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> runtime for TypeScript written in Go

This makes it sound like the TypeScript runtime (interpreter or JIT) is written in Go, but the project uses the quickjs JavaScript runtime, which is written in C:

https://github.com/bellard/quickjs

Project appears to be semi-dead, and was early stages when it was alive.

Incidentally, Elsa is already the name of a C++ parser: https://scottmcpeak.com/elkhound/sources/elsa/

Fast and go, choose 1. Go is possibly the slowest compiled major language

Probably the standard Go compiler doesn't provide many optimization? I just checked that the one used by The Computer Language Benchmark Game, and not gccgo.

Perhaps..

do you have source to back it up? go seems fast enough to me.

https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

"Notice which boxes overlap completely. Notice which spread across too large a range of values for confidence."

https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

Elsa – Minimal, fast, secure runtime for TypeScript written in Go