Babel is a requirement

[bodograumann]

For testing purposes I have created a minimal vue-cli v3 project (i.e. without babel). Running vue add storybook and trying to npm run storybook:serve gives me the following error:

ModuleBuildError: Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module '@babel/core'
 babel-loader@8 requires Babel 7.x (the package '@babel/core'). If you'd like to use Babel 6.x ('babel-core'), you should install 'babel-loader@7'.