The phpstan-drupal playground exists to reproduce bugs. You paste PHP, run PHPStan with phpstan-drupal against a real Drupal core install, and share the result link in an issue.

It never quite worked right, and I never got around to fixing it. The bugs were small, individually boring, and always someone else's turn on my list. What finally cleared them was working through them with an agent, which is also how the rest of this post happened. The workflow still assumed a person in a browser. Now it works for an agent too.

Two things I wanted: