weak-map3.8mApache-2.01.0.8A WeakMap shim for Node.js and browsers
drsesover 3 yearsweakmap, weak-map, weak, map weakmap33.5kMIT0.0.6Shim for WeakMap with non-leaky O(1) lookup time
Benvieover 3 yearsweakmap, harmony, collection, ecmascript side-channel-weakmap194.3mMIT1.0.2Store information about any JS value in a side channel. Uses WeakMap if available.
ljharb10 monthsweakmap, map, side, channel is-weakmap144.2mMIT2.0.2Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
inspect-jsover 1 yearweakmap, map, set, weakset