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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

Node.js 0.12 path.isAbsolute() ponyfill

> 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.

Symbol.observable ponyfill

Runtime and polyfill for wasm targets

ES6 next big thing polyfilled before it gets real

A [ponyfill](https://ponyfill.com) for `Buffer.from`, uses native implementation if available.

Node.js 0.12 fs.access() & fs.accessSync() ponyfill

ECMAScript6 Map polyfill

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

Get the first fulfilled promise that satisfies the provided testing function

Make a promise always fulfill with its actual fulfillment value or rejection reason

TypedArray polyfill for old browsers

ECMAScript 2015 (ES6) Object.assign polyfill and ponyfill

A [ponyfill](https://ponyfill.com) for `Buffer.alloc`.