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Runtime Requirements

Node.js

Minimum: Node.js 20 (package.json engines: >=20.0.0)
Recommended: Node.js 22 LTS (or newer active LTS)
Tested in CI: Node.js 20, 22, and 24

Uses native global fetch, AbortController, and DOM Headers (Node.js 20+). Node.js 18 is not supported.

Browser

Chrome 67+, Firefox 69+, Safari 14+, Edge 79+
Browser-specific build via browser export condition.

Deno

Compatible with Deno 1.28+

Bun

Compatible with Bun 1.0+

Polyfills

For environments without fetch:

import { Polyfill } from 'whatwg-fetch';
globalThis.fetch = Polyfill;