index.d.ts

declare namespace is {
  export type typeOf = (value: any) => boolean;

  // Primitives
  export function string(value: any): boolean;
  export function number(value: any): boolean;
  export function undefined(value: any): boolean;
  export function boolean(value: any): boolean;
  export function bool(value: any): boolean;
  export function nullValue(value: any): boolean;
  export function symbol(value: any): boolean;
  export function bigint(value: any): boolean;
  export function nullOrUndefined(value: any): boolean;
  export function primitive(value: any): boolean;

  // Functions
  export function func(value: any): boolean;
  export function generatorFunction(value: any): boolean;
  export function asyncFunction(value: any): boolean;
  export function boundFunction(value: any): boolean;

  // Iterable & Generator
  export function iterable(value: any): boolean;
  export function asyncIterable(value: any): boolean;
  export function generator(value: any): boolean;

  // Objects
  export function promise(value: any): boolean;
  export function classObject(value: any): boolean;
  export function array(value: any): boolean;
  export function object(value: any): boolean;
  export function plainObject(value: any): boolean;
  export function set(value: any): boolean;
  export function map(value: any): boolean;
  export function set(value: any): boolean;
  export function weakMap(value: any): boolean;
  export function weakSet(value: any): boolean;
  export function error(value: any): boolean;
  export function date(value: any): boolean;
  export function regExp(value: any): boolean;

  // TypedArray & Buffers
  export function typedArray(value: any): boolean;
  export function buffer(value: any): boolean;
  export function int8Array(value: any): boolean;
  export function uint8Array(value: any): boolean;
  export function uint8ClampedArray(value: any): boolean;
  export function int16Array(value: any): boolean;
  export function uint16Array(value: any): boolean;
  export function int32Array(value: any): boolean;
  export function uint32Array(value: any): boolean;
  export function float32Array(value: any): boolean;
  export function float64Array(value: any): boolean;
  export function arrayBuffer(value: any): boolean;
  export function sharedArrayBuffer(value: any): boolean;
  export function dataView(value: any): boolean;

  // Misc
  export function falsy(value: any): boolean;
  export function truthy(value: any): boolean;
  export function nan(value: any): boolean;
  export function integer(value: any): boolean;
  export function directInstanceOf(instance: any, focus: any): boolean;
  export function emptyString(value: string): boolean;

  export namespace utils {
    export function getObjectType(value: any): string;
  }
}

export as namespace is;
export = is;