Determine if the JS environment has Symbol support. Supports spec, or shams.

Determine if the JS environment has `Symbol.toStringTag` support. Supports spec, or shams.

Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.

Returns an array of Typed Array names that are available in the current environment

Implementation of Function.prototype.bind

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

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

Get the dependency tree of a module

Parse, validate, manipulate, and display dates

An ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.

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

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

Determine if a function is a native generator function.

ES6 spec-compliant RegExp.prototype.flags shim.

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

Does this JS environment support the `name` property on functions?

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

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

Unbox a boxed JS primitive value.

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