> For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt.

# Rslib types

This section describes some of the type definitions provided by the Rslib.

## RslibInstance

The type of Rslib instance, corresponding to the return value of the [createRslib](/api/javascript-api/core.md#createrslib) method.

```ts twoslash
import type { RslibInstance } from '@rslib/core';

let rslib: RslibInstance;
```

## RslibConfig

The type of Rslib configuration.

```ts twoslash
import type { RslibConfig } from '@rslib/core';

const config: RslibConfig = {
  lib: [
    {
      format: 'esm',
    },
  ],
};
```

You can also import the type definitions of each field in the Rslib config:

```ts twoslash
import type {
  AutoExternal,
  BannerAndFooter,
  Dts,
  Format,
  LibConfig,
  Redirect,
  Shims,
  Syntax,
} from '@rslib/core';
```

## RsbuildPlugin

Defines the structure and behavior of an Rsbuild plugin.

Rsbuild plugins provide a standardized way to extend build functionality through lifecycle hooks and configuration modifications.

```ts twoslash
import type { RsbuildPlugin } from '@rslib/core';

const myPlugin: RsbuildPlugin = {
  name: 'my-plugin',
  setup() {},
};
```

## CreateRslibOptions

The param type of [createRslib](/api/javascript-api/core.md#createrslib) method.

```ts twoslash
import type { CreateRslibOptions } from '@rslib/core';
```

## BuildOptions

The param type of [rslib.build](/api/javascript-api/instance.md#rslibbuild) method.

```ts twoslash
import type { BuildOptions } from '@rslib/core';
```

## StartMFDevServerOptions

The param type of [rslib.startMFDevServer](/api/javascript-api/instance.md#rslibstartmfdevserver) method.

```ts twoslash
import type { StartMFDevServerOptions } from '@rslib/core';
```

## InspectConfigOptions

The param type of [rslib.inspectConfig](/api/javascript-api/instance.md#rslibinspectconfig) method.

```ts twoslash
import type { InspectConfigOptions } from '@rslib/core';
```

## Rspack

Includes all types exported by `@rspack/core`, such as `Rspack.Configuration`.

```ts twoslash
import type { Rspack } from '@rslib/core';

const rspackConfig: Rspack.Configuration = {};
```

## Rsbuild

Includes all types exported by `@rsbuild/core`, such as `Rsbuild.ToolsConfig`.

See [@rsbuild/core - src/index.ts](https://github.com/web-infra-dev/rsbuild/blob/main/packages/core/src/index.ts) for all exported types of Rsbuild.

```ts twoslash
import type { Rsbuild } from '@rslib/core';

const rsbuildConfig: Rsbuild.ToolsConfig = {};
```

## Others

See [@rslib/core - src/index.ts](https://github.com/web-infra-dev/rslib/blob/main/packages/core/src/index.ts) for all exported types.