Being able to choose your target browsers in Babel is a little like -march in a native code compiler!
Browser targeting has the nice property that you can collect popularity metrics to make quantitative decisions too.
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I like that most LLM UIs show your previous queries prominently.
When figuring out where LLMs are useful in your workflow, it's nice to see what worked well (or not) in the past.
Web search doesn't have this property. I rarely look at what I've previously googled.
I've added an eval button to the website of my programming language!
It's a been a lot of work to lock down appropriately. It still needs some UI polish but it's so nice to be able to try snippets immediately.
https://www.garden-lang.org/
Over a sufficiently long time horizon, all code you write is legacy code.