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A small polyfill for Object.setprototypeof

ES2015 (ES6) Number.isInteger polyfill

Externalise references to helpers and builtins, automatically polyfilling your code without polluting globals

> Polyfill/shim for `process.allowedNodeEnvironmentFlags`

A JSON polyfill for older JavaScript platforms.

A cross platform Promise.allSettled polyfill

Web Streams, based on the WHATWG spec reference implementation

A window.fetch polyfill.

Polyfill URL and URLSearchParams

babel's modular runtime helpers with core-js@2 polyfilling

Bare minimum fetch polyfill in 500 bytes

Externalise references to helpers and builtins, automatically polyfilling your code without polluting globals

Backwards compatibility polyfill for React class components

A standard library polyfill for ES Modules supporting browsers (Edge 16+, Firefox 60+, Chrome 61+, Safari 10.1+)

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

A polyfill for non-dead, nomodule browsers.

Runtime and polyfill for wasm targets

ES6 next big thing polyfilled before it gets real

ECMAScript6 Map polyfill

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

TypedArray polyfill for old browsers

ECMAScript 2015 (ES6) Object.assign polyfill and ponyfill

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

A Babel plugin to inject imports to core-js@3 polyfills

A Babel plugin to inject imports to regenerator-runtime

A Babel plugin to inject imports to core-js@2 polyfills

Polyfill for ES6 Promise

ServiceWorker CacheQueryOptions polyfill (ignoreSearch)

Cache polyfill for the ServiceWorker