docs: improve "provide" documentation (#5554)

docs/config/index.md

@@ -974,29 +974,32 @@ Since Vitest 1.0.0-beta, global setup runs only if there is at least one running
 
 Beware that the global setup is running in a different global scope, so your tests don't have access to variables defined here. However, since 1.0.0 you can pass down serializable data to tests via `provide` method:
 
-```ts
-// globalSetup.js
+:::code-group
+```js [globalSetup.js]
 export default function setup({ provide }) {
   provide('wsPort', 3000)
 }
 ```
+```ts [globalSetup.ts]
+import type { GlobalSetupContext } from 'vitest/node'
 
-```ts
-// example.test.js
-import { inject } from 'vitest'
-
-inject('wsPort') === 3000
-```
-
-If you are using TypeScript, you can extend `ProvidedContext` type to have type safe access to `provide/inject` methods:
+export default function setup({ provide }: GlobalSetupContext) {
+  provide('wsPort', 3000)
+}
 
-```ts
+// You can also extend `ProvidedContext` type
+// to have type safe access to `provide/inject` methods:
 declare module 'vitest' {
   export interface ProvidedContext {
     wsPort: number
   }
 }
 ```
+```ts [example.test.js]
+import { inject } from 'vitest'
+
+inject('wsPort') === 3000
+```
 :::
 
 ### watchExclude<NonProjectOption />

packages/vitest/src/node/workspace.ts

@@ -114,7 +114,7 @@ export class WorkspaceProject {
     return this.ctx.getCoreWorkspaceProject() === this
   }
 
-  provide = (key: string, value: unknown) => {
+  provide = <T extends keyof ProvidedContext>(key: T, value: ProvidedContext[T]) => {
     try {
       structuredClone(value)
     }