next.js

2c1043eb - Turbopack: Allow Pages entrypoint template to import user's `.ts` files (#55296)

Turbopack: Allow Pages entrypoint template to import user's `.ts` files (#55296) ### What? This adds an exception for the entrypoint templates directory which will prevent the restricted resolve options from taking over. So, the templates entrypoint will be able to import with the user's default resolve options, which enables a `_app.ts` import. ### Why? The entrypoint templates need to be able to import the user's code as if the template were use code itself. ### How? The [Pages entrypoint](https://github.com/vercel/next.js/blob/85d30b62db4606bf56a6a9533494c9e14d55e1cc/packages/next/src/build/templates/pages.ts#L9-L10) template [imports the user's `_app` file](https://github.com/vercel/next.js/blob/85d30b62db4606bf56a6a9533494c9e14d55e1cc/packages/next-swc/crates/next-core/src/next_pages/page_entry.rs#L83-L84) via a special `@vercel/turbopack-next/pages/_app` which is [import mapped](https://github.com/vercel/next.js/blob/85d30b62db4606bf56a6a9533494c9e14d55e1cc/packages/next-swc/crates/next-core/src/next_import_map.rs#L404-L411) to the user's `/pages/_app` file. If the user is using `/pages/_app.js` file, everything is OK. But a problem pops up if the user is using a `.ts` (or similar non-standard extension). Why? In order to prevent a foobar node modules from importing TS/CSS/etc files, we apply a restricted set of `ResolveOptions` when the base file (the file that is doing the import) is inside a `node_modules` directory. In this case, we stop allowing `.ts`/`.tsx`/`.css` file extension imports and only allow `.js`/`.json`/`.node` (the standard node extensions). Well, the shared entrypoint templates are _technically_ inside the `node_modules/next/dist/esm/build/templates/` directory, ie they are node modules. So we applied the restricted resolve options when it was importing `@vercel/turbopack-next/pages/_app`. Even though we're able to correctly read the user's `/pages` directory, we ignore a `/pages/_app.ts` file that would otherwise be found if the user code did the import. Depends on https://github.com/vercel/turbo/pull/5938. Closes WEB-1545