I am struggling to think of something that would be both hyped (therefore, popular, and widely used), and at the same time poorly documented. React has a fantas

I am struggling to think of something that would be both hyped (therefore, popular, and widely used), and at the same time poorly documented. React has a fantastic documentation, but React is hardly bleeding edge anymore. Webpack used to be bad with documentation, but has dramatically improved in the recent couple of years. Vue is said to have documentation that is on par with React’s. Perhaps for RxJS documentation is still a pain point, but other than that... can't really say I have been burnt by documentation.