doge-assert

import assert from 'doge-assert';

This is useful if you want to quickly typecheck something at runtime.

import assert from 'doge-assert';

let a = 'abc';
let b = '123';

assert({
  number: [
    a,
    b,
  ],
 }); // false

assert({
  string: [
    a,
    b,
  ],
 }); // true