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Metro Configuration

This page is the configuration reference for both withStorybook wrappers available for Metro projects. For initial setup, see Getting Started (entry-point swapping) or Manual Setup (in-app integration).

const { withStorybook } = require('@storybook/react-native/withStorybook');

This is the recommended wrapper for new projects (v10.4+). It auto-detects Metro vs Re.Pack, performs entry-point swapping when STORYBOOK_ENABLED=true is set, and is a strict no-op otherwise — zero Storybook code in the bundle.

Basic usage​

// metro.config.js
const { getDefaultConfig } = require('expo/metro-config');
const { withStorybook } = require('@storybook/react-native/withStorybook');

const config = getDefaultConfig(__dirname);

module.exports = withStorybook(config);

Configuration is driven by environment variables. See Environment Variables for the full reference.

Options​

The bundler-agnostic wrapper accepts an optional second argument for options that can't be expressed as env vars:

module.exports = withStorybook(config, {
  configPath: './.rnstorybook', // Storybook config directory (default: './.rnstorybook')
  useJs: false, // Generate .js instead of .ts (default: false)
  docTools: true, // Auto arg extraction (default: true)
  websockets: 'auto', // 'auto' detects LAN IP, or { host, port }
  experimental_mcp: false, // Enable MCP endpoint at /mcp (default: false)
});

Environment variables (STORYBOOK_ENABLED, STORYBOOK_WS_HOST, etc.) always take precedence over options passed here.

Metro-specific wrapper​

const { withStorybook } = require('@storybook/react-native/metro/withStorybook');

Use this wrapper for in-app integration or when you need direct control over Metro behavior (e.g. the enabled option). This wrapper does not do entry-point swapping — your app remains the entry point and you control where Storybook renders.

Basic usage​

// metro.config.js
const { getDefaultConfig } = require('expo/metro-config');
const { withStorybook } = require('@storybook/react-native/metro/withStorybook');

const config = getDefaultConfig(__dirname);

module.exports = withStorybook(config, {
  enabled: process.env.STORYBOOK_ENABLED === 'true',
});

Complete options reference​

module.exports = withStorybook(config, {
  enabled: true, // Include Storybook in the bundle (default: true)
  configPath: './.rnstorybook', // Storybook config directory (default: './.rnstorybook')
  useJs: false, // Generate .js instead of .ts (default: false)
  docTools: true, // Auto arg extraction (default: true)
  liteMode: false, // Mock default UI deps (default: false)
  websockets: 'auto', // WebSocket config (default: undefined)
  experimental_mcp: false, // Enable MCP endpoint (default: false)
});

Option details​

enabled​

  • Default: true
  • Controls whether Storybook is included in your app bundle. When false, all @storybook/* and storybook/* imports are replaced with empty modules, and your Storybook config directory imports are stubbed out. If you try to render Storybook when disabled, you'll get a blank screen with a warning.

configPath​

  • Default: './.rnstorybook'
  • Path to your Storybook configuration directory (containing main.ts, preview.tsx, etc.).

useJs​

  • Default: false
  • Generate storybook.requires.js instead of storybook.requires.ts. Useful for projects not using TypeScript.

docTools​

  • Default: true
  • Include utilities for automatic arg extraction. Works with babel-plugin-react-docgen-typescript.

liteMode​

  • Default: false
  • Mocks out the default Storybook UI dependencies (like react-native-reanimated), reducing bundle size. Use when pairing with @storybook/react-native-ui-lite instead of @storybook/react-native-ui.

websockets​

  • Default: undefined (disabled)
  • Configure the WebSocket server for remote control and syncing.
  • 'auto': Detects your LAN IP automatically and injects host/port into the generated storybook.requires file (available from v10.2).
  • { host, port }: Manual configuration. On Android physical devices, use your machine's IP instead of localhost.

experimental_mcp​

  • Default: false
  • Enables an experimental MCP (Model Context Protocol) endpoint at /mcp on the Storybook channel server (available from v10.3). Story selection tools require websockets to be enabled. See MCP Configuration.

How it works​

Both wrappers modify your Metro config in the same way under the hood:

File generation — Automatically generates storybook.requires.ts (or .js) containing story imports, addon registration, preview configuration, and hot module reloading support.

Custom resolver — Enables package exports for Storybook's ESM-based packages, handles platform-specific modules (like uuid), filters out template files that can cause Metro to crash, and rewrites the CSF Next import #.storybook/preview to {configPath}/preview so the same story files work in RN-only and dual RN+RNW setups.

Composition — Both wrappers are composable with other config wrappers. Chain them like withStorybook(withNativeWind(config)). The order may matter depending on the other wrappers.

Production builds​

Bundler-agnostic wrapper: Storybook is automatically excluded when STORYBOOK_ENABLED is not set. Nothing to configure.

Metro-specific wrapper: Set enabled: false to strip all Storybook code:

module.exports = withStorybook(config, {
  enabled: process.env.STORYBOOK_ENABLED === 'true',
});

Troubleshooting​

Stories not found — Verify configPath points to the correct directory, check story patterns in main.ts, and clear the Metro cache: npx react-native start --reset-cache or npx expo start --clear.

WebSocket connection failed — Check if the port is already in use, verify the host matches your setup, and use your machine's IP instead of localhost for physical devices. With the bundler-agnostic wrapper, WebSocket settings are auto-injected; with the Metro-specific wrapper, ensure host/port match between withStorybook options and your getStorybookUI call.

Production bundle includes Storybook — With the bundler-agnostic wrapper, ensure you're not setting STORYBOOK_ENABLED=true in production builds. With the Metro-specific wrapper, set enabled: false.