@arpinum/defender

Every absurdity has a champion to defend it.
Oliver Goldsmith

@arpinum/defender is a collection of assertions to do some runtime type checking.

Installation

npm install @arpinum/defender --save

Assertion throwing exception when not satisfied:

import { assert } from "@arpinum/defender";

assert("hello").toBeANumber(); // throws: value must be a number

Simple validation returning a boolean:

import { is } from "@arpinum/defender";

is("hello").aNumber(); // false

More examples in examples.