fix(browser): throw an error if "@vitest/browser/context" is imported…

… outside of the browser mode

packages/browser/context.js

@@ -1,2 +1,18 @@
-// empty file to not break bundling
 // Vitest resolves "@vitest/browser/context" as a virtual module instead
+
+// fake exports for static analysis
+export const page = null
+export const server = null
+export const userEvent = null
+export const cdp = null
+export const commands = null
+
+const pool = globalThis.__vitest_worker__?.ctx?.pool
+
+throw new Error(
+  // eslint-disable-next-line prefer-template
+  '@vitest/browser/context can be imported only inside the Browser Mode. '
+  + (pool
+    ? `Your test is running in ${pool} pool. Make sure your regular tests are excluded from the "test.include" glob pattern.`
+    : 'Instead, it was imported outside of Vitest.'),
+)