Polyfills and shims

12-month change compares the average of the last 4 weeks of downloads with the first 4 weeks of the 52-week series. Gzip size is for the whole package, as measured by Bundlephobia. "-" means the value has not been fetched.

• es-aggregate-errorES Proposal spec-compliant shim for AggregateError
• @zxing/text-encodingPolyfill for the Encoding Living Standard's API.
• launchdarkly-eventsourceFork of eventsource package - W3C compliant EventSource client for Node.js and browser (polyfill)
• node-polyfill-webpack-pluginPolyfill Node.js core modules in Webpack.
• native-promise-onlyNative Promise Only: A polyfill for native ES6 Promises **only**, nothing else.
• abortcontroller-polyfillPolyfill/ponyfill for the AbortController DOM API + optional patching of fetch (stub that calls catch, doesn't actually abort request).
• broadcast-channelA BroadcastChannel that works in New Browsers, Old Browsers, WebWorkers, NodeJs, Deno and iframes
• capture-stack-traceError.captureStackTrace ponyfill
• isomorphic-unfetchSwitches between unfetch & node-fetch for client & server.
• es6-setECMAScript6 Set polyfill
• path2dPath2D API for node. Can be used for server-side rendering with canvas
• set-immediate-shimSimple setImmediate shim
• text-encodingPolyfill for the Encoding Living Standard's API.
• @petamoriken/float16IEEE 754 half-precision floating-point for JavaScript
• react-native-get-random-valuesA 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.
• any-observableSupport any Observable library and polyfill
• typedarray.prototype.sliceES spec-compliant shim for TypedArray.prototype.slice
• array.prototype.mapAn ES5 spec-compliant `Array.prototype.map` shim/polyfill/replacement that works as far down as ES3.
• fastestsmallesttextencoderdecoderThe fastest smallest Javascript polyfill for the encode of TextEncoder and decode of TextDecoder for UTF-8 only. Made by AnonyCo with ❤️ from 🐕s.
• promise.allsettledES Proposal spec-compliant shim for Promise.allSettled
• es6-object-assignECMAScript 2015 (ES6) Object.assign polyfill and ponyfill
• event-source-polyfillA polyfill for http://www.w3.org/TR/eventsource/
• es6-mapECMAScript6 Map polyfill
• barcode-detectorA Barcode Detection API polyfill that uses ZXing webassembly under the hood
• os-shimNative OS module API shim for older node.js versions
• @formatjs/intl-displaynamesPolyfill for: https://tc39.es/proposal-intl-displaynames
• async-listenerPolyfill exporting trevnorris's 0.11+ asyncListener API.
• string.prototype.trimleftES2019 spec-compliant String.prototype.trimLeft shim.
• string.prototype.trimrightES2019 spec-compliant String.prototype.trimLeft shim.
• array.prototype.findArray.prototype.find ES6 polyfill.
• crypto-randomuuidPolyfill crypto.randomUUID
• uglify-esJavaScript parser, mangler/compressor and beautifier toolkit for ES6+
• @ungap/promise-all-settledA cross platform Promise.allSettled polyfill
• array-fromA ponyfill for the ES 2015 (ES6) `Array.from()`.
• es6-shimECMAScript 6 (Harmony) compatibility shims for legacy JavaScript engines
• string.fromcodepointA robust & optimized `String.fromCodePoint` polyfill, based on the ECMAScript 6 specification.
• @sanity/eventsourceEventSource polyfill for browser and node.js
• vite-plugin-node-polyfillsA Vite plugin to polyfill Node's Core Modules for browser environments.
• @nevware21/ts-utilsComprehensive 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
• es5-shimECMAScript 5 compatibility shims for legacy JavaScript engines
• composed-offset-positionThis provides a set of ponyfills to achieve the same behavior of `offsetParent`, `offsetLeft` and `offsetTop` before the `offsetParent` spec was changed.
• weak-mapA WeakMap shim for Node.js and browsers
• weakmap-polyfillECMAScript6 WeakMap polyfill
• create-react-contextPolyfill for the proposed React context API
• path2d-polyfillPolyfills Path2D api for canvas rendering
• array.prototype.filterAn ES5 spec-compliant `Array.prototype.filter` shim/polyfill/replacement that works as far down as ES3.
• find-indexfinds an item in an array matching a predicate function, and returns its index
• audio-bufferAudioBuffer ponyfill with operations toolkit
• string.prototype.padstartES2017 spec-compliant String.prototype.padStart shim.
• array.prototype.toreversedAn ESnext spec-compliant `Array.prototype.toReversed` shim/polyfill/replacement that works as far down as ES3.

• scroll-into-view-if-needed vs @juggle/resize-observer
• css-vars-ponyfill vs object-fit-images