array.prototype.tosorted
An ESnext spec-compliant `Array.prototype.toSorted` shim/polyfill/replacement that works as far down as ES3.
es-iterator-helpers
An ESnext spec-compliant iterator helpers shim/polyfill/replacement that works as far down as ES3.
object.assign
ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim