ECMAScript Shims

ECMAScript 5 compatibility shims for legacy (and modern) JavaScript engines

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

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

ECMAScript 6 compatibility shims for legacy JS engines

An ES-spec-compliant Math.clz32 shim/polyfill/replacement that works as far down as ES3

An ES-spec-compliant Math.asinh shim/polyfill/replacement that works as far down as ES3

ES2017 spec-compliant shim for Object.entries

An ESnext spec-compliant `DisposableStack`, `AsyncDisposableStack`, `Symbol.dispose`, and `Symbol.asyncDispose` shim/polyfill/replacement that works as far down as ES3.

.github repo for es-shims org

Official ES spec-compliant polyfill for Object.fromEntries

ES Proposal spec-compliant shim for Map.prototype.getOrInsertComputed

ES Proposal spec-compliant shim for Promise.prototype.finally

ES spec-compliant `Date` shim/polyfill/replacement that works as far down as ES3

ES Object-related atoms: Object, ToObject, RequireObjectCoercible

ES Proposal spec-compliant shim for Promise.withResolvers

An ES spec-compliant `Array.prototype.push` shim/polyfill/replacement that works as far down as ES3.

An ES-spec-compliant shim/polyfill/replacement for ArrayBuffer base64 methods that works as far down as ES3

An ES2015 spec-compliant `Map` shim/polyfill/replacement that works as far down as ES3.

Spec-compliant shim for Symbol.prototype.description proposal.

An ES-spec-compliant String.raw shim/polyfill/replacement that works as far down as ES3

ES2019 spec-compliant String.prototype.trimStart shim

ES2019 spec-compliant shim for String.prototype.trimLeft.

ES2019 spec-compliant String.prototype.trimEnd shim

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

An ES-spec-compliant Reflect.apply shim/polyfill/replacement that works as far down as ES3

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

An ES-spec-compliant `parseInt` shim/polyfill/replacement that works as far down as ES3

Spec-compliant shim for `Object.getOwnPropertyDescriptors` that works in ES5.

ES spec-compliant `Object.defineProperties` shim/polyfill/replacement that works as far down as ES3

An ES-spec-compliant Number.parseFloat shim/polyfill/replacement that works as far down as ES3