diff --git a/packages/vitest/index.cjs b/packages/vitest/index.cjs
index e69de29bb2d1..85fc303f76c6 100644
--- a/packages/vitest/index.cjs
+++ b/packages/vitest/index.cjs
@@ -0,0 +1,5 @@
+throw new Error(
+  'Vitest cannot be imported in a CommonJS module using require(). Please use "import" instead.'
+  + '\n\nIf you are using "import" in your source code, then it\'s possible it was bundled into require() automatically by your bundler. '
+  + 'In that case, do not bundle CommonJS output since it will never work with Vitest, or use dynamic import() which is available in all CommonJS modules.',
+)