chkjs v1.1.0

check.js

A simple type checker for JavaScript

Usage

Check if value is a string.

let value = 'This is a string.';
check(value, String);

Check if value is a list of strings.

let value = ['a', 'b', 'c'];
check(value, [String]);

Check if value is a string, or null.

let value = 'string';
check(value, String, null);

Check if value is an object with key id with type string.

let value = {
  id: '0af390f0-abb6-4ef6-b9af-6287e6aab172'
};
check(value, {id: String});

Please have a look at the tests to see more examples.

Credit

Forked from: Martijn de Haan https://github.com/martijndeh/check