@js-utilities/typecheck

Type checking library

A set of super-simple type checkers. Each checker returns boolean value. Most checkers are typescript type predicates.

Installation

npm i -S @js-utilities/typecheck

Usage example

import { isCallable } from "@js-utilities/typecheck";

const a: unknown = global.value;

if (isCallable(a)) a();

Available checkers:

Checker	Return type
isCallable	boolean
isFunction	value is Function
isArrowFunction	boolean
isArray<T>	value is T[]
isObject<T>	value is T
isBoolean	value is boolean
isUndefined	value is undefined
isNumber	value is number
isString	value is string
isSymbol	value is symbol
isNull	value is null
isMap<T, U>	value is Map<T, U>
isSet<T>	value is Set<T>
isWeakSet<T>	value is WeakSet<T>
isWeakMap<T, U>	value is WeakMap<T, U>
isPromise<T>	value is Promise<T>

License

MIT License