preview.js

import { addDecorator } from '@storybook/react';
import { initializeWorker, mswDecorator } from 'msw-storybook-addon';
import getConfigForCurrentEnv from 'get-env-config';
import { getEnvironment } from 'get-environment';
import { userContextDecorator } from '../__mocks__/auth';

const { storyBook } = getConfigForCurrentEnv();
const env = getEnvironment();

// Only use Mock Service Worker when we are running locally for now
if (env === 'local' || env === 'development') {
  initializeWorker({
    serviceWorker: {
      // Points to the custom location of the Service Worker file.
      url: `${storyBook}mockServiceWorker.js`,
    },
  });
  addDecorator(mswDecorator);
  addDecorator(userContextDecorator);
}