We are changing the names of these files to reduce similarity with CSS modules and avoid clashing with tooling built around that. If you're importing `*/internal/styles.css.js`, swap to `*/internal/styles.js`.
PiperOrigin-RevId: 611265000
In particular, this allows external build tools like Rollup and @web/dev-server to understand imports of Lit, which is configured to require the ".js" extension via its export conditions (so that Lit import maps can remain minimal).
PiperOrigin-RevId: 469772992
