message: chore(devenv): allow type annotation in story code
  This change is for allowing type annotations in our `story.ts` code.
diff: @@ -63,8 +63,8 @@ module.exports = ({ config, mode }) => {
  {
  loader: require.resolve('@storybook/addon-storysource/loader'),
  options: {
  + parser: 'typescript',
  prettierConfig: {
  - parser: 'babylon',
  printWidth: 80,
  tabWidth: 2,
  bracketSpacing: true,
  