has-tostringtag

Is this value a JS regex? Works cross-realm/iframe, and despite ES6 @@toStringTag

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

string representations of objects in node and the browser

Is this an arguments object? It's a harder question than you think.

Is this value an ES BigInt?

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

Which kind of boxed JS primitive is this?

A query library for ECMAScript AST using a CSS selector like query language.

Get and robustly cache all JS language-level intrinsics at first require time

A simple cache for a few of the JS Error constructors.

An Esprima-compatible JavaScript parser built on Acorn

Robustly `.call.bind()` a function

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

A JavaScript parser

Robust call-bound JavaScript intrinsics, using `call-bind` and `get-intrinsic`.

An AST-based pattern checker for JavaScript.

Is this value a JS SharedArrayBuffer?

An AST-based pattern checker for JavaScript.

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

Robust call-bound JavaScript intrinsics, using `call-bind` and `get-intrinsic`.

The semantic version parser used by npm.

the most correct and second fastest glob implementation in JavaScript

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

A simple cache for a few of the JS Error constructors.

string representations of objects in node and the browser

Modern Buffer API polyfill without footguns

Get and robustly cache all JS language-level intrinsics at first require time