weak-map3.3mApache-2.01.0.8A WeakMap shim for Node.js and browsers
drsesIl y a about 3 yearsweakmap, weak-map, weak, map es6-weak-map24.8mISC2.0.3ECMAScript6 WeakMap polyfill
medikooIl y a about 3 yearsweakmap, map, collection, es6 side-channel-weakmap147.5mMIT1.0.2Store information about any JS value in a side channel. Uses WeakMap if available.
ljharbIl y a 7 monthsweakmap, map, side, channel is-weakmap119.6mMIT2.0.2Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
inspect-jsIl y a over 1 yearweakmap, map, set, weakset core-js187.9mMIT3.44.0Standard library
zloirockIl y a 3 daysWeakMap, ES3, ES5, ES6