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Because we don’t have time travel. Go 1.0 was in 2012. Rust 1.0 was in 2015. So unless you were going to choose Java (which Google did and everybody else balked at) it’s hard to justify using any other compiled or non-self-hosted language—especially with Go/Rust on the horizon.

C++ would’ve been a very reasonable choice

not for contribution, performance is not the most important metric. Go is such a huge win for TS because it balances ease of contribution (web people can read, parse, and write Go code) and performance (10x!) Trying to contribute to a rust project...let alone read it! xD is like Effect+++