perf(css): improve postcss config resolve #12484
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bluwy
added
feat: css
p4-important
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bluwy
commented
Mar 19, 2023
Comment on lines
-806
to
+809
| const postcssConfig = await resolvePostcssConfig(config, getCssDialect(lang)) | ||
| const postcssConfig = await resolvePostcssConfig(config) |
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Dialect option can be removed as it was only separated because sugarss mutates the config to add the sugarss parser. Down the code I've refactored to not mutate the config so we can keep a single cache as before.
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This is awesome 🔥 |
patak-dev
reviewed
Mar 19, 2023
ArnaudBarre
previously approved these changes
Mar 19, 2023
Co-authored-by: patak <[email protected]>
patak-dev
approved these changes
Mar 20, 2023
sapphi-red
approved these changes
Mar 21, 2023
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Description
With many parallel CSS file requests (especially with
preTransformRequest), each CSS will try to resolve thepostcssconfig because the cache has not been filled. This is slow as we only need one CSS file to resolve it, while others can wait for that one result. Otherwise all CSS files will resolve their own postcss config at once, causing slowness.On top of that,
postcss-load-configtakes strangely long to load (2s for me), especially if you don't have a config at all. So we need to reduce calling it.This PR does the above by caching the promise of the config resolve, instead of it's result.
Additional context
Debugging the slowness in https://github.com/sveltejs/vite-plugin-svelte/tree/main/packages/playground/big
What is the purpose of this pull request?
Before submitting the PR, please make sure you do the following
fixes #123).