Clear requirements in modules cache between transpilations

[thymikee]

Updating external variables (e.g. theme colors) has no effect in produced CSS.

// theme.js
export default {
  text: 'black';
}

// App.js
import theme from '../styles/theme';

const navLink = css`
  color: ${theme.text}; 
`;

cc @zamotany

[thymikee]

Worth to note it happens with webpack-dev-server

[zamotany]

I guess it makes sense, since how babel/webpack could know to retranspile file App.js if theme.js has changed. We need to came up with clever way to do it.

[thymikee]

If I change App.js, the situation doesn't change too. If it was, I wouldn't rise an issue

[zamotany]

Ok, I have an idea, I'll spend some time on this tomorrow