diff --git a/.build/tsconfig.json b/.build/tsconfig.json
index f6d151246..dd3aae7b7 100644
--- a/.build/tsconfig.json
+++ b/.build/tsconfig.json
@@ -7,6 +7,7 @@
     "types": ["node"],
     "strict": true,
     "noEmit": true,
+    "allowImportingTsExtensions": true,
     "esModuleInterop": true,
     "allowSyntheticDefaultImports": true,
     "resolveJsonModule": true,
diff --git a/.build/vite.config.helper.ts b/.build/vite.config.helper.mts
similarity index 100%
rename from .build/vite.config.helper.ts
rename to .build/vite.config.helper.mts
diff --git a/core/.build/vite.config.mts b/core/.build/vite.config.mts
index dd6b96ad0..f11c645bd 100644
--- a/core/.build/vite.config.mts
+++ b/core/.build/vite.config.mts
@@ -1,7 +1,7 @@
 import path from 'node:path'
 import process from 'node:process'
 import { fileURLToPath } from 'node:url'
-import { createViteConfig } from '../../.build/vite.config.helper'
+import { createViteConfig } from '../../.build/vite.config.helper.mts'
 import getBanner from '../../shared/banner/index.mjs'
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url))