JavaScript boy and “lovely thoughtleader” 
he/him 
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Daemon is only really useful if you're working on an application though where you're calling it VERY often and don't care about additional memory usage. Super useful for IDE integration too where you need instant feedback.
Being able to keep long-lived memory cache is useful, especially when you're performing multiple computations on a file. You can store ASTs in memory and then caching it in a bunch of places with weak maps.
Allows you to reuse work a lot more efficiently which is useful for a type checker, bundler, optimizing compiler etc.
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