The compiler was written in TS; it wouldn't make much sense to compile TS to Wasm, only to have that same code run in the same interpreter as the JS code. And

The compiler was written in TS; it wouldn't make much sense to compile TS to Wasm, only to have that same code run in the same interpreter as the JS code. And yes, threading was a big part of it. See also: https://devblogs.microsoft.com/typescript/typescript-native-port/ https://devblogs.microsoft.com/typescript/typescript-native-...