Scripts: Make React Fast Refresh work with multiple blocks #64924
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Flaky tests detected in 3d031a4. 🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/12135432278
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…#64924) * Scripts: Make React Fast Refresh Work with multiple blocks * Properly pass the unique name for the build and updates test snapshots * Apply suggestions from code review * Add changelog entry Co-authored-by: gziolo <[email protected]> Co-authored-by: sirreal <[email protected]>
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* Scripts: Make React Fast Refresh Work with multiple blocks * Properly pass the unique name for the build and updates test snapshots * Apply suggestions from code review * Add changelog entry Co-authored-by: gziolo <[email protected]> Co-authored-by: sirreal <[email protected]>
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What?
Related to #25188.
Follow-up for #28273.
Related comments:
wp-scripts start --hotworks perfectly fine with a single entry point that contains all the logic used in the editor. It starts to break if multiple entry points get loaded in the project editor. A perfect example would be a plugin with numerous blocks where each of them loads JavaScript separately. The workaround so far was to bundle all JavaScript code for the editor together. However, it isn’t always the most efficient approach. Besides, it would be great if that worked out of the box, no matter how configured the entry points were.Screenshot from #25188 (comment):
Why?
Source: https://github.com/pmmmwh/react-refresh-webpack-plugin/blob/main/docs/TROUBLESHOOTING.md#component-not-updating-with-bundle-splitting-techniques
How?
In the development mode when React Fast Refresh is enabled, there is a shared runtime created. This way it acts as en entry point for existing scripts that orchestrates all updates with hot-module replacement for React code.
Known Issues
It looks like CSS support for hot-module reloading doesn't work anymore in
trunkand with this branch. I will investigate this separately as it is unrelated to these changes. I found an issue that seems very similar webpack-contrib/mini-css-extract-plugin#1089. My debugging session pointed me in the direction thatmini-css-extract-pluginis unable to correctly match the url of CSS file in thelinktags with these coming from hot reload. The reason seems to originate from the fact that the asset version appended to the url confuses the plugin.Testing Instructions
Create a new test plugin with more than one block. You can do it as follows:
npx wp-create-block my-plugin --no-wp-scripts.npx wp-create-block my-block --no-pluginis helpful here.cd my-plugin ../node_modules/.bin/wp-scripts start --hot