is-map

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

is-set

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

is-weakmap

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

is-weakset

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