message: fixed storybook config
diff: @@ -9,4 +9,18 @@ module.exports = {
  '@storybook/addon-knobs',
  '@react-theming/storybook-addon/register'
  ],
  -};
  + webpackFinal: async (webpackConfig) => {
  + /**
  + * CRA doesn't support .mjs files
  + * some of packages are provided as .mjs files (e.g. @polkadot/api)
  + * @see similar issue https://github.com/formatjs/formatjs/issues/1395#issuecomment-518823361
  + */
  + webpackConfig.module.rules.push({
  + test: /\.mjs$/,
  + include: /node_modules/,
  + type: 'javascript/auto'
  + })
  +
  + return webpackConfig
  + }
  +}
  