Synchronous validation of a path existing either as a file or as a directory.

Parses, serializes, and manipulates MIME types, according to the WHATWG MIME Sniffing Standard

Run QUnit unit tests in a headless Chrome instance

correct invalid SPDX expressions

A robust, ES3 compatible, "has own property" predicate.

assert with status codes

Drop in replacement for qunit `test` which retries a failed test.

Extra assertions on top of node's assert module

Sinon assertions for QUnit with custom messages support.

Is this value a JS ArrayBuffer?

A set of assertions for checking thats an element has ( or does not have ) any number of classes. The check is order independent and gives a diff of the expected classes.

What is the type of this builtin JS value?

Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Is this value a JS SharedArrayBuffer?

Which kind of boxed JS primitive is this?

`Object.getOwnPropertyDescriptor`, but accounts for IE's broken implementation.

Is this specifier a node.js core module?

Robustly get the length of a Typed Array

`Object.defineProperty`, but not IE 8's broken one.

A helper to optimistically set Symbol.toStringTag, when possible.