@storybook/react-native

What is @storybook/react-native?

@storybook/react-native is a tool for developing and testing React Native components in isolation. It allows developers to create and showcase UI components in a structured and interactive manner, making it easier to build and maintain a consistent design system.

What are @storybook/react-native's main functionalities?

Component Story Creation

Allows developers to create stories for different states of a component, making it easier to visualize and test various scenarios.

import { storiesOf } from '@storybook/react-native';
import React from 'react';
import { Button } from 'react-native';

storiesOf('Button', module)
  .add('default', () => (
    <Button title="Default Button" onPress={() => {}} />
  ))
  .add('disabled', () => (
    <Button title="Disabled Button" onPress={() => {}} disabled />
  ));

Addons Integration

Supports various addons like knobs, actions, and links to enhance the functionality of stories, providing more interactive and dynamic component testing.

import { addDecorator } from '@storybook/react-native';
import { withKnobs } from '@storybook/addon-knobs';

addDecorator(withKnobs);

Live Component Preview

Enables live preview of components on a device or emulator, allowing developers to see changes in real-time as they modify their components.

import { getStorybookUI } from '@storybook/react-native';
import { AppRegistry } from 'react-native';
import { name as appName } from './app.json';

const StorybookUIRoot = getStorybookUI({
  asyncStorage: null,
});

AppRegistry.registerComponent(appName, () => StorybookUIRoot);

Other packages similar to @storybook/react-native

react-native-storybook-loader

A utility to automatically load stories for React Native Storybook. It simplifies the process of importing and organizing stories, but it does not provide the full suite of features that @storybook/react-native offers, such as addons and live previews.

react-native-snap-carousel

While not a direct competitor, this package allows for the creation of carousels in React Native. It can be used in conjunction with @storybook/react-native to showcase carousel components, but it does not offer the same level of component isolation and testing capabilities.

react-native-testing-library

A library for testing React Native components. It focuses on providing utilities to test components in a way that resembles how they are used by end-users. While it complements @storybook/react-native by providing testing capabilities, it does not offer the interactive component development environment that Storybook provides.

README

Storybook for React Native

[!IMPORTANT]
This readme is for v8, for v7 docs see the v7.6 docs.

With Storybook for React Native you can design and develop individual React Native components without running your app.

If you are migrating from 7.6 to 8.3 you can find the migration guide here

For more information about storybook visit: storybook.js.org

[!NOTE]
@storybook/react-native requires atleast 8.3.1, if you install other storybook core packages they should be ^8.3.1 or newer.

Table of contents

• 🚀 Getting Started
• 📒 Writing stories
• 🔌 Addons
• 📱 Hide/Show Storybook
• ⚙️ withStorybook wrapper
• 🔧 getStorybookUI
• 🧪 Using stories in unit tests
• 🤝 Contributing
• ✨ Examples

Getting Started

New project

There is some project boilerplate with @storybook/react-native and @storybook/addon-react-native-web both already configured with a simple example.

For expo you can use this template with the following command

# With NPM
npx create-expo-app --template expo-template-storybook AwesomeStorybook

For react native cli you can use this template

npx react-native init MyApp --template react-native-template-storybook

Existing project

Run init to setup your project with all the dependencies and configuration files:

npx storybook@latest init

The only thing left to do is return Storybook's UI in your app entry point (such as App.tsx) like this:

export { default } from './.storybook';

Then wrap your metro config with the withStorybook function as seen below

If you want to be able to swap easily between storybook and your app, have a look at this blog post

If you want to add everything yourself check out the the manual guide here.

Additional steps: Update your metro config

We require the unstable_allowRequireContext transformer option to enable dynamic story imports based on the stories glob in main.ts. We can also call the storybook generate function from the metro config to automatically generate the storybook.requires.ts file when metro runs.

Expo

First create metro config file if you don't have it yet.

npx expo customize metro.config.js

Then wrap your config in the withStorybook function as seen below.

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

/** @type {import('expo/metro-config').MetroConfig} */
const config = getDefaultConfig(__dirname);

module.exports = withStorybook(config, {
  // Set to false to remove storybook specific options
  // you can also use a env variable to set this
  enabled: true,
  // Path to your storybook config
  configPath: path.resolve(__dirname, './.storybook'),

  // Optional websockets configuration
  // Starts a websocket server on the specified port and host on metro start
  // websockets: {
  //   port: 7007,
  //   host: 'localhost',
  // },
});

React native

const { getDefaultConfig, mergeConfig } = require('@react-native/metro-config');
const path = require('path');
const withStorybook = require('@storybook/react-native/metro/withStorybook');
const defaultConfig = getDefaultConfig(__dirname);

/**
 * Metro configuration
 * https://reactnative.dev/docs/metro
 *
 * @type {import('metro-config').MetroConfig}
 */
const config = {};
// set your own config here 👆

const finalConfig = mergeConfig(defaultConfig, config);

module.exports = withStorybook(finalConfig, {
  // Set to false to remove storybook specific options
  // you can also use a env variable to set this
  enabled: true,
  // Path to your storybook config
  configPath: path.resolve(__dirname, './.storybook'),

  // Optional websockets configuration
  // Starts a websocket server on the specified port and host on metro start
  // websockets: {
  //   port: 7007,
  //   host: 'localhost',
  // },
});

Writing stories

In storybook we use a syntax called CSF that looks like this:

import type { Meta, StoryObj } from '@storybook/react';
import { MyButton } from './Button';

const meta = {
  component: MyButton,
} satisfies Meta<typeof MyButton>;

export default meta;

type Story = StoryObj<typeof meta>;

export const Basic: Story = {
  args: {
    text: 'Hello World',
    color: 'purple',
  },
};

You should configure the path to your story files in the main.ts config file from the .storybook folder.

// .storybook/main.ts
import { StorybookConfig } from '@storybook/react-native';

const main: StorybookConfig = {
  stories: ['../components/**/*.stories.?(ts|tsx|js|jsx)'],
  addons: [],
};

export default main;

Decorators and Parameters

For stories you can add decorators and parameters on the default export or on a specifc story.

import type { Meta } from '@storybook/react';
import { Button } from './Button';

const meta = {
  title: 'Button',
  component: Button,
  decorators: [
    (Story) => (
      <View style={{ alignItems: 'center', justifyContent: 'center', flex: 1 }}>
        <Story />
      </View>
    ),
  ],
  parameters: {
    backgrounds: {
      values: [
        { name: 'red', value: '#f00' },
        { name: 'green', value: '#0f0' },
        { name: 'blue', value: '#00f' },
      ],
    },
  },
} satisfies Meta<typeof Button>;

export default meta;

For global decorators and parameters, you can add them to preview.tsx inside your .storybook folder.

// .storybook/preview.tsx
import type { Preview } from '@storybook/react';
import { withBackgrounds } from '@storybook/addon-ondevice-backgrounds';

const preview: Preview = {
  decorators: [
    withBackgrounds,
    (Story) => (
      <View style={{ flex: 1, color: 'blue' }}>
        <Story />
      </View>
    ),
  ],
  parameters: {
    backgrounds: {
      default: 'plain',
      values: [
        { name: 'plain', value: 'white' },
        { name: 'warm', value: 'hotpink' },
        { name: 'cool', value: 'deepskyblue' },
      ],
    },
  },
};

export default preview;

Addons

The cli will install some basic addons for you such as controls and actions. Ondevice addons are addons that can render with the device ui that you see on the phone.

Currently the addons available are:

• @storybook/addon-ondevice-controls: adjust your components props in realtime
• @storybook/addon-ondevice-actions: mock onPress calls with actions that will log information in the actions tab
• @storybook/addon-ondevice-notes: Add some markdown to your stories to help document their usage
• @storybook/addon-ondevice-backgrounds: change the background of storybook to compare the look of your component against different backgrounds

Install each one you want to use and add them to the main.ts addons list as follows:

// .storybook/main.ts
import { StorybookConfig } from '@storybook/react-native';

const main: StorybookConfig = {
  // ... rest of config
  addons: [
    '@storybook/addon-ondevice-notes',
    '@storybook/addon-ondevice-controls',
    '@storybook/addon-ondevice-backgrounds',
    '@storybook/addon-ondevice-actions',
  ],
};

export default main;

Using the addons in your story

For details of each ondevice addon you can see the readme:

• actions
• backgrounds
• controls
• notes

Hide/Show storybook

Storybook on react native is a normal React Native component that can be used or hidden anywhere in your RN application based on your own logic.

You can also create a separate app just for storybook that also works as a package for your visual components. Some have opted to toggle the storybook component by using a custom option in the react native developer menu.

• Heres an approach for react native cli
• Heres an article about how you can do it in expo

withStorybook wrapper

withStorybook is a wrapper function to extend your Metro config for Storybook. It accepts your existing Metro config and an object of options for how Storybook should be started and configured.

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

const defaultConfig = getDefaultConfig(__dirname);

module.exports = withStorybook(defaultConfig, {
  enabled: true,
  // See API section below for available options
});

Options

enabled

Type: boolean, default: true

Determines whether the options specified are applied to the Metro config. This can be useful for project setups that use Metro both with and without Storybook and need to conditionally apply the options. In this example, it is made conditional using an environment variable:

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

const defaultConfig = getDefaultConfig(__dirname);

module.exports = withStorybook(defaultConfig, {
  enabled: process.env.WITH_STORYBOOK,
  // ... other options
});

onDisabledRemoveStorybook

Type: boolean, default: false

If onDisabledRemoveStorybook true and enabled is false, the storybook package will be removed from the build. This is useful if you want to remove storybook from your production build.

useJs

Type: boolean, default: false

Generates the .storybook/storybook.requires file in JavaScript instead of TypeScript.

configPath

Type: string, default: path.resolve(process.cwd(), './.storybook')

The location of your Storybook configuration directory, which includes main.ts and other project-related files.

websockets

Type: { host: string?, port: number? }, default: undefined

If specified, create a WebSocket server on startup. This allows you to sync up multiple devices to show the same story and arg values connected to the story in the UI.

websockets.host

Type: string, default: 'localhost'

The host on which to run the WebSocket, if specified.

websockets.port

Type: number, default: 7007

The port on which to run the WebSocket, if specified.

getStorybookUI options

You can pass these parameters to getStorybookUI call in your storybook entry point:

{
    initialSelection?: string | Object (undefined)
        -- initialize storybook with a specific story.  eg: `mybutton--largebutton` or `{ kind: 'MyButton', name: 'LargeButton' }`
    storage?: Object (undefined)
        -- {getItem: (key: string) => Promise<string | null>;setItem: (key: string, value: string) => Promise<void>;}
        -- Custom storage to be used instead of AsyncStorage
    shouldPersistSelection: Boolean (true)
        -- Stores last selected story in your devices storage.
    onDeviceUI?: boolean;
        -- show the ondevice ui
    enableWebsockets?: boolean;
        -- enable websockets for the storybook ui
    query?: string;
        -- query params for the websocket connection
    host?: string;
        -- host for the websocket connection
    port?: number;
        -- port for the websocket connection
    secured?: boolean;
        -- use secured websockets
    shouldPersistSelection?: boolean;
        -- store the last selected story in the device's storage
    theme: Partial<Theme>;
        -- theme for the storybook ui
}

Using stories in unit tests

Storybook provides testing utilities that allow you to reuse your stories in external test environments, such as Jest. This way you can write unit tests easier and reuse the setup which is already done in Storybook, but in your unit tests. You can find more information about it in the portable stories section.

Contributing

We welcome contributions to Storybook!

• 📥 Pull requests and 🌟 Stars are always welcome.
• Read our contributing guide to get started, or find us on Discord and look for the react-native channel.

Looking for a first issue to tackle?

• We tag issues with Good First Issue when we think they are well suited for people who are new to the codebase or OSS in general.
• Talk to us, we'll find something to suits your skills and learning interest.

Examples

Here are some example projects to help you get started

• A mono repo setup by @axeldelafosse https://github.com/axeldelafosse/storybook-rnw-monorepo
• Expo setup https://github.com/dannyhw/expo-storybook-starter
• React native cli setup https://github.com/dannyhw/react-native-storybook-starter
• Adding a separate entry point and dev menu item in native files for RN CLI project: https://github.com/zubko/react-native-storybook-with-dev-menu
• Want to showcase your own project? open a PR and add it to the list!