---
title: provide | Config
outline: deep
---

# provide

- **Type:** `Partial<ProvidedContext>`

Define values that can be accessed inside your tests using `inject` method.

:::code-group

```ts [vitest.config.js]
import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    provide: {
      API_KEY: '123',
    },
  },
})
```

```ts [api.test.js]
import { expect, inject, test } from 'vitest'

test('api key is defined', () => {
  expect(inject('API_KEY')).toBe('123')
})
```

:::

::: warning
Properties have to be strings and values need to be [serializable](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm#supported_types) because this object will be transferred between different processes.
:::

::: tip
If you are using TypeScript, you will need to augment `ProvidedContext` type for type safe access:

```ts [vitest.shims.d.ts]
declare module 'vitest' {
  export interface ProvidedContext {
    API_KEY: string
  }
}

// mark this file as a module so augmentation works correctly
export {}
```

:::