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

Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

Determine if the JS environment has BigInt support.

A node.js module for parsing form data, especially file uploads.

ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim

javascript standard data structure library which benchmark against C++ STL

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

ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.

ECMAScript spec-compliant polyfill/shim for `globalThis`

Unbox a boxed JS primitive value.

Helper package to shim a method into `Array.prototype[Symbol.unscopables]`

An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.

string representations of objects in node and the browser

An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.

Concurrency primitives for TypeScript and JavaScript.

Document integrity validator for AI agents. Verifies authenticity against international standards before acting on contents. PASS/FAIL verdict in one call.

Is this value an ES BigInt?

Gets the description of a Symbol. Handles `Symbol()` vs `Symbol('')` properly when possible.

A library to create readable "multipart/form-data" streams. Can be used to submit forms and file uploads to other web applications.

ES2017 spec-compliant Object.values shim.