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docs: document createFetch custom fetch option#603
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The `createFetch` function accepts a `fetch` option in `CreateFetchOptions` that allows passing a custom fetch implementation. This is useful for providing a Node.js-compatible fetch (e.g. undici), a service worker's fetch, or a test mock — but was not documented in the README. Closes unjs#533 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Fixes #533
The
createFetchfunction accepts afetchoption inCreateFetchOptionsthat lets you provide a custom fetch implementation. This is useful for Node.js-compatible fetch (e.g.undici), service worker fetch, or test mocks — but it was completely undocumented in the README.Changes
README.md: Added a new "🔧 Using a custom fetch implementation" section after "Create fetch with default options", showing how to usecreateFetch({ fetch: customImpl })with a basic example and a practicalundiciexample.Test plan
Summary by CodeRabbit
ofetchinstance.fetchfunction and usingundici’sfetchin Node.js.