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

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

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

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

Iterate any iterable JS value. Works robustly in all environments, all versions.

Does a JS type have a getter/setter property

Set for RDF/JS Terms

javascript standard data structure library which benchmark against C++ STL

javascript standard data structure library which benchmark against C++ STL

Declarative JS tests with lazy evaluation using jest.

Transit is a data format and a set of libraries for conveying values between applications written in different languages. This library provides support for marshalling Transit data to/from Javascript.

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

Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.

Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.

Some utilities to js

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

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

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

Basic cache object for storing key-value pairs.

set a new property in a js object and return the value of the given property