It should throw an error if you use a class that doesn't exist

[nickretallack]

If you have something like this:

import style from 'style.module.css';

export default () => <div className={style.foo}/>

If the class foo doesn't exist in style.module.css, style.foo will be undefined, so you'll just end up with a div with no class applied to it.

I would like an automated check for this sort of mistake.

I'm currently using this VSCode plugin which can highlight the problem in the editor, but it doesn't work as a compile-time check. Neither does this typescript plugin.