feat: disable minify by default in full bundle mode

Author: sapphi-red

packages/vite/src/node/build.ts

@@ -401,6 +401,7 @@ export function resolveBuildEnvironmentOptions(
   raw: BuildEnvironmentOptions,
   logger: Logger,
   consumer: 'client' | 'server' | undefined,
+  isFullBundledDev: boolean,
 ): ResolvedBuildEnvironmentOptions {
   const deprecatedPolyfillModulePreload = raw.polyfillModulePreload
   const { polyfillModulePreload, ...rest } = raw
@@ -421,7 +422,7 @@ export function resolveBuildEnvironmentOptions(
     {
       ...buildEnvironmentOptionsDefaults,
       cssCodeSplit: !raw.lib,
-      minify: consumer === 'server' ? false : 'oxc',
+      minify: consumer === 'server' || isFullBundledDev ? false : 'oxc',
       rollupOptions: {
         platform: consumer === 'server' ? 'node' : 'browser',
       },

packages/vite/src/node/config.ts

@@ -825,6 +825,7 @@ function resolveEnvironmentOptions(
   forceOptimizeDeps: boolean | undefined,
   logger: Logger,
   environmentName: string,
+  isFullBundledDev: boolean,
   // Backward compatibility
   isSsrTargetWebworkerSet?: boolean,
   preTransformRequests?: boolean,
@@ -887,6 +888,7 @@ function resolveEnvironmentOptions(
       options.build ?? {},
       logger,
       consumer,
+      isFullBundledDev,
     ),
     plugins: undefined!, // to be resolved later
     // will be set by `setOptimizeDepsPluginNames` later
@@ -1456,6 +1458,9 @@ export async function resolveConfig(
     config.ssr?.target === 'webworker',
   )
 
+  const isFullBundledDev =
+    command === 'serve' && !!config.experimental?.fullBundleMode
+
   // Backward compatibility: merge config.environments.client.resolve back into config.resolve
   config.resolve ??= {}
   config.resolve.conditions = config.environments.client.resolve?.conditions
@@ -1472,6 +1477,7 @@ export async function resolveConfig(
       inlineConfig.forceOptimizeDeps,
       logger,
       environmentName,
+      isFullBundledDev,
       config.ssr?.target === 'webworker',
       config.server?.preTransformRequests,
     )
@@ -1495,6 +1501,7 @@ export async function resolveConfig(
     config.build ?? {},
     logger,
     undefined,
+    isFullBundledDev,
   )
 
   // Backward compatibility: merge config.environments.ssr back into config.ssr