ECMAScript Shims

Promise.prototype.finally

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

Array.prototype.flat

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

Array.prototype.flatMap

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

Array.prototype.group

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

String.prototype.matchAll

Spec-compliant polyfill for String.prototype.matchAll, in ES2020

AggregateError

ES Proposal spec-compliant shim for AggregateError

String.prototype.trim

ES5 spec-compliant shim for String.prototype.trim

iterator-helpers

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

Array.prototype.groupToMap

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

Promise.withResolvers

ES Proposal spec-compliant shim for Promise.withResolvers

Array.prototype.indexOf

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

String.prototype.trimEnd

ES2019 spec-compliant String.prototype.trimEnd shim

Array.prototype.filter

Simple ES6 Array.prototype.filter polyfill for older environments.

Array.prototype.map

Array.prototype.map spec-compliant polyfill

Number.isInteger

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

Array.prototype.reduceRight

An ES5 spec-compliant `Array.prototype.reduceRight` shim/polyfill/replacement that works as far down as ES3.

ArrayBuffer.prototype.detached

ES Proposal spec-compliant shim for ArrayBuffer.prototype.detached

function-bind

Map

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

Object.getPrototypeOf

An ES5 mostly-spec-compliant `Object.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible.

String.prototype.endsWith

A robust & optimized ES3-compatible polyfill for the `String.prototype.endsWith` method in ECMAScript 6.

SuppressedError

ES Proposal spec-compliant shim for SuppressedError

Array.prototype.concat

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

ArrayBuffer.prototype.transferToFixedLength

ES Proposal spec-compliant shim for ArrayBuffer.prototype.transferToFixedLength

Math.log1p

An ES-spec-compliant Math.log1p shim/polyfill/replacement that works as far down as ES3

Number.isSafeInteger

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

Number.prototype.toExponential

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

String.prototype.isWellFormed

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

Array.prototype.toReversed

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

ArrayBuffer.prototype.slice

ES spec-compliant shim for ArrayBuffer.prototype.slice