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