fix(vitest,runner): simplify test.extend type exports

packages/runner/src/types/tasks.ts

@@ -411,11 +411,11 @@ interface ExtendedAPI<ExtraContext> {
   runIf: (condition: any) => ChainableTestAPI<ExtraContext>
 }
 
-export type CustomAPI<ExtraContext = object> = ChainableTestAPI<ExtraContext> &
+export type TestAPI<ExtraContext = object> = ChainableTestAPI<ExtraContext> &
   ExtendedAPI<ExtraContext> & {
     extend: <T extends Record<string, any> = object>(
       fixtures: Fixtures<T, ExtraContext>
-    ) => CustomAPI<{
+    ) => TestAPI<{
       [K in keyof T | keyof ExtraContext]: K extends keyof T
         ? T[K]
         : K extends keyof ExtraContext
@@ -424,7 +424,7 @@ export type CustomAPI<ExtraContext = object> = ChainableTestAPI<ExtraContext> &
     }>
   }
 
-export type TestAPI<ExtraContext = object> = CustomAPI<ExtraContext>
+export type { TestAPI as CustomAPI }
 
 export interface FixtureOptions {
   /**

test/dts-fixture/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "@vitest/test-dts-fixture",
+  "private": true,
+  "scripts": {
+    "build": "rm -rf dist && tsc -p tsconfig.json",
+    "check": "tsc -p tsconfig.check.json",
+    "test": "pnpm build && pnpm check"
+  },
+  "devDependencies": {
+    "vitest": "workspace:*"
+  }
+}

test/dts-fixture/src/repro.ts

@@ -0,0 +1,7 @@
+import { test } from 'vitest'
+
+export const myTest = test.extend<{ now: number }>({
+  now: async ({}, use) => {
+    await use(Date.now())
+  },
+})

test/dts-fixture/tsconfig.check.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    // TODO: type check fails with NodeNext. probably we should fix this.
+    //  ../../packages/vitest/index.d.cts:1:15 - error TS1479: The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import("./dist/index.js")' call instead.
+    //  1 export * from './dist/index.js'
+    //                  ~~~~~~~~~~~~~~~~~
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "types": [],
+    "strict": true,
+    "noEmit": true,
+    "verbatimModuleSyntax": true
+  },
+  "include": ["dist"]
+}

test/dts-fixture/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "declaration": true,
+    "declarationMap": true,
+    "outDir": "dist",
+    "sourceMap": true,
+    "verbatimModuleSyntax": true
+  },
+  "include": ["src"]
+}