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This PR adds a new `experimental.enableUndici` option to let the developer switch from `next-fetch` to `undici` as the underlying polyfill for `fetch` in Node.js. In the current implementation, Next.js makes sure that `fetch` is always available by using `node-fetch`. However, we do not polyfill in Node.js 18+, since those versions come with their own `fetch` implementation already, built-in. Node.js 18+ uses `undici` under the hood, so letting the developer use `undici` earlier could make the migration easier later on. Eventually, we hope to be able to stop polyfilling `fetch` in an upcoming major version of Next.js, shipping less code. ## Bug - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Errors have helpful link attached, see `contributing.md` ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes by running `pnpm lint` - [ ] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples) Co-authored-by: Balázs Orbán <info@balazsorban.com> Co-authored-by: Sukka <isukkaw@gmail.com> Co-authored-by: JJ Kasper <jj@jjsweb.site> Co-authored-by: Steven <steven@ceriously.com> |
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