# TypeScript Support

Docusaurus is written in TypeScript and provides first-class TypeScript support.

The minimum required version is **TypeScript 6.0**.

## Initialization

Docusaurus supports writing and using TypeScript theme components. If the init template provides a TypeScript variant, you can directly [initialize a site](/guides/installation#scaffold-project-website) with full TypeScript support by using the `--typescript` flag.

```bash npm2yarn
npx create-docusaurus@latest my-website classic --typescript
```

Below are some guides on how to migrate an existing project to TypeScript.

## Setup

Add the following packages to your project:

```bash npm2yarn
npm install --save-dev typescript @docusaurus/module-type-aliases @docusaurus/tsconfig @docusaurus/types @types/node
```

Then add `tsconfig.json` to your project root with the following content:

```json title="tsconfig.json"
{
  "extends": "@docusaurus/tsconfig",
  "compilerOptions": {
    "types": ["node"]
  }
}
```

Docusaurus doesn't use this `tsconfig.json` to compile your project. It is added just for a nicer Editor experience, although you can choose to run `tsc` to type check your code for yourself or on CI.

Now you can start writing TypeScript theme components.

## Ambient types for optional plugins

Some plugins and themes ship their own ambient `.d.ts` files that TypeScript does not load automatically.

For example, importing from `@theme/Playground` (provided by `@docusaurus/theme-live-codeblock`) fails with `TS2307: Cannot find module '@theme/Playground'` until you opt the plugin's types in.

Add a triple-slash reference in a project `.d.ts` file (recommended):

```ts title="src/types.d.ts"
/// <reference types="@docusaurus/theme-live-codeblock" />
```

Alternatively, add the package to the `types` compiler option of your `tsconfig.json`:

```json title="tsconfig.json" {4}
{
  "extends": "@docusaurus/tsconfig",
  "compilerOptions": {
    "types": ["node", "@docusaurus/theme-live-codeblock"]
  }
}
```

The same applies to any other optional plugin or theme that ships ambient types.

## Typing the config file

It is possible to use a TypeScript config file in Docusaurus.

```ts title="docusaurus.config.ts" {4,15,21}
import type {Config} from '@docusaurus/types';
import type * as Preset from '@docusaurus/preset-classic';

const config: Config = {
  title: 'My Site',
  favicon: 'img/favicon.ico',

  /* Your site config here */

  presets: [
    [
      'classic',
      {
        /* Your preset config here */
      } satisfies Preset.Options,
    ],
  ],

  themeConfig: {
    /* Your theme config here */
  } satisfies Preset.ThemeConfig,
};

export default config;
```

:::accordion{title="It is also possible to use JSDoc type annotations within a .js file:"}
[JSDoc type annotations](https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html)

By default, the Docusaurus TypeScript config does not type-check JavaScript files.

The `// @ts-check` comment ensures the config file is properly type-checked when running `npx tsc`.

```js title="docusaurus.config.js" {1,3,13,22}
// @ts-check

/** @type {import('@docusaurus/types').Config} */
const config = {
  tagline: 'Dinosaurs are cool',
  favicon: 'img/favicon.ico',

  /* Your site config here */

  presets: [
    [
      '@docusaurus/preset-classic',
      /** @type {import('@docusaurus/preset-classic').Options} */
      (
        {
          /* Your preset config here */
        }
      ),
    ],
  ],
  themeConfig:
    /** @type {import('@docusaurus/preset-classic').ThemeConfig} */
    (
      {
        /* Your theme config here */
      }
    ),
};

export default config;
```
:::

:::callout{intent="tip"}
Type annotations are very useful and help your IDE understand the type of config objects!

The best IDEs (VS Code, WebStorm, IntelliJ...) will provide a nice auto-completion experience.
:::

## Swizzling TypeScript theme components

For themes that support TypeScript theme components, you can add the `--typescript` flag to the end of the `swizzle` command to get TypeScript source code. For example, the following command will generate `index.tsx` and `styles.module.css` into `src/theme/Footer`.

```bash npm2yarn
npm run swizzle @docusaurus/theme-classic Footer -- --typescript
```

All official Docusaurus themes support TypeScript theme components, including [`theme-classic`](/guides/api-themes-theme-classic), [`theme-live-codeblock`](/guides/api-themes-theme-live-codeblock), and [`theme-search-algolia`](/guides/api-themes-theme-search-algolia). If you are a Docusaurus theme package author who wants to add TypeScript support, see the [Lifecycle APIs docs](/guides/api-plugin-methods-extend-infrastructure#gettypescriptthemepath).

## Related pages

- [Docusaurus](../index.md)
- [Advanced Tutorials](./advanced.md)
- [Docs](../guides.md)
- [Api](./api.md)
- [Blog](./blog.md)
- [Browser support](./browser-support.md)
- [CLI](./cli.md)
- [Docusaurus Client API](./docusaurus-core.md)
- [Configuration](./configuration.md)
- [Deployment](./deployment.md)

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