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

Is this value negative zero? === will lie to you

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

Determine if a value is an ES6 Symbol or not.

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

A robust, ES3 compatible, "has own property" predicate.

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

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

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.

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

Does the current environment have `import()` support?

Get the byteLength out of a DataView, robustly.

Is this value a JS ArrayBuffer?

Robustly get the length of a Typed Array

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

Is this value a JS SharedArrayBuffer?

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

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

Which kind of boxed JS primitive is this?

Get the ArrayBuffer out of a TypedArray, robustly.