tl;dr:Michael discusses his process contributing to Bun - a new JavaScript / TypeScript runtime, elaborating on the following workflow in this article: (1) Setup and run the tests for an existing codebase and get them green. (2) Write a test that fails. (3) Change the code. (4) Think if you need to add another test. (5) If you found a test to write then go back to 1. If you can’t think of a test you’re done.