fix(rspeedy/plugin-react): mkdir main:background fails in windows

.changeset/dull-jokes-buy.md

@@ -0,0 +1,5 @@
+---
+"@lynx-js/react-rsbuild-plugin": patch
+---
+
+fix(rspeedy/plugin-react): mkdir main:background fails in windows

packages/rspeedy/plugin-react/src/entry.ts

@@ -78,18 +78,19 @@ export function applyEntry(
           : config.output?.filename
       ) ?? '[name].[platform].bundle'
 
+      // We do not use `${entryName}__background` since the default CSS name is `[name]/[name].css`.
+      // We would like to avoid adding `__background` to the output CSS filename.
+      const mainThreadEntry = `${entryName}__main-thread`
+
       const mainThreadName = path.join(
         isLynx
           // TODO: config intermediate
           ? DEFAULT_DIST_PATH_INTERMEDIATE
           // For non-Lynx environment, the entry is not deleted.
           // So we do not put it in the intermediate.
           : '',
-        `${entryName}/main-thread.js`,
+        `${mainThreadEntry}/main-thread.js`,
       )
-      // We do not use `${entryName}:main-thread` since the default CSS name is `[name]/[name].css`.
-      // We would like to avoid adding `:main-thread` to the output CSS filename.
-      const mainThreadEntry = entryName
 
       const backgroundName = path.join(
         isLynx
@@ -100,7 +101,7 @@ export function applyEntry(
           : '',
         getBackgroundFilename(entryName, environment.config, isProd),
       )
-      const backgroundEntry = `${entryName}:background`
+      const backgroundEntry = entryName
 
       mainThreadChunks.push(mainThreadName)
 

packages/rspeedy/plugin-react/src/splitChunks.ts

@@ -93,7 +93,7 @@ export const applySplitChunksRule = (
     rspackConfig.optimization.splitChunks.chunks = function chunks(chunk) {
       // TODO: support `splitChunks.chunks: 'async'`
       // We don't want main thread to be splitted
-      return Boolean(chunk.name?.includes(':background'))
+      return !chunk.name?.includes('__main-thread')
     }
     return rspackConfig
   })