Awesome Emacs package of the day: eval-in-repl: https://github.com/kaz-yos/eval-in-repl -- it's a great way of interactively executing code to play with it.
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I'm still not sure whether a language should include a "kitchen sink linter" like Rust's clippy or have a package oriented "thousand flowers bloom" linter like eslint for JS and TS.
Clippy is delightful out of the box but eslint makes it so easy to have project specific lints.
Shower thought: using a tool like cargo-semver, could you build a package registry where the uploader never chooses the version number?
E.g. your last release was 5.2025-09-13 and you've just changed a type, so today's release is 6.2025-11-05.
One nice feature of cargo that I wasn't previously aware of: you don't need to do anything after updating your Cargo.toml.
In npm, you need to remember to `npm i` after changing package.json. It's not declarative and the state can get out of sync.