props.supports.js

There is a `props.supports.css` file in the `src` folder. But there is no `props.supports.js` is there a reason for this?

Could one be created? I thought the css was complied from js across the repo.

Start with src/props.supports.css and inspect how CSS is compiled from JavaScript across the repository. Determine whether a corresponding props.supports.js is expected, then add it only if it matches the repository’s existing source-generation pattern. Done means the reason for the missing file is clear and the generated outputs remain consistent.

Written by the indexing model from the issue text.