fix: reference chai types in every d.ts chunk (#11618)

Author: sheremet-va

packages/vitest/rollup.config.js

@@ -165,6 +165,16 @@ export default ({ watch }) =>
             }
           },
         },
+        {
+          // rollup-plugin-dts drops reference directives of .ts sources,
+          // so every chunk that uses the global `Chai` namespace loads @types/chai here
+          name: 'vitest-chai-type-reference',
+          renderChunk(code) {
+            if (/\bChai\./.test(code)) {
+              return `/// <reference types="chai" />\n${code}`
+            }
+          },
+        },
       ],
     },
   ])

pnpm-lock.yaml

@@ -0,0 +1,15 @@
+{
+  "name": "@vitest/test-integration-dts-chai-types",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "test": "pnpm test:ts5 && pnpm test:ts7",
+    "test:ts5": "node node_modules/typescript/bin/tsc -b --force tsconfig.json tsconfig.runtime.json",
+    "test:ts7": "node node_modules/typescript-7/bin/tsc -b --force tsconfig.json tsconfig.runtime.json"
+  },
+  "devDependencies": {
+    "typescript": "catalog:",
+    "typescript-7": "npm:typescript@^7.0.2",
+    "vitest": "workspace:*"
+  }
+}

test/e2e/dts/chai-types/package.json

@@ -0,0 +1,11 @@
+import type { Environment } from 'vitest/runtime'
+
+export default <Environment>{
+  name: 'custom',
+  viteEnvironment: 'ssr',
+  setup() {
+    return {
+      teardown() {},
+    }
+  },
+}

test/e2e/dts/chai-types/src/environment.ts

@@ -0,0 +1,11 @@
+import { assert, expect, test } from 'vitest'
+
+test('chai api', async () => {
+  expect('a').not.toBe('b')
+  expect(1).to.equal(1)
+  expect([1, 2]).to.not.include(3)
+  expect({ a: 1 }).to.have.property('a').that.is.a('number')
+  expect.soft(1).not.toBe(2)
+  await expect(Promise.resolve(1)).resolves.not.toBe(2)
+  assert.strictEqual(1, 1)
+})

test/e2e/dts/chai-types/src/expect.ts

@@ -0,0 +1,13 @@
+{
+  "extends": ["../_shared/tsconfig.patch.json"],
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "types": [],
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": false
+  },
+  "include": ["src/expect.ts"]
+}

test/e2e/dts/chai-types/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src/environment.ts"]
+}

test/e2e/dts/chai-types/tsconfig.runtime.json

@@ -11,6 +11,7 @@
     "declarationMap": true,
     "sourceMap": true,
     "verbatimModuleSyntax": true,
-    "skipLibCheck": false
+    "skipLibCheck": false,
+    "noEmit": true
   }
 }