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fix(core): always use hash for CSS module class names #10423

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merged 2 commits into from
Aug 21, 2024

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slorber
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@slorber slorber commented Aug 19, 2024

Motivation

For CSS modules, using clean class names in dev and hash in prod is confusing.

Users write CSS locally with selectors that only break after they deploy to production.

I believe it's better to have hashed class names in both environments to avoid this issue.

I consider this as a bugfix and an implementation detail.

Test Plan

CI + Argos

Test links

https://deploy-preview-10423--docusaurus-2.netlify.app/

@slorber slorber added pr: bug fix This PR fixes a bug in a past release. Argos Add this label to run UI visual regression tests. See argos.yml GH action. labels Aug 19, 2024
@slorber slorber requested a review from Josh-Cena as a code owner August 19, 2024 17:58
@facebook-github-bot facebook-github-bot added the CLA Signed Signed Facebook CLA label Aug 19, 2024
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slorber commented Aug 19, 2024

@Josh-Cena do you see any reason to keep the current behavior?

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@Josh-Cena
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One reason could be to easily see where a class name is coming from and thus change it. I don't think it's strong enough though and React dev tools is better. Another reason could be performance? Hash computation can be much slower.

Anyway you would also need to amend https://docusaurus.io/docs/styling-layout.

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@slorber
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slorber commented Aug 20, 2024

One reason could be to easily see where a class name is coming from and thus change it. I don't think it's strong enough though and React dev tools is better.

Agree 👍

The problem is:

  • we want to keep short class names in prod
  • we want to avoid CSS that works in dev but not in prod

Eventually, we could keep the longer name and add the hash in the middle of the class name in dev?

localIdentName: isProd
  ? `[local]_[contenthash:base64:4]`
-  : `[local]_[path][name]`,
+  : `[local]_[contenthash:base64:4]_[path][name]`,

I'm afraid adding the hash at the end would lead to devs writing selectors starting with [local]_[path][name] otherwise, leading to the same problem.

Another reason could be performance? Hash computation can be much slower.

According to my recent perf investigations, this is not at all a dev bottleneck currently, compared to other things like MDX and postcss

Anyway you would also need to amend docusaurus.io/docs/styling-layout.

👍 will do once we agree on the change to be made

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I'm +1 to make dev and prod consistent.

@slorber slorber merged commit 2b28b06 into main Aug 21, 2024
35 of 37 checks passed
@slorber slorber deleted the slorber/css-modules-use-hash-in-dev branch August 21, 2024 16:25
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