Top 25 ponyfill open source projects

Standard Library

Tiny library (<200B gzip) for deferring something by a "tick"

WHATWG fetch ponyfill

A polyfill for the Resize Observer API

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

[DEPRECATED] Node.js `os.homedir()` ponyfill

[DEPRECATED] Node.js os.tmpdir() ponyfill

🦄 Like polyfill but with pony pureness

Element.scrollIntoView ponyfills for things like "if-needed" and "smooth"

📋 Simple copying on the web, with maximum browser compatibility.

🐕 Bare minimum 500b fetch polyfill.

Polyfills the ResizeObserver API.

A pure JS in-memory implementation of the IndexedDB API

Promise packages, patterns, chat, and tutorials

Polyfill for the AbortController DOM API and abortable fetch (stub that calls catch, doesn't actually abort request).

Web Streams, based on the WHATWG spec reference implementation

Object.fromEntries() ponyfill (in 6 lines)

(A smaller) polyfill for the react context API

ES2015 Number.isSafeInteger() ponyfill

Universal LocalStorage for browser and Node.js.

Spec-compliant FormData implementation for Node.js

🖥 A screen.orientation ponyfill

FormData.entries ponyfill

Ponyfill and helpers for the standardized Error Causes

ES2015 Number.MAX_SAFE_INTEGER ponyfill