Interactively decompiling bytecode to see if a refactoring is safe! Smalltalk guru meditation: https://www.mirandabanda.org/cogblog/2017/02/07/smalltalk-scanning-and-shcontrol-structures/
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It feels like rename is by far the most important refactoring operation. If I had an IDE with only one refactoring, I think I'd want rename.
WebAssembly seems like a totally reasonable bytecode format, but I've not had many opportunities to use it so far.
Has wasm found its 'killer app' yet?
Sometimes programming tools are so good that you miss them when using other languages. I see these mentioned the most frequently:
* IntelliJ (for Java)
* Slime+Emacs (for Common Lisp)
* Pharo (for Smalltalk)
I'm struck that they all have bespoke UIs.