verdaccio/packages/ui-components/.storybook/preview.js

import Flags from 'country-flag-icons/react/3x2';
import { Provider } from 'react-redux';

import config from '../../plugins/ui-theme/src/i18n/config';
import {
  AppConfigurationProvider,
  StyleBaseline,
  ThemeProvider,
  TranslatorProvider,
  store,
} from '../src/';

const DEFAULT_LANGUAGE = 'en-US';
const listLanguages = [
  { lng: DEFAULT_LANGUAGE, icon: Flags.US, menuKey: 'lng.english' },
  { lng: 'cs-CZ', icon: Flags.CZ, menuKey: 'lng.czech' },
  { lng: 'pt-BR', icon: Flags.BR, menuKey: 'lng.portuguese' },
  { lng: 'es-ES', icon: Flags.ES, menuKey: 'lng.spanish' },
  { lng: 'de-DE', icon: Flags.DE, menuKey: 'lng.german' },
];

export const parameters = {
  actions: { argTypesRegex: '^on[A-Z].*' },
  controls: {
    matchers: {
      color: /(background|color)$/i,
      date: /Date$/,
    },
  },
};

// preview-head file contains the __VERDACCIO_BASENAME_UI_OPTIONS
// required by AppConfigurationProvider
export const withMuiTheme = (Story) => (
  <Provider store={store}>
    <TranslatorProvider loadDayJSLocale={() => {}} i18n={config} listLanguages={listLanguages}>
      <AppConfigurationProvider>
        <ThemeProvider>
          <StyleBaseline />
          <Story />
        </ThemeProvider>
      </AppConfigurationProvider>
    </TranslatorProvider>
  </Provider>
);

if (typeof global.process === 'undefined') {
  const { worker } = require('../msw/browser');
  worker.start();
}

export const decorators = [withMuiTheme];