is-set

Get an iterator for any JS language value. Works robustly across all environments, all versions.

Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.

Get the first fulfilled promise that satisfies the provided testing function

Trace the original position through a source map

Generate source maps

Store information about any JS value in a side channel. Uses WeakMap if available.

Remap sequential sourcemaps through transformations to point at the original source code

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

Parses set-cookie headers into objects

Get an iterator for any JS language value. Works robustly across all environments, all versions.

{G,S}et object values using MongoDB-like path notation

Store information about any JS value in a side channel. Uses WeakMap if available.

An AST-based pattern checker for JavaScript.

string representations of objects in node and the browser

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

Robustly `.call.bind()` a function

Array#isArray for older browsers

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

Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Firefox 17-26 iterators throw a StopIteration object to indicate "done". This normalizes it.