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vitepress/docs/config/introduction.md

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# Introduction
Place your configuration file at `.vitepress/config.js`. This is where all VitePress-specific files will be placed.
```
.
├─ docs
│ ├─ .vitepress
│ │ └─ config.js
│ └─ index.md
└─ package.json
```
## Config Intellisense
Since VitePress ships with TypeScript typings, you can leverage your IDE's intellisense with jsdoc type hints:
```js
/**
* @type {import('vitepress').UserConfig}
*/
const config = {
// ...
}
export default config
```
Alternatively, you can use the `defineConfig` helper at which should provide intellisense without the need for jsdoc annotations:
```js
import { defineConfig } from 'vitepress'
export default defineConfig({
// ...
})
```
VitePress also directly supports TS config files. You can use `.vitepress/config.ts` with the `defineConfig` helper as well.
## Typed Theme Config
By default, `defineConfig` helper leverages the theme config type from default theme:
```ts
import { defineConfig } from 'vitepress'
export default defineConfig({
themeConfig: {
// Type is `DefaultTheme.Config`
}
})
```
If you use a custom theme and want type checks for the theme config, you'll need to use `defineConfigWithTheme` instead, and pass the config type for your custom theme via a generic argument:
```ts
import { defineConfigWithTheme } from 'vitepress'
import { ThemeConfig } from 'your-theme'
export default defineConfigWithTheme<ThemeConfig>({
themeConfig: {
// Type is `ThemeConfig`
}
})
```