System Errors` for the names of common errors.
*
* ```js
* fs.access('file/that/does/not/exist', (err) => {
* const errorMap = util.getSystemErrorMap();
* const name = errorMap.get(err.errno);
* console.error(name); // ENOENT
* });
* ```
* @since v16.0.0, v14.17.0
*/
export function getSystemErrorMap(): Map<number, [string, string]>;
/**
* The `util.log()` method prints the given `string` to `stdout` with an included
* timestamp.
*
* ```js
* const util = require('util');
*
* util.log('Timestamped message.');
* ```
* @since v0.3.0
* @deprecated Since v6.0.0 - Use a third party module instead.
*/
export function log(string: string): void;
/**
* Returns the `string` after replacing any surrogate code points
* (or equivalently, any unpaired surrogate code units) with the
* Unicode "replacement character" U+FFFD.
* @since v16.8.0, v14.18.0
*/
export function toUSVString(string: string): string;
/**
* Creates and returns an `AbortController` instance whose `AbortSignal` is marked
* as transferable and can be used with `structuredClone()` or `postMessage()`.
* @since v18.11.0
* @returns A transferable AbortController
*/
export function transferableAbortController(): AbortController;
/**
* Marks the given {AbortSignal} as transferable so that it can be used with
* `structuredClone()` and `postMessage()`.
*
* ```js
* const signal = transferableAbortSignal(AbortSignal.timeout(100));
* const channel = new MessageChannel();
* channel.port2.postMessage(signal, [signal]);
* ```
* @since v18.11.0
* @param signal The AbortSignal
* @returns The same AbortSignal
*/
export function transferableAbortSignal(signal: AbortSignal): AbortSignal;
/**
* Listens to abort event on the provided `signal` and returns a promise that is fulfilled when the `signal` is aborted.
* If the passed `resource` is garbage collected before the `signal` is aborted, the returned promise shall remain pending indefinitely.
* @param resource Any non-null entity, reference to which is held weakly.
*/
export function aborted(signal: AbortSignal, resource: any): Promise<void>;
/**
* The `util.inspect()` method returns a string representation of `object` that is
* intended for debugging. The output of `util.inspect` may change at any time
* and should not be depended upon programmatically. Additional `options` may be
* passed that alter the result.`util.inspect()` will use the constructor's name and/or `@@toStringTag` to make
* an identifiable tag for an inspected value.
*
* ```js
* class Foo {
* get [Symbol.toStringTag]() {
* return 'bar';
* }
* }
*
* class Bar {}
*
* const baz = Object.create(null, { [Symbol.toStringTag]: { value: 'foo' } });
*
* util.inspect(new Foo()); // 'Foo [bar] {}'
* util.inspect(new Bar()); // 'Bar {}'
* util.inspect(baz); // '[foo] {}'
* ```
*
* Circular references point to their anchor by using a reference index:
*
* ```js
* const { inspect } = require('util');
*
* const obj = {};
* obj.a = [obj];
* obj.b = {};
* obj.b.inner = obj.b;
* obj.b.obj = obj;
*
* console.log(inspect(obj));
* // <ref *1> {
* // a: [ [Circular *1] ],
* // b: <ref *2> { inner: [Circular *2], obj: [Circular *1] }
* // }
* ```
*
* The following example inspects all properties of the `util` object:
*
* ```js
* const util = require('util');
*
* console.log(util.inspect(util, { showHidden: true, depth: null }));
* ```
*
* The following example highlights the effect of the `compact` option:
*
* ```js
* const util = require('util');
*
* const o = {
* a: [1, 2, [[
* 'Lorem ipsum dolor sit amet,\nconsectetur adipiscing elit, sed do ' +
* 'eiusmod \ntempor incididunt ut labore et dolore magna aliqua.',
* 'test',
* 'foo']], 4],
* b: new Map([['za', 1], ['zb', 'test']])
* };
* console.log(util.inspect(o, { compact: true, depth: 5, breakLength: 80 }));
*
* // { a:
* // [ 1,
* // 2,
* // [ [ 'Lorem ipsum dolor sit amet,\nconsectetur [...]', // A long line
* // 'test',
* // 'foo' ] ],
* // 4 ],
* // b: Map(2) { 'za' => 1, 'zb' => 'test' } }
*
* // Setting `compact` to false or an integer creates more reader friendly output.
* console.log(util.inspect(o, { compact: false, depth: 5, breakLength: 80 }));
*
* // {
* // a: [
* // 1,
* // 2,
* // [
* // [
* // 'Lorem ipsum dolor sit amet,\n' +
* // 'consectetur adipiscing elit, sed do eiusmod \n' +
* // 'tempor incididunt ut labore et dolore magna aliqua.',
* // 'test',
* // 'foo'
* // ]
* // ],
* // 4
* // ],
* // b: Map(2) {
* // 'za' => 1,
* // 'zb' => 'test'
* // }
* // }
*
* // Setting `breakLength` to e.g. 150 will print the "Lorem ipsum" text in a
* // single line.
* ```
*
* The `showHidden` option allows [`WeakMap`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap) and
* [`WeakSet`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet) entries to be
* inspected. If there are more entries than `maxArrayLength`, there is no
* guarantee which entries are displayed. That means retrieving the same [`WeakSet`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet) entries twice may
* result in different output. Furthermore, entries
* with no remaining strong references may be garbage collected at any time.
*
* ```js
* const { inspect } = require('util');
*
* const obj = { a: 1 };
* const obj2 = { b: 2 };
* const weakSet = new WeakSet([obj, obj2]);
*
* console.log(inspect(weakSet, { showHidden: true }));
* // WeakSet { { a: 1 }, { b: 2 } }
* ```
*
* The `sorted` option ensures that an object's property insertion order does not
* impact the result of `util.inspect()`.
*
* ```js
* const { inspect } = require('util');
* const assert = require('assert');
*
* const o1 = {
* b: [2, 3, 1],
* a: '`a` comes before `b`',
* c: new Set([2, 3, 1])
* };
* console.log(inspect(o1, { sorted: true }));
* // { a: '`a` comes before `b`', b: [ 2, 3, 1 ], c: Set(3) { 1, 2, 3 } }
* console.log(inspect(o1, { sorted: (a, b) => b.localeCompare(a) }));
* // { c: Set(3) { 3, 2, 1 }, b: [ 2, 3, 1 ], a: '`a` comes before `b`' }
*
* const o2 = {
* c: new Set([2, 1, 3]),
* a: '`a` comes before `b`',
* b: [2, 3, 1]
* };
* assert.strict.equal(
* inspect(o1, { sorted: true }),
* inspect(o2, { sorted: true })
* );
* ```
*
* The `numericSeparator` option adds an underscore every three digits to all
* numbers.
*
* ```js
* const { inspect } = require('util');
*
* const thousand = 1_000;
* const million = 1_000_000;
* const bigNumber = 123_456_789n;
* const bigDecimal = 1_234.123_45;
*
* console.log(thousand, million, bigNumber, bigDecimal);
* // 1_000 1_000_000 123_456_789n 1_234.123_45
* ```
*
* `util.inspect()` is a synchronous method intended for debugging. Its maximum
* output length is approximately 128 MB. Inputs that result in longer output will
* be truncated.
* @since v0.3.0
* @param object Any JavaScript primitive or `Object`.
* @return The representation of `object`.
*/
export function inspect(object: any, showHidden?: boolean, depth?: number | null, color?: boolean): string;
export function inspect(object: any, options?: InspectOptions): string;
export namespace inspect {
let colors: NodeJS.Dict<[number, number]>;
let styles: {
[K in Style]: string;
};
let defaultOptions: InspectOptions;
/**
* Allows changing inspect settings from the repl.
*/
let replDefaults: InspectOptions;
/**
* That can be used to declare custom inspect functions.
*/
const custom: unique symbol;
}
/**
* Alias for [`Array.isArray()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray).
*
* Returns `true` if the given `object` is an `Array`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isArray([]);
* // Returns: true
* util.isArray(new Array());
* // Returns: true
* util.isArray({});
* // Returns: false
* ```
* @since v0.6.0
* @deprecated Since v4.0.0 - Use `isArray` instead.
*/
export function isArray(object: unknown): object is unknown[];
/**
* Returns `true` if the given `object` is a `RegExp`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isRegExp(/some regexp/);
* // Returns: true
* util.isRegExp(new RegExp('another regexp'));
* // Returns: true
* util.isRegExp({});
* // Returns: false
* ```
* @since v0.6.0
* @deprecated Since v4.0.0 - Deprecated
*/
export function isRegExp(object: unknown): object is RegExp;
/**
* Returns `true` if the given `object` is a `Date`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isDate(new Date());
* // Returns: true
* util.isDate(Date());
* // false (without 'new' returns a String)
* util.isDate({});
* // Returns: false
* ```
* @since v0.6.0
* @deprecated Since v4.0.0 - Use {@link types.isDate} instead.
*/
export function isDate(object: unknown): object is Date;
/**
* Returns `true` if the given `object` is an `Error`. Otherwise, returns`false`.
*
* ```js
* const util = require('util');
*
* util.isError(new Error());
* // Returns: true
* util.isError(new TypeError());
* // Returns: true
* util.isError({ name: 'Error', message: 'an error occurred' });
* // Returns: false
* ```
*
* This method relies on `Object.prototype.toString()` behavior. It is
* possible to obtain an incorrect result when the `object` argument manipulates`@@toStringTag`.
*
* ```js
* const util = require('util');
* const obj = { name: 'Error', message: 'an error occurred' };
*
* util.isError(obj);
* // Returns: false
* obj[Symbol.toStringTag] = 'Error';
* util.isError(obj);
* // Returns: true
* ```
* @since v0.6.0
* @deprecated Since v4.0.0 - Use {@link types.isNativeError} instead.
*/
export function isError(object: unknown): object is Error;
/**
* Usage of `util.inherits()` is discouraged. Please use the ES6 `class` and`extends` keywords to get language level inheritance support. Also note
* that the two styles are [semantically incompatible](https://github.com/nodejs/node/issues/4179).
*
* Inherit the prototype methods from one [constructor](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor) into another. The
* prototype of `constructor` will be set to a new object created from`superConstructor`.
*
* This mainly adds some input validation on top of`Object.setPrototypeOf(constructor.prototype, superConstructor.prototype)`.
* As an additional convenience, `superConstructor` will be accessible
* through the `constructor.super_` property.
*
* ```js
* const util = require('util');
* const EventEmitter = require('events');
*
* function MyStream() {
* EventEmitter.call(this);
* }
*
* util.inherits(MyStream, EventEmitter);
*
* MyStream.prototype.write = function(data) {
* this.emit('data', data);
* };
*
* const stream = new MyStream();
*
* console.log(stream instanceof EventEmitter); // true
* console.log(MyStream.super_ === EventEmitter); // true
*
* stream.on('data', (data) => {
* console.log(`Received data: "${data}"`);
* });
* stream.write('It works!'); // Received data: "It works!"
* ```
*
* ES6 example using `class` and `extends`:
*
* ```js
* const EventEmitter = require('events');
*
* class MyStream extends EventEmitter {
* write(data) {
* this.emit('data', data);
* }
* }
*
* const stream = new MyStream();
*
* stream.on('data', (data) => {
* console.log(`Received data: "${data}"`);
* });
* stream.write('With ES6');
* ```
* @since v0.3.0
* @legacy Use ES2015 class syntax and `extends` keyword instead.
*/
export function inherits(constructor: unknown, superConstructor: unknown): void;
export type DebugLoggerFunction = (msg: string, ...param: unknown[]) => void;
export interface DebugLogger extends DebugLoggerFunction {
enabled: boolean;
}
/**
* The `util.debuglog()` method is used to create a function that conditionally
* writes debug messages to `stderr` based on the existence of the `NODE_DEBUG`environment variable. If the `section` name appears within the value of that
* environment variable, then the returned function operates similar to `console.error()`. If not, then the returned function is a no-op.
*
* ```js
* const util = require('util');
* const debuglog = util.debuglog('foo');
*
* debuglog('hello from foo [%d]', 123);
* ```
*
* If this program is run with `NODE_DEBUG=foo` in the environment, then
* it will output something like:
*
* ```console
* FOO 3245: hello from foo [123]
* ```
*
* where `3245` is the process id. If it is not run with that
* environment variable set, then it will not print anything.
*
* The `section` supports wildcard also:
*
* ```js
* const util = require('util');
* const debuglog = util.debuglog('foo-bar');
*
* debuglog('hi there, it\'s foo-bar [%d]', 2333);
* ```
*
* if it is run with `NODE_DEBUG=foo*` in the environment, then it will output
* something like:
*
* ```console
* FOO-BAR 3257: hi there, it's foo-bar [2333]
* ```
*
* Multiple comma-separated `section` names may be specified in the `NODE_DEBUG`environment variable: `NODE_DEBUG=fs,net,tls`.
*
* The optional `callback` argument can be used to replace the logging function
* with a different function that doesn't have any initialization or
* unnecessary wrapping.
*
* ```js
* const util = require('util');
* let debuglog = util.debuglog('internals', (debug) => {
* // Replace with a logging function that optimizes out
* // testing if the section is enabled
* debuglog = debug;
* });
* ```
* @since v0.11.3
* @param section A string identifying the portion of the application for which the `debuglog` function is being created.
* @param callback A callback invoked the first time the logging function is called with a function argument that is a more optimized logging function.
* @return The logging function
*/
export function debuglog(section: string, callback?: (fn: DebugLoggerFunction) => void): DebugLogger;
export const debug: typeof debuglog;
/**
* Returns `true` if the given `object` is a `Boolean`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isBoolean(1);
* // Returns: false
* util.isBoolean(0);
* // Returns: false
* util.isBoolean(false);
* // Returns: true
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `typeof value === 'boolean'` instead.
*/
export function isBoolean(object: unknown): object is boolean;
/**
* Returns `true` if the given `object` is a `Buffer`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isBuffer({ length: 0 });
* // Returns: false
* util.isBuffer([]);
* // Returns: false
* util.isBuffer(Buffer.from('hello world'));
* // Returns: true
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `isBuffer` instead.
*/
export function isBuffer(object: unknown): object is Buffer;
/**
* Returns `true` if the given `object` is a `Function`. Otherwise, returns`false`.
*
* ```js
* const util = require('util');
*
* function Foo() {}
* const Bar = () => {};
*
* util.isFunction({});
* // Returns: false
* util.isFunction(Foo);
* // Returns: true
* util.isFunction(Bar);
* // Returns: true
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `typeof value === 'function'` instead.
*/
export function isFunction(object: unknown): boolean;
/**
* Returns `true` if the given `object` is strictly `null`. Otherwise, returns`false`.
*
* ```js
* const util = require('util');
*
* util.isNull(0);
* // Returns: false
* util.isNull(undefined);
* // Returns: false
* util.isNull(null);
* // Returns: true
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `value === null` instead.
*/
export function isNull(object: unknown): object is null;
/**
* Returns `true` if the given `object` is `null` or `undefined`. Otherwise,
* returns `false`.
*
* ```js
* const util = require('util');
*
* util.isNullOrUndefined(0);
* // Returns: false
* util.isNullOrUndefined(undefined);
* // Returns: true
* util.isNullOrUndefined(null);
* // Returns: true
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `value === undefined || value === null` instead.
*/
export function isNullOrUndefined(object: unknown): object is null | undefined;
/**
* Returns `true` if the given `object` is a `Number`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isNumber(false);
* // Returns: false
* util.isNumber(Infinity);
* // Returns: true
* util.isNumber(0);
* // Returns: true
* util.isNumber(NaN);
* // Returns: true
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `typeof value === 'number'` instead.
*/
export function isNumber(object: unknown): object is number;
/**
* Returns `true` if the given `object` is strictly an `Object`**and** not a`Function` (even though functions are objects in JavaScript).
* Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isObject(5);
* // Returns: false
* util.isObject(null);
* // Returns: false
* util.isObject({});
* // Returns: true
* util.isObject(() => {});
* // Returns: false
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Deprecated: Use `value !== null && typeof value === 'object'` instead.
*/
export function isObject(object: unknown): boolean;
/**
* Returns `true` if the given `object` is a primitive type. Otherwise, returns`false`.
*
* ```js
* const util = require('util');
*
* util.isPrimitive(5);
* // Returns: true
* util.isPrimitive('foo');
* // Returns: true
* util.isPrimitive(false);
* // Returns: true
* util.isPrimitive(null);
* // Returns: true
* util.isPrimitive(undefined);
* // Returns: true
* util.isPrimitive({});
* // Returns: false
* util.isPrimitive(() => {});
* // Returns: false
* util.isPrimitive(/^$/);
* // Returns: false
* util.isPrimitive(new Date());
* // Returns: false
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `(typeof value !== 'object' && typeof value !== 'function') || value === null` instead.
*/
export function isPrimitive(object: unknown): boolean;
/**
* Returns `true` if the given `object` is a `string`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isString('');
* // Returns: true
* util.isString('foo');
* // Returns: true
* util.isString(String('foo'));
* // Returns: true
* util.isString(5);
* // Returns: false
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `typeof value === 'string'` instead.
*/
export function isString(object: unknown): object is string;
/**
* Returns `true` if the given `object` is a `Symbol`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* util.isSymbol(5);
* // Returns: false
* util.isSymbol('foo');
* // Returns: false
* util.isSymbol(Symbol('foo'));
* // Returns: true
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `typeof value === 'symbol'` instead.
*/
export function isSymbol(object: unknown): object is symbol;
/**
* Returns `true` if the given `object` is `undefined`. Otherwise, returns `false`.
*
* ```js
* const util = require('util');
*
* const foo = undefined;
* util.isUndefined(5);
* // Returns: false
* util.isUndefined(foo);
* // Returns: true
* util.isUndefined(null);
* // Returns: false
* ```
* @since v0.11.5
* @deprecated Since v4.0.0 - Use `value === undefined` instead.
*/
export function isUndefined(object: unknown): object is undefined;
/**
* The `util.deprecate()` method wraps `fn` (which may be a function or class) in
* such a way that it is marked as deprecated.
*
* ```js
* const util = require('util');
*
* exports.obsoleteFunction = util.deprecate(() => {
* // Do something here.
* }, 'obsoleteFunction() is deprecated. Use newShinyFunction() instead.');
* ```
*
* When called, `util.deprecate()` will return a function that will emit a`DeprecationWarning` using the `'warning'` event. The warning will
* be emitted and printed to `stderr` the first time the returned function is
* called. After the warning is emitted, the wrapped function is called without
* emitting a warning.
*
* If the same optional `code` is supplied in multiple calls to `util.deprecate()`,
* the warning will be emitted only once for that `code`.
*
* ```js
* const util = require('util');
*
* const fn1 = util.deprecate(someFunction, someMessage, 'DEP0001');
* const fn2 = util.deprecate(someOtherFunction, someOtherMessage, 'DEP0001');
* fn1(); // Emits a deprecation warning with code DEP0001
* fn2(); // Does not emit a deprecation warning because it has the same code
* ```
*
* If either the `--no-deprecation` or `--no-warnings` command-line flags are
* used, or if the `process.noDeprecation` property is set to `true`_prior_ to
* the first deprecation warning, the `util.deprecate()` method does nothing.
*
* If the `--trace-deprecation` or `--trace-warnings` command-line flags are set,
* or the `process.traceDeprecation` property is set to `true`, a warning and a
* stack trace are printed to `stderr` the first time the deprecated function is
* called.
*
* If the `--throw-deprecation` command-line flag is set, or the`process.throwDeprecation` property is set to `true`, then an exception will be
* thrown when the deprecated function is called.
*
* The `--throw-deprecation` command-line flag and `process.throwDeprecation`property take precedence over `--trace-deprecation` and`process.traceDeprecation`.
* @since v0.8.0
* @param fn The function that is being deprecated.
* @param msg A warning message to display when the deprecated function is invoked.
* @param code A deprecation code. See the `list of deprecated APIs` for a list of codes.
* @return The deprecated function wrapped to emit a warning.
*/
export function deprecate<T extends Function>(fn: T, msg: string, code?: string): T;
/**
* Returns `true` if there is deep strict equality between `val1` and `val2`.
* Otherwise, returns `false`.
*
* See `assert.deepStrictEqual()` for more information about deep strict
* equality.
* @since v9.0.0
*/
export function isDeepStrictEqual(val1: unknown, val2: unknown): boolean;
/**
* Returns `str` with any ANSI escape codes removed.
*
* ```js
* console.log(util.stripVTControlCharacters('\u001B[4mvalue\u001B[0m'));
* // Prints "value"
* ```
* @since v16.11.0
*/
export function stripVTControlCharacters(str: string): string;
/**
* Takes an `async` function (or a function that returns a `Promise`) and returns a
* function following the error-first callback style, i.e. taking
* an `(err, value) => ...` callback as the last argument. In the callback, the
* first argument will be the rejection reason (or `null` if the `Promise`resolved), and the second argument will be the resolved value.
*
* ```js
* const util = require('util');
*
* async function fn() {
* return 'hello world';
* }
* const callbackFunction = util.callbackify(fn);
*
* callbackFunction((err, ret) => {
* if (err) throw err;
* console.log(ret);
* });
* ```
*
* Will print:
*
* ```text
* hello world
* ```
*
* The callback is executed asynchronously, and will have a limited stack trace.
* If the callback throws, the process will emit an `'uncaughtException'` event, and if not handled will exit.
*
* Since `null` has a special meaning as the first argument to a callback, if a
* wrapped function rejects a `Promise` with a falsy value as a reason, the value
* is wrapped in an `Error` with the original value stored in a field named`reason`.
*
* ```js
* function fn() {
* return Promise.reject(null);
* }
* const callbackFunction = util.callbackify(fn);
*
* callbackFunction((err, ret) => {
* // When the Promise was rejected with `null` it is wrapped with an Error and
* // the original value is stored in `reason`.
* err && Object.hasOwn(err, 'reason') && err.reason === null; // true
* });
* ```
* @since v8.2.0
* @param fn An `async` function
* @return a callback style function
*/
export function callbackify(fn: () => Promise<void>): (callback: (err: NodeJS.ErrnoException) => void) => void;
export function callbackify<TResult>(
fn: () => Promise<TResult>,
): (callback: (err: NodeJS.ErrnoException, result: TResult) => void) => void;
export function callbackify<T1>(
fn: (arg1: T1) => Promise<void>,
): (arg1: T1, callback: (err: NodeJS.ErrnoException) => void) => void;
export function callbackify<T1, TResult>(
fn: (arg1: T1) => Promise<TResult>,
): (arg1: T1, callback: (err: NodeJS.ErrnoException, result: TResult) => void) => void;
export function callbackify<T1, T2>(
fn: (arg1: T1, arg2: T2) => Promise<void>,
): (arg1: T1, arg2: T2, callback: (err: NodeJS.ErrnoException) => void) => void;
export function callbackify<T1, T2, TResult>(
fn: (arg1: T1, arg2: T2) => Promise<TResult>,
): (arg1: T1, arg2: T2, callback: (err: NodeJS.ErrnoException | null, result: TResult) => void) => void;
export function callbackify<T1, T2, T3>(
fn: (arg1: T1, arg2: T2, arg3: T3) => Promise<void>,
): (arg1: T1, arg2: T2, arg3: T3, callback: (err: NodeJS.ErrnoException) => void) => void;
export function callbackify<T1, T2, T3, TResult>(
fn: (arg1: T1, arg2: T2, arg3: T3) => Promise<TResult>,
): (arg1: T1, arg2: T2, arg3: T3, callback: (err: NodeJS.ErrnoException | null, result: TResult) => void) => void;
export function callbackify<T1, T2, T3, T4>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4) => Promise<void>,
): (arg1: T1, arg2: T2, arg3: T3, arg4: T4, callback: (err: NodeJS.ErrnoException) => void) => void;
export function callbackify<T1, T2, T3, T4, TResult>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4) => Promise<TResult>,
): (
arg1: T1,
arg2: T2,
arg3: T3,
arg4: T4,
callback: (err: NodeJS.ErrnoException | null, result: TResult) => void,
) => void;
export function callbackify<T1, T2, T3, T4, T5>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5) => Promise<void>,
): (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, callback: (err: NodeJS.ErrnoException) => void) => void;
export function callbackify<T1, T2, T3, T4, T5, TResult>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5) => Promise<TResult>,
): (
arg1: T1,
arg2: T2,
arg3: T3,
arg4: T4,
arg5: T5,
callback: (err: NodeJS.ErrnoException | null, result: TResult) => void,
) => void;
export function callbackify<T1, T2, T3, T4, T5, T6>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, arg6: T6) => Promise<void>,
): (
arg1: T1,
arg2: T2,
arg3: T3,
arg4: T4,
arg5: T5,
arg6: T6,
callback: (err: NodeJS.ErrnoException) => void,
) => void;
export function callbackify<T1, T2, T3, T4, T5, T6, TResult>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, arg6: T6) => Promise<TResult>,
): (
arg1: T1,
arg2: T2,
arg3: T3,
arg4: T4,
arg5: T5,
arg6: T6,
callback: (err: NodeJS.ErrnoException | null, result: TResult) => void,
) => void;
export interface CustomPromisifyLegacy<TCustom extends Function> extends Function {
__promisify__: TCustom;
}
export interface CustomPromisifySymbol<TCustom extends Function> extends Function {
[promisify.custom]: TCustom;
}
export type CustomPromisify<TCustom extends Function> =
| CustomPromisifySymbol<TCustom>
| CustomPromisifyLegacy<TCustom>;
/**
* Takes a function following the common error-first callback style, i.e. taking
* an `(err, value) => ...` callback as the last argument, and returns a version
* that returns promises.
*
* ```js
* const util = require('util');
* const fs = require('fs');
*
* const stat = util.promisify(fs.stat);
* stat('.').then((stats) => {
* // Do something with `stats`
* }).catch((error) => {
* // Handle the error.
* });
* ```
*
* Or, equivalently using `async function`s:
*
* ```js
* const util = require('util');
* const fs = require('fs');
*
* const stat = util.promisify(fs.stat);
*
* async function callStat() {
* const stats = await stat('.');
* console.log(`This directory is owned by ${stats.uid}`);
* }
* ```
*
* If there is an `original[util.promisify.custom]` property present, `promisify`will return its value, see `Custom promisified functions`.
*
* `promisify()` assumes that `original` is a function taking a callback as its
* final argument in all cases. If `original` is not a function, `promisify()`will throw an error. If `original` is a function but its last argument is not
* an error-first callback, it will still be passed an error-first
* callback as its last argument.
*
* Using `promisify()` on class methods or other methods that use `this` may not
* work as expected unless handled specially:
*
* ```js
* const util = require('util');
*
* class Foo {
* constructor() {
* this.a = 42;
* }
*
* bar(callback) {
* callback(null, this.a);
* }
* }
*
* const foo = new Foo();
*
* const naiveBar = util.promisify(foo.bar);
* // TypeError: Cannot read property 'a' of undefined
* // naiveBar().then(a => console.log(a));
*
* naiveBar.call(foo).then((a) => console.log(a)); // '42'
*
* const bindBar = naiveBar.bind(foo);
* bindBar().then((a) => console.log(a)); // '42'
* ```
* @since v8.0.0
*/
export function promisify<TCustom extends Function>(fn: CustomPromisify<TCustom>): TCustom;
export function promisify<TResult>(
fn: (callback: (err: any, result: TResult) => void) => void,
): () => Promise<TResult>;
export function promisify(fn: (callback: (err?: any) => void) => void): () => Promise<void>;
export function promisify<T1, TResult>(
fn: (arg1: T1, callback: (err: any, result: TResult) => void) => void,
): (arg1: T1) => Promise<TResult>;
export function promisify<T1>(fn: (arg1: T1, callback: (err?: any) => void) => void): (arg1: T1) => Promise<void>;
export function promisify<T1, T2, TResult>(
fn: (arg1: T1, arg2: T2, callback: (err: any, result: TResult) => void) => void,
): (arg1: T1, arg2: T2) => Promise<TResult>;
export function promisify<T1, T2>(
fn: (arg1: T1, arg2: T2, callback: (err?: any) => void) => void,
): (arg1: T1, arg2: T2) => Promise<void>;
export function promisify<T1, T2, T3, TResult>(
fn: (arg1: T1, arg2: T2, arg3: T3, callback: (err: any, result: TResult) => void) => void,
): (arg1: T1, arg2: T2, arg3: T3) => Promise<TResult>;
export function promisify<T1, T2, T3>(
fn: (arg1: T1, arg2: T2, arg3: T3, callback: (err?: any) => void) => void,
): (arg1: T1, arg2: T2, arg3: T3) => Promise<void>;
export function promisify<T1, T2, T3, T4, TResult>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, callback: (err: any, result: TResult) => void) => void,
): (arg1: T1, arg2: T2, arg3: T3, arg4: T4) => Promise<TResult>;
export function promisify<T1, T2, T3, T4>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, callback: (err?: any) => void) => void,
): (arg1: T1, arg2: T2, arg3: T3, arg4: T4) => Promise<void>;
export function promisify<T1, T2, T3, T4, T5, TResult>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, callback: (err: any, result: TResult) => void) => void,
): (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5) => Promise<TResult>;
export function promisify<T1, T2, T3, T4, T5>(
fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, callback: (err?: any) => void) => void,
): (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5) => Promise<void>;
export function promisify(fn: Function): Function;
export namespace promisify {
/**
* That can be used to declare custom promisified variants of functions.
*/
const custom: unique symbol;
}
/**
* An implementation of the [WHATWG Encoding Standard](https://encoding.spec.whatwg.org/) `TextDecoder` API.
*
* ```js
* const decoder = new TextDecoder();
* const u8arr = new Uint8Array([72, 101, 108, 108, 111]);
* console.log(decoder.decode(u8arr)); // Hello
* ```
* @since v8.3.0
*/
export class TextDecoder {
/**
* The encoding supported by the `TextDecoder` instance.
*/
readonly encoding: string;
/**
* The value will be `true` if decoding errors result in a `TypeError` being
* thrown.
*/
readonly fatal: boolean;
/**
* The value will be `true` if the decoding result will include the byte order
* mark.
*/
readonly ignoreBOM: boolean;
constructor(
encoding?: string,
options?: {
fatal?: boolean | undefined;
ignoreBOM?: boolean | undefined;
},
);
/**
* Decodes the `input` and returns a string. If `options.stream` is `true`, any
* incomplete byte sequences occurring at the end of the `input` are buffered
* internally and emitted after the next call to `textDecoder.decode()`.
*
* If `textDecoder.fatal` is `true`, decoding errors that occur will result in a`TypeError` being thrown.
* @param input An `ArrayBuffer`, `DataView` or `TypedArray` instance containing the encoded data.
*/
decode(
input?: NodeJS.ArrayBufferView | ArrayBuffer | null,
options?: {
stream?: boolean | undefined;
},
): string;
}
export interface EncodeIntoResult {
/**
* The read Unicode code units of input.
*/
read: number;
/**
* The written UTF-8 bytes of output.
*/
written: number;
}
export { types };
//// TextEncoder/Decoder
/**
* An implementation of the [WHATWG Encoding Standard](https://encoding.spec.whatwg.org/) `TextEncoder` API. All
* instances of `TextEncoder` only support UTF-8 encoding.
*
* ```js
* const encoder = new TextEncoder();
* const uint8array = encoder.encode('this is some data');
* ```
*
* The `TextEncoder` class is also available on the global object.
* @since v8.3.0
*/
export class TextEncoder {
/**
* The encoding supported by the `TextEncoder` instance. Always set to `'utf-8'`.
*/
readonly encoding: string;
/**
* UTF-8 encodes the `input` string and returns a `Uint8Array` containing the
* encoded bytes.
* @param [input='an empty string'] The text to encode.
*/
encode(input?: string): Uint8Array;
/**
* UTF-8 encodes the `src` string to the `dest` Uint8Array and returns an object
* containing the read Unicode code units and written UTF-8 bytes.
*
* ```js
* const encoder = new TextEncoder();
* const src = 'this is some data';
* const dest = new Uint8Array(10);
* const { read, written } = encoder.encodeInto(src, dest);
* ```
* @param src The text to encode.
* @param dest The array to hold the encode result.
*/
encodeInto(src: string, dest: Uint8Array): EncodeIntoResult;
}
import { TextDecoder as _TextDecoder, TextEncoder as _TextEncoder } from "util";
global {
/**
* `TextDecoder` class is a global reference for `require('util').TextDecoder`
* https://nodejs.org/api/globals.html#textdecoder
* @since v11.0.0
*/
var TextDecoder: typeof globalThis extends {
onmessage: any;
TextDecoder: infer TextDecoder;
} ? TextDecoder
: typeof _TextDecoder;
/**
* `TextEncoder` class is a global reference for `require('util').TextEncoder`
* https://nodejs.org/api/globals.html#textencoder
* @since v11.0.0
*/
var TextEncoder: typeof globalThis extends {
onmessage: any;
TextEncoder: infer TextEncoder;
} ? TextEncoder
: typeof _TextEncoder;
}
//// parseArgs
/**
* Provides a high-level API for command-line argument parsing. Takes a
* specification for the expected arguments and returns a structured object
* with the parsed values and positionals.
*
* `config` provides arguments for parsing and configures the parser. It
* supports the following properties:
*
* - `args` The array of argument strings. **Default:** `process.argv` with
* `execPath` and `filename` removed.
* - `options` Arguments known to the parser. Keys of `options` are the long
* names of options and values are objects accepting the following properties:
*
* - `type` Type of argument, which must be either `boolean` (for options
* which do not take values) or `string` (for options which do).
* - `multiple` Whether this option can be provided multiple
* times. If `true`, all values will be collected in an array. If
* `false`, values for the option are last-wins. **Default:** `false`.
* - `short` A single character alias for the option.
* - `default` The default option value when it is not set by args. It
* must be of the same type as the `type` property. When `multiple`
* is `true`, it must be an array.
*
* - `strict`: Whether an error should be thrown when unknown arguments
* are encountered, or when arguments are passed that do not match the
* `type` configured in `options`. **Default:** `true`.
* - `allowPositionals`: Whether this command accepts positional arguments.
* **Default:** `false` if `strict` is `true`, otherwise `true`.
* - `tokens`: Whether tokens {boolean} Return the parsed tokens. This is useful
* for extending the built-in behavior, from adding additional checks through
* to reprocessing the tokens in different ways.
* **Default:** `false`.
*
* @returns The parsed command line arguments:
*
* - `values` A mapping of parsed option names with their string
* or boolean values.
* - `positionals` Positional arguments.
* - `tokens` Detailed parse information (only if `tokens` was specified).
*/
export function parseArgs<T extends ParseArgsConfig>(config?: T): ParsedResults<T>;
interface ParseArgsOptionConfig {
/**
* Type of argument.
*/
type: "string" | "boolean";
/**
* Whether this option can be provided multiple times.
* If `true`, all values will be collected in an array.
* If `false`, values for the option are last-wins.
* @default false.
*/
multiple?: boolean | undefined;
/**
* A single character alias for the option.
*/
short?: string | undefined;
/**
* The default option value when it is not set by args.
* It must be of the same type as the the `type` property.
* When `multiple` is `true`, it must be an array.
* @since v18.11.0
*/
default?: string | boolean | string[] | boolean[] | undefined;
}
interface ParseArgsOptionsConfig {
[longOption: string]: ParseArgsOptionConfig;
}
export interface ParseArgsConfig {
/**
* Array of argument strings.
*/
args?: string[] | undefined;
/**
* Used to describe arguments known to the parser.
*/
options?: ParseArgsOptionsConfig | undefined;
/**
* Should an error be thrown when unknown arguments are encountered,
* or when arguments are passed that do not match the `type` configured in `options`.
* @default true
*/
strict?: boolean | undefined;
/**
* Whether this command accepts positional arguments.
*/
allowPositionals?: boolean | undefined;
/**
* Return the parsed tokens. This is useful for extending the built-in behavior,
* from adding additional checks through to reprocessing the tokens in different ways.
* @default false
*/
tokens?: boolean | undefined;
}
/*
IfDefaultsTrue and IfDefaultsFalse are helpers to handle default values for missing boolean properties.
TypeScript does not have exact types for objects: https://github.com/microsoft/TypeScript/issues/12936
This means it is impossible to distinguish between "field X is definitely not present" and "field X may or may not be present".
But we expect users to generally provide their config inline or `as const`, which means TS will always know whether a given field is present.
So this helper treats "not definitely present" (i.e., not `extends boolean`) as being "definitely not present", i.e. it should have its default value.
This is technically incorrect but is a much nicer UX for the common case.
The IfDefaultsTrue version is for things which default to true; the IfDefaultsFalse version is for things which default to false.
*/
type IfDefaultsTrue<T, IfTrue, IfFalse> = T extends true ? IfTrue
: T extends false ? IfFalse
: IfTrue;
// we put the `extends false` condition first here because `undefined` compares like `any` when `strictNullChecks: false`
type IfDefaultsFalse<T, IfTrue, IfFalse> = T extends false ? IfFalse
: T extends true ? IfTrue
: IfFalse;
type ExtractOptionValue<T extends ParseArgsConfig, O extends ParseArgsOptionConfig> = IfDefaultsTrue<
T["strict"],
O["type"] extends "string" ? string : O["type"] extends "boolean" ? boolean : string | boolean,
string | boolean
>;
type ParsedValues<T extends ParseArgsConfig> =
& IfDefaultsTrue<T["strict"], unknown, { [longOption: string]: undefined | string | boolean }>
& (T["options"] extends ParseArgsOptionsConfig ? {
-readonly [LongOption in keyof T["options"]]: IfDefaultsFalse<
T["options"][LongOption]["multiple"],
undefined | Array<ExtractOptionValue<T, T["options"][LongOption]>>,
undefined | ExtractOptionValue<T, T["options"][LongOption]>
>;
}
: {});
type ParsedPositionals<T extends ParseArgsConfig> = IfDefaultsTrue<
T["strict"],
IfDefaultsFalse<T["allowPositionals"], string[], []>,
IfDefaultsTrue<T["allowPositionals"], string[], []>
>;
type PreciseTokenForOptions<
K extends string,
O extends ParseArgsOptionConfig,
> = O["type"] extends "string" ? {
kind: "option";
index: number;
name: K;
rawName: string;
value: string;
inlineValue: boolean;
}
: O["type"] extends "boolean" ? {
kind: "option";
index: number;
name: K;
rawName: string;
value: undefined;
inlineValue: undefined;
}
: OptionToken & { name: K };
type TokenForOptions<
T extends ParseArgsConfig,
K extends keyof T["options"] = keyof T["options"],
> = K extends unknown
? T["options"] extends ParseArgsOptionsConfig ? PreciseTokenForOptions<K & string, T["options"][K]>
: OptionToken
: never;
type ParsedOptionToken<T extends ParseArgsConfig> = IfDefaultsTrue<T["strict"], TokenForOptions<T>, OptionToken>;
type ParsedPositionalToken<T extends ParseArgsConfig> = IfDefaultsTrue<
T["strict"],
IfDefaultsFalse<T["allowPositionals"], { kind: "positional"; index: number; value: string }, never>,
IfDefaultsTrue<T["allowPositionals"], { kind: "positional"; index: number; value: string }, never>
>;
type ParsedTokens<T extends ParseArgsConfig> = Array<
ParsedOptionToken<T> | ParsedPositionalToken<T> | { kind: "option-terminator"; index: number }
>;
type PreciseParsedResults<T extends ParseArgsConfig> = IfDefaultsFalse<
T["tokens"],
{
values: ParsedValues<T>;
positionals: ParsedPositionals<T>;
tokens: ParsedTokens<T>;
},
{
values: ParsedValues<T>;
positionals: ParsedPositionals<T>;
}
>;
type OptionToken =
| { kind: "option"; index: number; name: string; rawName: string; value: string; inlineValue: boolean }
| {
kind: "option";
index: number;
name: string;
rawName: string;
value: undefined;
inlineValue: undefined;
};
type Token =
| OptionToken
| { kind: "positional"; index: number; value: string }
| { kind: "option-terminator"; index: number };
// If ParseArgsConfig extends T, then the user passed config constructed elsewhere.
// So we can't rely on the `"not definitely present" implies "definitely not present"` assumption mentioned above.
type ParsedResults<T extends ParseArgsConfig> = ParseArgsConfig extends T ? {
values: { [longOption: string]: undefined | string | boolean | Array<string | boolean> };
positionals: string[];
tokens?: Token[];
}
: PreciseParsedResults<T>;
/**
* @since v18.13.0
*/
export class MIMEType {
/**
* Creates a new MIMEType object by parsing the input.
*
* A `TypeError` will be thrown if the `input` is not a valid MIME.
* Note that an effort will be made to coerce the given values into strings.
* @param input The input MIME to parse.
*/
constructor(input: string | { toString: () => string });
/**
* Gets and sets the type portion of the MIME.
*/
type: string;
/**
* Gets and sets the subtype portion of the MIME.
*/
subtype: string;
/**
* Gets the essence of the MIME.
*
* Use `mime.type` or `mime.subtype` to alter the MIME.
*/
readonly essence: string;
/**
* Gets the `MIMEParams` object representing the parameters of the MIME.
*/
readonly params: MIMEParams;
/**
* Returns the serialized MIME.
*
* Because of the need for standard compliance, this method
* does not allow users to customize the serialization process of the MIME.
*/
toString(): string;
}
/**
* @since v18.13.0
*/
export class MIMEParams {
/**
* Remove all name-value pairs whose name is `name`.
*/
delete(name: string): void;
/**
* Returns an iterator over each of the name-value pairs in the parameters.
*/
entries(): IterableIterator<[name: string, value: string]>;
/**
* Returns the value of the first name-value pair whose name is `name`.
* If there are no such pairs, `null` is returned.
*/
get(name: string): string | null;
/**
* Returns `true` if there is at least one name-value pair whose name is `name`.
*/
has(name: string): boolean;
/**
* Returns an iterator over the names of each name-value pair.
*/
keys(): IterableIterator<string>;
/**
* Sets the value in the `MIMEParams` object associated with `name` to `value`.
* If there are any pre-existing name-value pairs whose names are `name`,
* set the first such pair's value to `value`.
*/
set(name: string, value: string): void;
/**
* Returns an iterator over the values of each name-value pair.
*/
values(): IterableIterator<string>;
/**
* Returns an iterator over each of the name-value pairs in the parameters.
*/
[Symbol.iterator]: typeof MIMEParams.prototype.entries;
}
}
declare module "util/types" {
export * from "util/types";
}
declare module "util/types" {
import { KeyObject, webcrypto } from "node:crypto";
/**
* Returns `true` if the value is a built-in [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) or
* [`SharedArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) instance.
*
* See also `util.types.isArrayBuffer()` and `util.types.isSharedArrayBuffer()`.
*
* ```js
* util.types.isAnyArrayBuffer(new ArrayBuffer()); // Returns true
* util.types.isAnyArrayBuffer(new SharedArrayBuffer()); // Returns true
* ```
* @since v10.0.0
*/
function isAnyArrayBuffer(object: unknown): object is ArrayBufferLike;
/**
* Returns `true` if the value is an `arguments` object.
*
* ```js
* function foo() {
* util.types.isArgumentsObject(arguments); // Returns true
* }
* ```
* @since v10.0.0
*/
function isArgumentsObject(object: unknown): object is IArguments;
/**
* Returns `true` if the value is a built-in [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) instance.
* This does _not_ include [`SharedArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) instances. Usually, it is
* desirable to test for both; See `util.types.isAnyArrayBuffer()` for that.
*
* ```js
* util.types.isArrayBuffer(new ArrayBuffer()); // Returns true
* util.types.isArrayBuffer(new SharedArrayBuffer()); // Returns false
* ```
* @since v10.0.0
*/
function isArrayBuffer(object: unknown): object is ArrayBuffer;
/**
* Returns `true` if the value is an instance of one of the [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) views, such as typed
* array objects or [`DataView`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView). Equivalent to
* [`ArrayBuffer.isView()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView).
*
* ```js
* util.types.isArrayBufferView(new Int8Array()); // true
* util.types.isArrayBufferView(Buffer.from('hello world')); // true
* util.types.isArrayBufferView(new DataView(new ArrayBuffer(16))); // true
* util.types.isArrayBufferView(new ArrayBuffer()); // false
* ```
* @since v10.0.0
*/
function isArrayBufferView(object: unknown): object is NodeJS.ArrayBufferView;
/**
* Returns `true` if the value is an [async function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function).
* This only reports back what the JavaScript engine is seeing;
* in particular, the return value may not match the original source code if
* a transpilation tool was used.
*
* ```js
* util.types.isAsyncFunction(function foo() {}); // Returns false
* util.types.isAsyncFunction(async function foo() {}); // Returns true
* ```
* @since v10.0.0
*/
function isAsyncFunction(object: unknown): boolean;
/**
* Returns `true` if the value is a `BigInt64Array` instance.
*
* ```js
* util.types.isBigInt64Array(new BigInt64Array()); // Returns true
* util.types.isBigInt64Array(new BigUint64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isBigInt64Array(value: unknown): value is BigInt64Array;
/**
* Returns `true` if the value is a `BigUint64Array` instance.
*
* ```js
* util.types.isBigUint64Array(new BigInt64Array()); // Returns false
* util.types.isBigUint64Array(new BigUint64Array()); // Returns true
* ```
* @since v10.0.0
*/
function isBigUint64Array(value: unknown): value is BigUint64Array;
/**
* Returns `true` if the value is a boolean object, e.g. created
* by `new Boolean()`.
*
* ```js
* util.types.isBooleanObject(false); // Returns false
* util.types.isBooleanObject(true); // Returns false
* util.types.isBooleanObject(new Boolean(false)); // Returns true
* util.types.isBooleanObject(new Boolean(true)); // Returns true
* util.types.isBooleanObject(Boolean(false)); // Returns false
* util.types.isBooleanObject(Boolean(true)); // Returns false
* ```
* @since v10.0.0
*/
function isBooleanObject(object: unknown): object is Boolean;
/**
* Returns `true` if the value is any boxed primitive object, e.g. created
* by `new Boolean()`, `new String()` or `Object(Symbol())`.
*
* For example:
*
* ```js
* util.types.isBoxedPrimitive(false); // Returns false
* util.types.isBoxedPrimitive(new Boolean(false)); // Returns true
* util.types.isBoxedPrimitive(Symbol('foo')); // Returns false
* util.types.isBoxedPrimitive(Object(Symbol('foo'))); // Returns true
* util.types.isBoxedPrimitive(Object(BigInt(5))); // Returns true
* ```
* @since v10.11.0
*/
function isBoxedPrimitive(object: unknown): object is String | Number | BigInt | Boolean | Symbol;
/**
* Returns `true` if the value is a built-in [`DataView`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView) instance.
*
* ```js
* const ab = new ArrayBuffer(20);
* util.types.isDataView(new DataView(ab)); // Returns true
* util.types.isDataView(new Float64Array()); // Returns false
* ```
*
* See also [`ArrayBuffer.isView()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView).
* @since v10.0.0
*/
function isDataView(object: unknown): object is DataView;
/**
* Returns `true` if the value is a built-in [`Date`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date) instance.
*
* ```js
* util.types.isDate(new Date()); // Returns true
* ```
* @since v10.0.0
*/
function isDate(object: unknown): object is Date;
/**
* Returns `true` if the value is a native `External` value.
*
* A native `External` value is a special type of object that contains a
* raw C++ pointer (`void*`) for access from native code, and has no other
* properties. Such objects are created either by Node.js internals or native
* addons. In JavaScript, they are [frozen](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze) objects with a`null` prototype.
*
* ```c
* #include <js_native_api.h>
* #include <stdlib.h>
* napi_value result;
* static napi_value MyNapi(napi_env env, napi_callback_info info) {
* int* raw = (int*) malloc(1024);
* napi_status status = napi_create_external(env, (void*) raw, NULL, NULL, &result);
* if (status != napi_ok) {
* napi_throw_error(env, NULL, "napi_create_external failed");
* return NULL;
* }
* return result;
* }
* ...
* DECLARE_NAPI_PROPERTY("myNapi", MyNapi)
* ...
* ```
*
* ```js
* const native = require('napi_addon.node');
* const data = native.myNapi();
* util.types.isExternal(data); // returns true
* util.types.isExternal(0); // returns false
* util.types.isExternal(new String('foo')); // returns false
* ```
*
* For further information on `napi_create_external`, refer to `napi_create_external()`.
* @since v10.0.0
*/
function isExternal(object: unknown): boolean;
/**
* Returns `true` if the value is a built-in [`Float32Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array) instance.
*
* ```js
* util.types.isFloat32Array(new ArrayBuffer()); // Returns false
* util.types.isFloat32Array(new Float32Array()); // Returns true
* util.types.isFloat32Array(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isFloat32Array(object: unknown): object is Float32Array;
/**
* Returns `true` if the value is a built-in [`Float64Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float64Array) instance.
*
* ```js
* util.types.isFloat64Array(new ArrayBuffer()); // Returns false
* util.types.isFloat64Array(new Uint8Array()); // Returns false
* util.types.isFloat64Array(new Float64Array()); // Returns true
* ```
* @since v10.0.0
*/
function isFloat64Array(object: unknown): object is Float64Array;
/**
* Returns `true` if the value is a generator function.
* This only reports back what the JavaScript engine is seeing;
* in particular, the return value may not match the original source code if
* a transpilation tool was used.
*
* ```js
* util.types.isGeneratorFunction(function foo() {}); // Returns false
* util.types.isGeneratorFunction(function* foo() {}); // Returns true
* ```
* @since v10.0.0
*/
function isGeneratorFunction(object: unknown): object is GeneratorFunction;
/**
* Returns `true` if the value is a generator object as returned from a
* built-in generator function.
* This only reports back what the JavaScript engine is seeing;
* in particular, the return value may not match the original source code if
* a transpilation tool was used.
*
* ```js
* function* foo() {}
* const generator = foo();
* util.types.isGeneratorObject(generator); // Returns true
* ```
* @since v10.0.0
*/
function isGeneratorObject(object: unknown): object is Generator;
/**
* Returns `true` if the value is a built-in [`Int8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int8Array) instance.
*
* ```js
* util.types.isInt8Array(new ArrayBuffer()); // Returns false
* util.types.isInt8Array(new Int8Array()); // Returns true
* util.types.isInt8Array(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isInt8Array(object: unknown): object is Int8Array;
/**
* Returns `true` if the value is a built-in [`Int16Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int16Array) instance.
*
* ```js
* util.types.isInt16Array(new ArrayBuffer()); // Returns false
* util.types.isInt16Array(new Int16Array()); // Returns true
* util.types.isInt16Array(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isInt16Array(object: unknown): object is Int16Array;
/**
* Returns `true` if the value is a built-in [`Int32Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int32Array) instance.
*
* ```js
* util.types.isInt32Array(new ArrayBuffer()); // Returns false
* util.types.isInt32Array(new Int32Array()); // Returns true
* util.types.isInt32Array(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isInt32Array(object: unknown): object is Int32Array;
/**
* Returns `true` if the value is a built-in [`Map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map) instance.
*
* ```js
* util.types.isMap(new Map()); // Returns true
* ```
* @since v10.0.0
*/
function isMap<T>(
object: T | {},
): object is T extends ReadonlyMap<any, any> ? (unknown extends T ? never : ReadonlyMap<any, any>)
: Map<unknown, unknown>;
/**
* Returns `true` if the value is an iterator returned for a built-in [`Map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map) instance.
*
* ```js
* const map = new Map();
* util.types.isMapIterator(map.keys()); // Returns true
* util.types.isMapIterator(map.values()); // Returns true
* util.types.isMapIterator(map.entries()); // Returns true
* util.types.isMapIterator(map[Symbol.iterator]()); // Returns true
* ```
* @since v10.0.0
*/
function isMapIterator(object: unknown): boolean;
/**
* Returns `true` if the value is an instance of a [Module Namespace Object](https://tc39.github.io/ecma262/#sec-module-namespace-exotic-objects).
*
* ```js
* import * as ns from './a.js';
*
* util.types.isModuleNamespaceObject(ns); // Returns true
* ```
* @since v10.0.0
*/
function isModuleNamespaceObject(value: unknown): boolean;
/**
* Returns `true` if the value is an instance of a built-in `Error` type.
*
* ```js
* util.types.isNativeError(new Error()); // Returns true
* util.types.isNativeError(new TypeError()); // Returns true
* util.types.isNativeError(new RangeError()); // Returns true
* ```
* @since v10.0.0
*/
function isNativeError(object: unknown): object is Error;
/**
* Returns `true` if the value is a number object, e.g. created
* by `new Number()`.
*
* ```js
* util.types.isNumberObject(0); // Returns false
* util.types.isNumberObject(new Number(0)); // Returns true
* ```
* @since v10.0.0
*/
function isNumberObject(object: unknown): object is Number;
/**
* Returns `true` if the value is a built-in [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise).
*
* ```js
* util.types.isPromise(Promise.resolve(42)); // Returns true
* ```
* @since v10.0.0
*/
function isPromise(object: unknown): object is Promise<unknown>;
/**
* Returns `true` if the value is a [`Proxy`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) instance.
*
* ```js
* const target = {};
* const proxy = new Proxy(target, {});
* util.types.isProxy(target); // Returns false
* util.types.isProxy(proxy); // Returns true
* ```
* @since v10.0.0
*/
function isProxy(object: unknown): boolean;
/**
* Returns `true` if the value is a regular expression object.
*
* ```js
* util.types.isRegExp(/abc/); // Returns true
* util.types.isRegExp(new RegExp('abc')); // Returns true
* ```
* @since v10.0.0
*/
function isRegExp(object: unknown): object is RegExp;
/**
* Returns `true` if the value is a built-in [`Set`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) instance.
*
* ```js
* util.types.isSet(new Set()); // Returns true
* ```
* @since v10.0.0
*/
function isSet<T>(
object: T | {},
): object is T extends ReadonlySet<any> ? (unknown extends T ? never : ReadonlySet<any>) : Set<unknown>;
/**
* Returns `true` if the value is an iterator returned for a built-in [`Set`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) instance.
*
* ```js
* const set = new Set();
* util.types.isSetIterator(set.keys()); // Returns true
* util.types.isSetIterator(set.values()); // Returns true
* util.types.isSetIterator(set.entries()); // Returns true
* util.types.isSetIterator(set[Symbol.iterator]()); // Returns true
* ```
* @since v10.0.0
*/
function isSetIterator(object: unknown): boolean;
/**
* Returns `true` if the value is a built-in [`SharedArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) instance.
* This does _not_ include [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) instances. Usually, it is
* desirable to test for both; See `util.types.isAnyArrayBuffer()` for that.
*
* ```js
* util.types.isSharedArrayBuffer(new ArrayBuffer()); // Returns false
* util.types.isSharedArrayBuffer(new SharedArrayBuffer()); // Returns true
* ```
* @since v10.0.0
*/
function isSharedArrayBuffer(object: unknown): object is SharedArrayBuffer;
/**
* Returns `true` if the value is a string object, e.g. created
* by `new String()`.
*
* ```js
* util.types.isStringObject('foo'); // Returns false
* util.types.isStringObject(new String('foo')); // Returns true
* ```
* @since v10.0.0
*/
function isStringObject(object: unknown): object is String;
/**
* Returns `true` if the value is a symbol object, created
* by calling `Object()` on a `Symbol` primitive.
*
* ```js
* const symbol = Symbol('foo');
* util.types.isSymbolObject(symbol); // Returns false
* util.types.isSymbolObject(Object(symbol)); // Returns true
* ```
* @since v10.0.0
*/
function isSymbolObject(object: unknown): object is Symbol;
/**
* Returns `true` if the value is a built-in [`TypedArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray) instance.
*
* ```js
* util.types.isTypedArray(new ArrayBuffer()); // Returns false
* util.types.isTypedArray(new Uint8Array()); // Returns true
* util.types.isTypedArray(new Float64Array()); // Returns true
* ```
*
* See also [`ArrayBuffer.isView()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView).
* @since v10.0.0
*/
function isTypedArray(object: unknown): object is NodeJS.TypedArray;
/**
* Returns `true` if the value is a built-in [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) instance.
*
* ```js
* util.types.isUint8Array(new ArrayBuffer()); // Returns false
* util.types.isUint8Array(new Uint8Array()); // Returns true
* util.types.isUint8Array(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isUint8Array(object: unknown): object is Uint8Array;
/**
* Returns `true` if the value is a built-in [`Uint8ClampedArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray) instance.
*
* ```js
* util.types.isUint8ClampedArray(new ArrayBuffer()); // Returns false
* util.types.isUint8ClampedArray(new Uint8ClampedArray()); // Returns true
* util.types.isUint8ClampedArray(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isUint8ClampedArray(object: unknown): object is Uint8ClampedArray;
/**
* Returns `true` if the value is a built-in [`Uint16Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array) instance.
*
* ```js
* util.types.isUint16Array(new ArrayBuffer()); // Returns false
* util.types.isUint16Array(new Uint16Array()); // Returns true
* util.types.isUint16Array(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isUint16Array(object: unknown): object is Uint16Array;
/**
* Returns `true` if the value is a built-in [`Uint32Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array) instance.
*
* ```js
* util.types.isUint32Array(new ArrayBuffer()); // Returns false
* util.types.isUint32Array(new Uint32Array()); // Returns true
* util.types.isUint32Array(new Float64Array()); // Returns false
* ```
* @since v10.0.0
*/
function isUint32Array(object: unknown): object is Uint32Array;
/**
* Returns `true` if the value is a built-in [`WeakMap`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap) instance.
*
* ```js
* util.types.isWeakMap(new WeakMap()); // Returns true
* ```
* @since v10.0.0
*/
function isWeakMap(object: unknown): object is WeakMap<object, unknown>;
/**
* Returns `true` if the value is a built-in [`WeakSet`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet) instance.
*
* ```js
* util.types.isWeakSet(new WeakSet()); // Returns true
* ```
* @since v10.0.0
*/
function isWeakSet(object: unknown): object is WeakSet<object>;
/**
* Returns `true` if `value` is a `KeyObject`, `false` otherwise.
* @since v16.2.0
*/
function isKeyObject(object: unknown): object is KeyObject;
/**
* Returns `true` if `value` is a `CryptoKey`, `false` otherwise.
* @since v16.2.0
*/
function isCryptoKey(object: unknown): object is webcrypto.CryptoKey;
}
declare module "node:util" {
export * from "util";
}
declare module "node:util/types" {
export * from "util/types";
}
Mini Shell