An assertion method to check if a sync or async function throws and assert on error properties.

The Assertion Library For Zoroaster Context Testing Framework Including Deep Equal & Assert Throws.

Node's builtin `assert.throws` does not work very well with rejecting promises or (equivalently) async functions.

parse SPDX license expressions

Parse the things that can be arguments to `npm install`

Soft Asserts JSON, Array and other data

minimalistic-assert ===

The assert module from Node.js, for the browser.

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

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

Invariant and non-null/undefined assertion check with type guards

correct invalid SPDX expressions

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

assert with status codes

Is this value a JS ArrayBuffer?

Is this value a JS SharedArrayBuffer?

Which kind of boxed JS primitive is this?

Extra assertions on top of node's assert module

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.

Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.