type-checker

A simple, comprehensive and lightweight type-checking library for JavaScript.

Most type-checking libraries are compatible with 10 or 20 types. This library offers 50+, but the minified library is still just 3KB in size.

It's easy to check for anything from a Number, String or Array to a Promise, WeakMap or Generator – and much more!

Install

Using npm:

npm i type-checker

Using yarn:

yarn add type-checker

Import

const { isAsyncFunction, isFunction, isPromise } = require('type-checker');

Documentation

To view our docs, click here.

Quick Example 1

const { isAsyncFunction, isFunction } = require('type-checker');

function run(fn) {
  if (isFunction(fn) || isAsyncFunction(fn)) {
    fn();
  } else {
    return new TypeError('run expects a function or an async function.');
  }
}