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przemyslawjanpietrzak/tsc-on-js.js

Last active December 11, 2018 13:51
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tsc-on-js.js
// @ts-check
export const fn = (arg1, arg2, arg3) => 42;
fn(1, 2, 3, 4); // ERROR Expected 3 arguments, but got 4
document.querySelector(42); // ERROR Argument of type '42' is not assignable to parameter of type 'string'.
/**
*
* @param {string} arg
* @returns {number}
*/
function fn1(arg) {
return arg / 2; // ERROR
}
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