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Plugins Reference

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Starlight plugins can customize Starlight configuration, UI, and behavior, while also being easy to share and reuse. This reference page documents the API that plugins have access to.

Lean more about using a Starlight plugin in the Configuration Reference.

Quick API Reference

interface StarlightPlugin {
name: string;
hooks: {
setup: (options: {
config: StarlightUserConfig;
updateConfig: (newConfig: StarlightUserConfig) => void;
addIntegration: (integration: AstroIntegration) => void;
astroConfig: AstroConfig;
command: 'dev' | 'build' | 'preview';
isRestart: boolean;
logger: AstroIntegrationLogger;
}) => void | Promise<void>;
};
}

name

type: string

A plugin must provide a unique name that describes it. The name is used when logging messages related to this plugin and may be used by other plugins to detect the presence of this plugin.

hooks

Hooks are functions which Starlight calls to run plugin code at specific times. Currently, Starlight supports a single setup hook.

hooks.setup

Plugin setup function called when Starlight is initialized (during the astro:config:setup integration hook). The setup hook can be used to update the Starlight configuration or add Astro integrations.

This hook is called with the following options:

config

type: StarlightUserConfig

A read-only copy of the user-supplied Starlight configuration. This configuration may have been updated by other plugins configured before the current one.

updateConfig

type: (newConfig: StarlightUserConfig) => void

A callback function to update the user-supplied Starlight configuration. You only need to provide the root-level configuration keys that you want to update but no deep merge is performed. In order to update nested configuration values, you must provide the entire nested object.

For example, to add a new social media account to the configuration without overriding the existing ones:

plugin.ts
export default {
name: 'add-twitter-plugin',
hooks: {
setup({ config, updateConfig }) {
updateConfig({
social: {
...config.social,
twitter: 'astrodotbuild',
},
});
},
},
};

addIntegration

type: (integration: AstroIntegration) => void

A callback function to add an Astro integration required by the plugin. For example, to add the React Astro integration:

plugin.ts
import react from '@astrojs/react';
export default {
name: 'plugin-using-react',
hooks: {
plugin({ addIntegration, astroConfig }) {
const isReactLoaded = astroConfig.integrations.find(
({ name }) => name === '@astrojs/react'
);
// Only add the React integration if it's not already loaded.
if (!isReactLoaded) {
addIntegration(react());
}
},
},
};

astroConfig

type: AstroConfig

A read-only copy of the user-supplied Astro configuration. This configuration is resolved before any other integrations have run.

command

type: 'dev' | 'build' | 'preview'

The command used to run Starlight:

  • dev - Project is executed with astro dev
  • build - Project is executed with astro build
  • preview - Project is executed with astro preview

isRestart

type: boolean

false when the dev server starts, true when a reload is triggered. Common reasons for a restart include a user editing their astro.config.mjs while the dev server is running.

logger

type: AstroIntegrationLogger

An instance of the Astro integration logger that you can use to write logs. All logged messages will be prefixed with the plugin name.

plugin.ts
export default {
name: 'long-process-plugin',
hooks: {
plugin({ logger }) {
logger.info('Starting long process…');
// Some long process…
},
},
};

The example above will log a message that includes the provided info message:

Terminal window
[long-process-plugin] Starting long process…