Found 3165 results for polyfill

string.prototype.trimend

ES2019 spec-compliant String.prototype.trimEnd shim.

has-symbols

Determine if the JS environment has Symbol support. Supports spec, or shams.

core-util-is

The `util.is*` functions introduced in Node v0.12.

array-buffer-byte-length

Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.

fs.realpath

Use node's fs.realpath, but fall back to the JS implementation if the native one fails

setprototypeof

A small polyfill for Object.setprototypeof

regexp.prototype.flags

ES6 spec-compliant RegExp.prototype.flags shim.

array.prototype.flat

An ES2019 spec-compliant `Array.prototype.flat` 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

string.prototype.trim

ES5 spec-compliant shim for String.prototype.trim

arraybuffer.prototype.slice

ES spec-compliant shim for ArrayBuffer.prototype.slice

string.prototype.trimstart

ES2019 spec-compliant String.prototype.trimStart shim.

array.prototype.findlastindex

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

function.prototype.name

An ES2015 spec-compliant `Function.prototype.name` shim

globalthis

ECMAScript spec-compliant polyfill/shim for `globalThis`

object.values

ES2017 spec-compliant Object.values shim.

array-includes

An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.

object-is

ES2015-compliant shim for Object.is - differentiates between -0 and +0

object.fromentries

ES proposal-spec-compliant Object.fromEntries shim.

array.prototype.flatmap

An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.

string.prototype.repeat

A robust & optimized `String.prototype.repeat` polyfill, based on the ECMAScript 6 specification.

web-streams-polyfill

Web Streams, based on the WHATWG spec reference implementation

reflect.getprototypeof

An ES2015 mostly-spec-compliant `Reflect.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible

object.entries

ES2017 spec-compliant Object.entries shim.

array.prototype.tosorted

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

css.escape

A robust polyfill for the `CSS.escape` utility method as defined in CSSOM.

array.prototype.findlast

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

object.groupby

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

string.prototype.includes

A robust & optimized `String.prototype.includes` polyfill, based on the ECMAScript 6 specification.

es-iterator-helpers

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

@tybys/wasm-util

WASI polyfill for browser and some wasm util

raf

requestAnimationFrame polyfill for node and the browser

es6-promise

A lightweight library that provides tools for organizing asynchronous code

Assign the enumerable es6 Symbol properties from one or more objects to the first object passed on the arguments. Can be used as a supplement to other extend, assign or merge methods as a polyfill for the Symbols part of the es6 Object.assign method.

node-abort-controller

AbortController for Node based on EventEmitter

es6-symbol

ECMAScript 6 Symbol polyfill

es5-ext

ECMAScript extensions and shims

object.getownpropertydescriptors

ES2017 spec-compliant shim for `Object.getOwnPropertyDescriptors` that works in ES5.

formdata-polyfill

HTML5 `FormData` for Browsers and Node.

array.prototype.reduce

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

homedir-polyfill

Node.js os.homedir polyfill for older versions of node.js.

is-nan

ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.

postcss-focus-within

Use the :focus-within pseudo-selector in CSS

css-blank-pseudo

Style form elements when they are empty

map-or-similar

A JavaScript (JS) Map or Similar object polyfill if Map is not available.

resize-observer-polyfill

A polyfill for the Resize Observer API

util.promisify

Polyfill/shim for util.promisify in node versions < v8

ext

JavaScript utilities with respect to emerging standard

object.hasown

ES spec-compliant shim for Object.hasOwn

is-absolute

Returns true if a file path is absolute. Does not rely on the path module and can be used as a polyfill for node.js native `path.isAbolute`.

css-has-pseudo

Style elements relative to other elements in CSS

path-dirname

Node.js path.dirname() ponyfill

@csstools/postcss-is-pseudo-class

A pseudo-class for matching elements in a selector list

fromentries

Object.fromEntries() ponyfill (in 6 lines)

array-find-index

ES2015 `Array#findIndex()` ponyfill

@sec-ant/readable-stream

A tiny, zero-dependency yet spec-compliant asynchronous iterator polyfill/ponyfill for ReadableStreams.

postcss-dir-pseudo-class

Use the :dir pseudo-class in CSS

crypto-randomuuid

Polyfill crypto.randomUUID

unfetch

Bare minimum fetch polyfill in 500 bytes

@juggle/resize-observer

Polyfills the ResizeObserver API and supports box size options from the latest spec

string.prototype.padend

ES2017 spec-compliant String.prototype.padEnd shim.

listenercount

backwards compatible version of builtin events.listenercount

buffer-indexof-polyfill

This is a polyfill for Buffer#indexOf introduced in NodeJS 4.0.

marky

Performance timer based on performance.mark() and measure()

is-function

is that thing a function? Use this module to find out

@react-native/js-polyfills

Polyfills for React Native.

scroll-into-view-if-needed

Ponyfill for upcoming Element.scrollIntoView() APIs like scrollMode: if-needed, behavior: smooth and block: center

array.prototype.map

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

iterall

Minimal zero-dependency utilities for using JavaScript Iterables in all environments.

capture-stack-trace

Error.captureStackTrace ponyfill

webcrypto-core

Common layer to be used by crypto libraries based on WebCrypto API for input validation.

typedarray.prototype.slice

ES spec-compliant shim for TypedArray.prototype.slice

array.prototype.find

Array.prototype.find ES6 polyfill.

set-immediate-shim

Simple setImmediate shim

array.prototype.toreversed

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

es6-map

ECMAScript6 Map polyfill

@zxing/text-encoding

Polyfill for the Encoding Living Standard's API.

launchdarkly-eventsource

Fork of eventsource package - W3C compliant EventSource client for Node.js and browser (polyfill)

async-listener

Polyfill exporting trevnorris's 0.11+ asyncListener API.

array-from

A ponyfill for the ES 2015 (ES6) `Array.from()`.

es6-object-assign

ECMAScript 2015 (ES6) Object.assign polyfill and ponyfill

any-observable

Support any Observable library and polyfill

broadcast-channel

A BroadcastChannel that works in New Browsers, Old Browsers, WebWorkers, NodeJs, Deno and iframes

es-aggregate-error

ES Proposal spec-compliant shim for AggregateError

promise.allsettled

ES Proposal spec-compliant shim for Promise.allSettled

array.prototype.filter

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

path2d

Path2D API for node. Can be used for server-side rendering with canvas

node-polyfill-webpack-plugin

Polyfill Node.js core modules in Webpack.

string.fromcodepoint

A robust & optimized `String.fromCodePoint` polyfill, based on the ECMAScript 6 specification.

@formatjs/intl-displaynames

Polyfill for: https://tc39.es/proposal-intl-displaynames

@ungap/promise-all-settled

A cross platform Promise.allSettled polyfill

create-react-context

Polyfill for the proposed React context API

promise.prototype.finally

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

es5-shim

ECMAScript 5 compatibility shims for legacy JavaScript engines

react-native-get-random-values

A small implementation of `crypto.getRandomValues` for React Native. This is useful to polyfill for libraries like [uuid](https://www.npmjs.com/package/uuid) that depend on it.

react-native-url-polyfill

A lightweight and trustworthy URL polyfill for React Native

string.prototype.trimright

ES2019 spec-compliant String.prototype.trimLeft shim.

symbol.prototype.description

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

string.prototype.padstart

ES2017 spec-compliant String.prototype.padStart shim.

@hypnosphi/create-react-context

Polyfill for the proposed React context API

string.prototype.trimleft

ES2019 spec-compliant String.prototype.trimLeft shim.

reflect.ownkeys

ES2015 spec-compliant shim for Reflect.ownKeys

path2d-polyfill

Polyfills Path2D api for canvas rendering

fake-indexeddb

Fake IndexedDB: a pure JS in-memory implementation of the IndexedDB API

array-find

ES6 Array.find ponyfill. Return the first array element which satisfies a testing function.

@edge-runtime/ponyfill

A ponyfill (doesn't overwrite the native methods) to use Edge Runtime APIs in any environment.

string.prototype.codepointat

A robust & optimized `String.prototype.codePointAt` polyfill, based on the ECMAScript 6 specification.

find-index

finds an item in an array matching a predicate function, and returns its index

@borewit/text-codec

Text Decoder

intl

Polyfill the ECMA-402 Intl API (except collation)

fastestsmallesttextencoderdecoder

The fastest smallest Javascript polyfill for the encode of TextEncoder and decode of TextDecoder for UTF-8 only. Made by AnonyCo with ❤️ from 🐕s.

event-source-polyfill

A polyfill for http://www.w3.org/TR/eventsource/

well-known-symbols

An ESnext spec-compliant shim/polyfill/replacement for all Well-Known Symbols that works in any environment with Symbols.

smoothscroll-polyfill

Smooth Scroll behavior polyfill

is-integer

ES2015 (ES6) Number.isInteger polyfill

document.contains

Polyfill/shim for `document.contains`

null-check

Ensure a path doesn't contain null bytes

url-search-params-polyfill

a simple polyfill for javascript URLSearchParams

@nevware21/ts-utils

Comprehensive TypeScript/JavaScript utility library with cross-environment support (Node.js, browser, web worker) providing helper functions, polyfills (ES5-ES2023), type checking utilities, and optimized implementations for better minification and code r

@sanity/eventsource

EventSource polyfill for browser and node.js

custom-event-polyfill

A polyfill for creating CustomEvents on IE9+ if the native implementation is missing.

@stdlib/utils-get-prototype-of

Return the prototype of a provided object.

@formatjs/intl-numberformat

Ponyfill for ES2020 Intl.NumberFormat

messageformat

Intl.MessageFormat / Unicode MessageFormat 2 parser, runtime and polyfill

weakmap-polyfill

ECMAScript6 WeakMap polyfill

classlist-polyfill

Cross-browser JavaScript shim that fully implements element.classList (referenced on MDN)

@formatjs/intl-pluralrules

Polyfill for Intl.PluralRules

monitor-event-loop-delay

Polyfill for perf_hooks.monitorEventLoopDelay(...)

@stdlib/fs-exists

Test whether a path exists on the filesystem.

esbuild-plugins-node-modules-polyfill

Polyfills nodejs builtin modules and globals for the browser.

blob-polyfill

Blob.js implements the W3C Blob interface in browsers that do not natively support it.

@formatjs/intl-datetimeformat

Intl.DateTimeFormat polyfill

eventsource-polyfill

A browser polyfill for W3C EventSource (http://www.w3.org/TR/eventsource/)

mouse-change

Mouse state change listener

mouse-event

Cross browser mouse event property access

web-animations-js

JavaScript implementation of the Web Animations API

@webcomponents/custom-elements

HTML Custom Elements Polyfill

@webcomponents/shadycss

Polyfill for Scoped CSS

@ungap/url-search-params

The URLSearchParams polyfill.

objectFitPolyfill

A Javascript polyfill for browsers that don't support the object-fit CSS property

resize-observer

An implementation and polyfill of the Resize Observer draft.

element-closest

Return the closest element matching a selector up the DOM tree

@webcomponents/webcomponentsjs

Web Components Polyfills

array.prototype.every

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

@ungap/with-resolvers

Promise.witResolvers() polyfill

clipboard-polyfill

A polyfill for the asynchronous clipboard API

@luma.gl/gltools

WebGL2 API Polyfills for WebGL1 WebGLRenderingContext

eme-encryption-scheme-polyfill

A polyfill for the encryptionScheme field in EME

promise.any

ES 2021 spec-compliant shim for Promise.any

regexp.escape

A robust ES3-compatible polyfill for the `RegExp.escape` proposal - see https://github.com/tc39/proposal-regex-escaping

construct-style-sheets-polyfill

Constructible style sheets/adopted style sheets polyfill

css-vars-ponyfill

Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers

@toruslabs/broadcast-channel

A BroadcastChannel that works in New Browsers, Old Browsers, WebWorkers

smooth-scroll-into-view-if-needed

Ponyfill for smooth scrolling elements into view (if needed!)

wicg-inert

A polyfill for the proposed inert API

barcode-detector

A Barcode Detection API polyfill that uses ZXing webassembly under the hood

object-fit-images

Polyfill object-fit and object-position on images on IE9, IE10, IE11, Edge, Safari, ...

proxy-polyfill

Polyfill for the Proxy object

@deno/shim-deno

Deno namespace shim for Node.js

navigator.sendbeacon

Polyfill for navigator.sendBeacon()

visibilityjs

Wrapper for the Page Visibility API

array.prototype.foreach

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

ember-cached-decorator-polyfill

Polyfill for RFC 566: @cached

ember-destroyable-polyfill

Polyfill for RFC 580: Destroyables

@ant-design/create-react-context

A fork of create-react-context in MIT license

array.prototype.at

An ES-spec-compliant (proposed) Array.prototype.at shim/polyfill/replacement that works as far down as ES3

keyboardevent-key-polyfill

polyfill for `KeyboardEvent.prototype.key`

ember-cli-typescript-blueprint-polyfill

A polyfill for Ember CLI's TypeScript blueprint capabilities.

object.getprototypeof

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

@bloomberg/record-tuple-polyfill

A polyfill for the Record and Tuple Stage 2 ECMAScript proposal.

error-polyfill

Javascript Error Polyfill

audio-recorder-polyfill

MediaRecorder polyfill to record audio in Edge and Safari

animation-frame-polyfill

Polyfill requestAnimationFrame and cancelAnimationFrame

frontend-collective-react-dnd-scrollzone

A cross browser solution to scrolling during drag and drop.

ts-replace-all

This package includes the [core-js](https://github.com/zloirock/core-js) polyfill for `String#replaceAll`, along with TypeScript typings.

string.prototype.startswith

A robust & optimized `String.prototype.startsWith` polyfill, based on the ECMAScript 6 specification.

function.name-polyfill

Polyfill for the basic functionality of `Function.name` accessor property in its pre-ES6 form

@oddbird/popover-polyfill

Popover Attribute Polyfill

seamless-scroll-polyfill

Smooth Scroll behavior polyfill

sugar

A Javascript utility library for working with native objects.

element-internals-polyfill

A polyfill for the element internals specification

postcss-flexibility

PostCSS plugin for Flexibility polyfill

focus-options-polyfill

JavaScript polyfill for the WHATWG spec of focusOptions, that enables a set of options to be passed to the focus method.

transit-js

Transit is a data format and a set of libraries for conveying values between applications written in different languages. This library provides support for marshalling Transit data to/from Javascript.

mq-polyfill

CSSOM-valid and jsdom/Jest-compatible matchMedia polyfill for server-side unit tests

es6-promise-polyfill

Polyfill for ES6 Promise

core-js-bundle

Standard library

element-closest-polyfill

A minimal polyfill for Element.closest

flexibility

A JavaScript polyfill for Flexbox

element-matches

Super small `Element.matches` fix for older browsers (IE 9+, Edge 12+, Safari, Android browsers)

ember-assign-polyfill

A polyfill for Ember.assign in <= 2.4

canvas-roundrect-polyfill

CanvasRenderingContext2D.roundRect() and Path2D.roundRect() polyfill

es7-shim

ECMAScript 7 compatibility shims for legacy JavaScript engines

mdn-polyfills

MDN polyfills

scroll-behavior-polyfill

A polyfill for the 'scroll-behavior' CSS-property

utils-indexof

Returns the first index at which a given element can be found.

@cto.af/textdecoder

Quick wrapper that finds TextDecoder or polyfills a bad implementation

stickyfilljs

Polyfill for CSS `position: sticky`

form-request-submit-polyfill

<form>.requestSubmit() polyfill

mobile-drag-drop

Polyfill for making HTML5 drag and drop possible in all browsers.

random-poly-fill

A polyfill for crypto.randomFill and crypto.randomFillSync from Node.js core

babel-plugin-array-includes

Replaces `arr.includes(val)' with `arr.indexOf(val) >= 0`.

node-inspect-extracted

Node's util.inspect, extracted for use on the Web

svgxuse

A polyfill that fetches external SVGs referenced in use elements when the browser itself fails to do so.

@stdlib/math-base-special-trunc

Round a double-precision floating-point number toward zero.

@expo/browser-polyfill

Browser polyfill for making React Native compatible with web libs like pixi.js, three.js, phaser.js

fullscreen-api-polyfill

W3C's Fullscreen API Polyfill

@stdlib/utils-index-of

Return the first index at which a given element can be found.

object-assign-polyfill

Simple ES6 Object.assign() polyfill for older environments.

@perf-tools/performance

User Timing polyfill

iterator-helper

Provide helpers that polyfill all methods defined in [iterator helpers proposal](https://github.com/tc39/proposal-iterator-helpers), both for `Iterator` and `AsyncIterator`, and even more.

string.prototype.endswith

A robust & optimized `String.prototype.endsWith` polyfill, based on the ECMAScript 6 specification.

error-cause

An ES-spec-compliant shim/polyfill/replacement for the `.cause` property on all Error types that works as far down as ES3

@4lolo/resize-observer-polyfill

A polyfill for the Resize Observer API

@ungap/custom-elements

All inclusive customElements polyfill for every browser

polyfill-object.fromentries

Object.fromEntries() polyfill

details-element-polyfill

HTML <details> element polyfill

webassemblyjs

WebAssembly interpreter

parsleyjs

Validate your forms, frontend, without writing a single line of javascript!

@webcomponents/scoped-custom-element-registry

Scoped CustomElementRegistry Polyfill

@ungap/event-target

An EventTarget polyfill

stream.finished

Polyfill/shim for stream.finished in node versions < v10

object.entries-ponyfill

`Object.entries()` ponyfill

ts-polyfill

Runtime polyfills for TypeScript libs, powered by core-js!

fetch-readablestream

Compatibility layer for efficient streaming of binary data using [WHATWG Streams](https://streams.spec.whatwg.org/)

react-anchor-link-smooth-scroll

React component for anchor links using the smoothscroll polyfill.

@oddbird/css-anchor-positioning

Polyfill for the proposed CSS anchor positioning spec

dynamic-import-polyfill

A polyfill for the native import() in the browser

es-set

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

disposablestack

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