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Fix CSS resources being duplicated in app dir (#44168)
Currently, to get all the chunk files that contain a specific module in a build, we use `chunk.files`. However a module itself can be included by multiple chunks, or even chunks from different entries. Theoretically that's correct but in our architecture, we only need these chunks that are from the entry that is currently rendering. One solution is to add a 2-level key (the entry name) to modules in flight manifest, but that introduces too much size overhead to the manifest. So instead we leverage the `__entry_css_files__` field to generate a list of all files for a specific entry, and then find the intersection set of `{CSSFilesForEntry, CSSFilesForModule}` to get the corresponding CSS files for a specific Next.js entry. Also renamed `__entry_css__` to be more specific, and did some performance optimizations. NEXT-297 ## Bug - [ ] Related issues linked using `fixes #number` - [x] Integration tests added - [ ] Errors have a helpful link attached, see [`contributing.md`](https://github.com/vercel/next.js/blob/canary/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` - [ ] [e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs) tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have a helpful link attached, see [`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md) ## Documentation / Examples - [ ] Make sure the linting passes by running `pnpm build && pnpm lint` - [ ] The "examples guidelines" are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,5 @@ | ||
import Comp from '../comp' | ||
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||
export default function Page() { | ||
return <Comp /> | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,5 @@ | ||
import Comp from '../comp' | ||
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||
export default function Page() { | ||
return <Comp /> | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,7 @@ | ||
'use client' | ||
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import './style.css' | ||
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export default function Comp() { | ||
return <h1 className="red">Hello</h1> | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,3 @@ | ||
.red { | ||
color: red; | ||
} |
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