Standard Library

• UpdatedMar 16, 2025
• JavaScript

🐕 Bare minimum 500b fetch polyfill.

• UpdatedJul 23, 2023
• JavaScript

Promise packages, patterns, chat, and tutorials

• UpdatedApr 25, 2024

A polyfill for the Resize Observer API

• UpdatedJan 27, 2023
• JavaScript

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

• UpdatedMar 5, 2024
• JavaScript

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

• UpdatedMar 16, 2025
• JavaScript

🦄 Like polyfill but with pony pureness

• UpdatedFeb 6, 2024

Polyfills the ResizeObserver API.

• UpdatedJun 29, 2023
• TypeScript

📋 Simple copying on the web, with maximum browser compatibility. (You probably don't need this anymore!)

• UpdatedFeb 12, 2025
• TypeScript

A pure JS in-memory implementation of the IndexedDB API

• UpdatedAug 19, 2024
• JavaScript

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

• UpdatedDec 10, 2024
• JavaScript

Web Streams, based on the WHATWG spec reference implementation

• UpdatedFeb 20, 2025
• TypeScript

WHATWG fetch ponyfill

• UpdatedJan 25, 2022
• JavaScript

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

• UpdatedJun 13, 2023
• JavaScript

Spec-compliant FormData implementation for Node.js

• UpdatedNov 18, 2024
• TypeScript

🎙MediaRecorder ponyfill that records audio as mp3

• UpdatedMar 26, 2024
• TypeScript

🖥 A screen.orientation ponyfill

• UpdatedDec 8, 2022
• JavaScript

Object.fromEntries() ponyfill (in 6 lines)

• UpdatedNov 4, 2020
• JavaScript

Ponyfill for Error#captureStackTrace

• UpdatedOct 10, 2022
• JavaScript

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

• UpdatedJan 24, 2021
• JavaScript