1. Es7 ShimECMAScript 7 compatibility shims for legacy JavaScript engines
3. GlobalthisECMAScript spec-compliant polyfill/shim for `globalThis`.
7. Array.prototype.atAn ES-spec-compliant (proposed) `Array.prototype.at`shim/polyfill/replacement that works as far down as ES3.
8. es6-shimECMAScript 6 compatibility shims for legacy JS engines
15. object-isES6-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.