fix: fix missing chai types (#7149)

Author: hi-ogawa

Diff for: packages/vitest/config.d.ts

@@ -1 +1,3 @@
+// ensure `@vitest/expect` provides `chai` types
+import type {} from '@vitest/expect'
 export * from './dist/config.js'

Diff for: pnpm-lock.yaml

@@ -0,0 +1,11 @@
+{
+  "name": "@vitest/test-dts-config",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "test": "tsc -b"
+  },
+  "devDependencies": {
+    "vitest": "workspace:*"
+  }
+}

Diff for: test/dts-config/package.json

@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "types": [],
+    "strict": true,
+    "noEmit": true
+  },
+  "include": ["vite.config.ts"]
+}

Diff for: test/dts-config/tsconfig.json

@@ -0,0 +1,3 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({})