An essential Set poorlyfill for legacy browsers.
Only methods are add, delete, and has.
- CDN via https://unpkg.com/@ungap/essential-set
- ESM via
import Set from '@ungap/essential-set' - CJS via
const Set = require('@ungap/essential-set')
Compatible down to IE9, works well with ES5 shim upfront in IE8 (and maybe lower too).