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.

• has-symbolsDetermine if the JS environment has Symbol support. Supports spec, or shams.
• object-assignES2015 `Object.assign()` ponyfill
• path-parseNode.js path.parse() ponyfill
• setprototypeofA small polyfill for Object.setprototypeof
• queue-microtaskfast, tiny `queueMicrotask` shim for modern engines
• p-try`Start a promise chain
• core-util-isThe `util.is*` functions introduced in Node v0.12.
• object-keysAn Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim
• object.assignES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim
• path-is-absoluteNode.js 0.12 path.isAbsolute() ponyfill
• fs.realpathUse node's fs.realpath, but fall back to the JS implementation if the native one fails
• regexp.prototype.flagsES6 spec-compliant RegExp.prototype.flags shim.
• es-to-primitiveECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.
• string.prototype.trimendES2019 spec-compliant String.prototype.trimEnd shim.
• globalthisECMAScript spec-compliant polyfill/shim for `globalThis`
• string.prototype.trimstartES2019 spec-compliant String.prototype.trimStart shim.
• function.prototype.nameAn ES2015 spec-compliant `Function.prototype.name` shim
• array-buffer-byte-lengthGet the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.
• string.prototype.trimES5 spec-compliant shim for String.prototype.trim
• arraybuffer.prototype.sliceES spec-compliant shim for ArrayBuffer.prototype.slice
• reflect.getprototypeofAn ES2015 mostly-spec-compliant `Reflect.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible
• array-includesAn ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.
• object.valuesES2017 spec-compliant Object.values shim.
• regenerator-runtimeRuntime for Regenerator-compiled generator and async functions.
• web-streams-polyfillWeb Streams, based on the WHATWG spec reference implementation
• array.prototype.flatAn ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.
• array.prototype.flatmapAn ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
• object.fromentriesES proposal-spec-compliant Object.fromEntries shim.
• object.entriesES2017 spec-compliant Object.entries shim.
• string.prototype.matchallSpec-compliant polyfill for String.prototype.matchAll
• event-target-shimAn implementation of WHATWG EventTarget interface.
• @tybys/wasm-utilWASI polyfill for browser and some wasm util
• es-iterator-helpersAn ESnext spec-compliant iterator helpers shim/polyfill/replacement that works as far down as ES3.
• array.prototype.tosortedAn ESnext spec-compliant `Array.prototype.toSorted` shim/polyfill/replacement that works as far down as ES3.
• formdata-polyfillHTML5 `FormData` for Browsers and Node.
• css.escapeA robust polyfill for the `CSS.escape` utility method as defined in CSSOM.
• array.prototype.findlastAn ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.
• array.prototype.findlastindexAn ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.
• string.prototype.repeatA robust & optimized `String.prototype.repeat` polyfill, based on the ECMAScript 6 specification.
• object.groupbyAn ESnext spec-compliant `Object.groupBy` shim/polyfill/replacement that works as far down as ES3.
• require-main-filenameshim for require.main.filename() that works in as many environments as possible
• utilNode.js's util module for all engines
• string.prototype.includesA robust & optimized `String.prototype.includes` polyfill, based on the ECMAScript 6 specification.
• create-requirePolyfill for Node.js module.createRequire (<= v12.2.0)
• p-finally`Promise#finally()` ponyfill - Invoked when the promise is settled regardless of outcome
• typedarrayTypedArray polyfill for old browsers
• object-isES2015-compliant shim for Object.is - differentiates between -0 and +0
• @sec-ant/readable-streamA tiny, zero-dependency yet spec-compliant asynchronous iterator polyfill/ponyfill for ReadableStreams.
• os-tmpdirNode.js os.tmpdir() ponyfill
• rafrequestAnimationFrame polyfill for node and the browser

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