metamask-extension/.storybook/preview.js

import React from 'react'
import { addDecorator, addParameters } from '@storybook/react'
import { withKnobs } from '@storybook/addon-knobs'
import { Provider } from 'react-redux'
import configureStore from '../ui/app/store/store'
import '../ui/app/css/index.scss'
import localeList from '../app/_locales/index.json'
import * as allLocales from './locales'
import { I18nProvider, LegacyI18nProvider } from './i18n'

addParameters({
  backgrounds: {
    default: 'light',
    values: [
      { name: 'light', value: '#FFFFFF'},
      { name: 'dark', value: '#333333' },
    ],
  }
})

export const globalTypes = {
  locale: {
    name: 'Locale',
    description: 'internationalization locale',
    defaultValue: 'en',
    toolbar: {
      icon: 'globe',
      items: localeList.map(({ code, name }) => {
        return { value: code, right: code, title: name }
      })
    },
  },
};

const styles = {
  height: '100vh',
  display: 'flex',
  justifyContent: 'center',
  alignItems: 'center',
}

const store = configureStore({
  metamask: { metamask: { } },
})

const metamaskDecorator = (story, context) => {
  const currentLocale = context.globals.locale
  const current = allLocales[currentLocale]
  return (
    <Provider store={store}>
      <I18nProvider
        currentLocale={currentLocale}
        current={current}
        en={allLocales.en}
      >
        <LegacyI18nProvider>
          <div style={styles}>
            { story() }
          </div>
        </LegacyI18nProvider>
      </I18nProvider>
    </Provider>
  )
}

addDecorator(withKnobs)
addDecorator(metamaskDecorator)