feat: enable preserveEntrySignatures (#253)

Author: sapphi-red

packages/vite/src/node/build.ts

@@ -608,11 +608,11 @@ async function buildEnvironment(
   )
 
   const rollupOptions: RolldownOptions = {
-    // preserveEntrySignatures: ssr
-    //   ? 'allow-extension'
-    //   : libOptions
-    //     ? 'strict'
-    //     : false,
+    preserveEntrySignatures: ssr
+      ? 'allow-extension'
+      : libOptions
+        ? 'strict'
+        : false,
     // cache: options.watch ? undefined : false,
     ...options.rollupOptions,
     output: options.rollupOptions.output,

packages/vite/src/node/plugins/worker.ts

@@ -102,22 +102,14 @@ async function bundleWorkerEntry(
       injectEnvironmentToHooks(workerEnvironment, chunkMetadataMap, p),
     ),
     onLog(level, log) {
-      if (
-        log.code === 'MIXED_EXPORT' ||
-        log.code === 'MISSING_NAME_OPTION_FOR_IIFE_EXPORT'
-      ) {
-        // these warning will be output because `preserveEntrySignatures` is not supported by rolldown
-        // suppress these warnings as users do not need to care about it
-        return
-      }
       onRollupLog(level, log, workerEnvironment)
     },
     // TODO: remove this and enable rolldown's CSS support later
     moduleTypes: {
       '.css': 'js',
       ...rollupOptions.moduleTypes,
     },
-    // preserveEntrySignatures: false,
+    preserveEntrySignatures: false,
   })
   let chunk: OutputChunk
   try {

playground/multiple-entrypoints/vite.config.js

@@ -6,7 +6,7 @@ export default defineConfig({
     outDir: './dist',
     emptyOutDir: true,
     rollupOptions: {
-      // preserveEntrySignatures: 'strict',
+      preserveEntrySignatures: 'strict',
       input: {
         a0: resolve(__dirname, 'entrypoints/a0.js'),
         a1: resolve(__dirname, 'entrypoints/a1.js'),