An ESnext spec-compliant Set shim/polyfill/replacement that works as far down as ES3.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

npm install --save @kollorg/non-iure-eveniet

var set = new Set();
var obj = {};

set.add(obj);

set.has(obj); // true
map.has(3); // false

Simply clone the repo, npm install, and run npm test