feat: add ResolvedConfig.isBundled

Author: sapphi-red

packages/vite/src/node/config.ts

@@ -600,6 +600,8 @@ export interface ResolvedConfig
       cacheDir: string
       command: 'build' | 'serve'
       mode: string
+      /** `true` when build or full-bundle mode dev */
+      isBundled: boolean
       isWorker: boolean
       // in nested worker bundle to find the main config
       /** @internal */
@@ -1722,6 +1724,7 @@ export async function resolveConfig(
     cacheDir,
     command,
     mode,
+    isBundled: config.experimental?.fullBundleMode || isBuild,
     isWorker: false,
     mainConfig: null,
     bundleChain: [],