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fix(rsbuild): restore StyleX HMR with runtime injection #515

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Merged
chenjiahan merged 1 commit into from
Oct 12, 2026
Merged

fix(rsbuild): restore StyleX HMR with runtime injection #515

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4 changes: 3 additions & 1 deletion rsbuild/stylex/README.md
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Expand Up @@ -2,7 +2,9 @@

Minimal example of using [StyleX](https://stylexjs.com/) with Rsbuild via the official [`@stylexjs/unplugin`](https://stylexjs.com/docs/learn/installation/rspack/) adapter.

The plugin compiles StyleX at build time and appends the generated CSS to the stylesheet emitted by Rsbuild's `CssExtractRspackPlugin` (fed by `src/index.css`). StyleX styles therefore stay in the normal CSS asset pipeline with content-hashed filenames, instead of a separate hardcoded `/stylex.css` link.
During development, `runtimeInjection` injects StyleX styles at runtime so style changes apply through HMR without a page refresh.

In production, runtime injection is disabled. The plugin compiles StyleX at build time and appends the generated CSS to the stylesheet emitted by Rsbuild's `CssExtractRspackPlugin` (fed by `src/index.css`), producing content-hashed CSS filenames instead of a separate hardcoded `/stylex.css` link.

This example uses `stylex.webpack()` (not `stylex.rspack()`) because `@stylexjs/unplugin` currently attaches CSS injection through the webpack-compatible hook; Rspack still runs that hook for plugins registered via `tools.rspack.plugins`.

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2 changes: 2 additions & 0 deletions rsbuild/stylex/rsbuild.config.ts
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Expand Up @@ -16,6 +16,8 @@ export default defineConfig({
// webpack-compatible plugins. The rspack() entry only runs transform.
stylex.webpack({
useCSSLayers: true,
// Inject styles during development so they update with HMR.
runtimeInjection: process.env.NODE_ENV === 'development',
}),
],
},
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