declare module 'util' {
    import * as types from 'util/types';

    export interface InspectOptions extends NodeJS.InspectOptions { }
    export type Style = 'special' | 'number' | 'bigint' | 'boolean' | 'undefined' | 'null' | 'string' | 'symbol' | 'date' | 'regexp' | 'module';
    export type CustomInspectFunction = (depth: number, options: InspectOptionsStylized) => string;
    export interface InspectOptionsStylized extends InspectOptions {
        stylize(text: string, styleType: Style): string;
    }
    export function format(format?: any, ...param: any[]): string;
    export function formatWithOptions(inspectOptions: InspectOptions, format?: any, ...param: any[]): string;
    /** @deprecated since v0.11.3 - use a third party module instead. */
    export function log(string: string): void;
    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;
        const custom: unique symbol;
    }
    /** @deprecated since v4.0.0 - use `Array.isArray()` instead. */
    export function isArray(object: any): object is any[];
    /** @deprecated since v4.0.0 - use `util.types.isRegExp()` instead. */
    export function isRegExp(object: any): object is RegExp;
    /** @deprecated since v4.0.0 - use `util.types.isDate()` instead. */
    export function isDate(object: any): object is Date;
    /** @deprecated since v4.0.0 - use `util.types.isNativeError()` instead. */
    export function isError(object: any): object is Error;
    export function inherits(constructor: any, superConstructor: any): void;
    export function debuglog(key: string): (msg: string, ...param: any[]) => void;
    /** @deprecated since v4.0.0 - use `typeof value === 'boolean'` instead. */
    export function isBoolean(object: any): object is boolean;
    /** @deprecated since v4.0.0 - use `Buffer.isBuffer()` instead. */
    export function isBuffer(object: any): object is Buffer;
    /** @deprecated since v4.0.0 - use `typeof value === 'function'` instead. */
    export function isFunction(object: any): boolean;
    /** @deprecated since v4.0.0 - use `value === null` instead. */
    export function isNull(object: any): object is null;
    /** @deprecated since v4.0.0 - use `value === null || value === undefined` instead. */
    export function isNullOrUndefined(object: any): object is null | undefined;
    /** @deprecated since v4.0.0 - use `typeof value === 'number'` instead. */
    export function isNumber(object: any): object is number;
    /** @deprecated since v4.0.0 - use `value !== null && typeof value === 'object'` instead. */
    export function isObject(object: any): boolean;
    /** @deprecated since v4.0.0 - use `(typeof value !== 'object' && typeof value !== 'function') || value === null` instead. */
    export function isPrimitive(object: any): boolean;
    /** @deprecated since v4.0.0 - use `typeof value === 'string'` instead. */
    export function isString(object: any): object is string;
    /** @deprecated since v4.0.0 - use `typeof value === 'symbol'` instead. */
    export function isSymbol(object: any): object is symbol;
    /** @deprecated since v4.0.0 - use `value === undefined` instead. */
    export function isUndefined(object: any): object is undefined;
    export function deprecate<T extends Function>(fn: T, message: string, code?: string): T;
    export function isDeepStrictEqual(val1: any, val2: any): boolean;

    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>;

    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 {
        const custom: unique symbol;
    }
    export class TextDecoder {
        readonly encoding: string;
        readonly fatal: boolean;
        readonly ignoreBOM: boolean;
        constructor(
          encoding?: string,
          options?: { fatal?: boolean; ignoreBOM?: boolean }
        );
        decode(
          input?: NodeJS.ArrayBufferView | ArrayBuffer | null,
          options?: { stream?: boolean }
        ): string;
    }

    export interface EncodeIntoResult {
        /**
         * The read Unicode code units of input.
         */

        read: number;
        /**
         * The written UTF-8 bytes of output.
         */
        written: number;
    }

    export { types };

    export class TextEncoder {
        readonly encoding: string;
        encode(input?: string): Uint8Array;
        encodeInto(input: string, output: Uint8Array): EncodeIntoResult;
    }
}