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

Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?

Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.

ES5 spec-compliant shim for String.prototype.trim

Is this value a JS SharedArrayBuffer?

The URI implementation that is used by VS Code and its extensions

Is this value a JS ArrayBuffer?

ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.

Is this value `document.all`, i.e. an object with the [[IsHTMLDDA]] internal slot?

Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Set a function's length property

Store information about any JS value in a side channel, using a linked list

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

ES6 spec-compliant RegExp.prototype.flags shim.

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

Returns true if a value has the characteristics of a valid JavaScript data descriptor.

Store information about any JS value in a side channel, using a Map

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

Is this value a JS DataView? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

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