Ryan Dahl, the guy behind NodeJS, is also behind, and as much as I don't like JavaScript, hats off to him, he seems to be a genius in coming up with solutions to problems:

Deno uses a saved memory snapshot of the processed TypeScript parser&compiler in order to reduce the bootstrap time for processing a TS script to essentially zero. In the end, there's no meaningful performance difference when running a JS or a TS script in Deno.

in vs

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