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

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

Determine if the current node version supports the `--preserve-symlinks` flag.

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

Implementation of Function.prototype.bind

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

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

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

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

Determine if a function is a native generator function.

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

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

Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.

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

ES2019 spec-compliant String.prototype.trimStart shim.

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

Robustly `.call.bind()` a function

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

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

Determine if the JS environment has BigInt support.