Like a Set, but provides the index of the `key` in the backing array

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

ES5 spec-compliant shim for String.prototype.trim

TypeScript definitions for http-assert

A tiny warning function

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

parse SPDX license expressions

A querystring parser that supports nesting and arrays, with a depth limit

If available, the `Object.prototype.__proto__` accessor and mutator, call-bound

ES6 spec-compliant RegExp.prototype.flags shim.

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

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

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

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

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

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

Unbox a boxed JS primitive value.

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

test whether SPDX expressions satisfy licensing criteria

`Iterator.prototype`, or a shared object to use.