[jakelazaroff]

> “faster typescript” would also be a valid way to say the typescript compiler found a way to automatically write more performant javascript.

That still wouldn't make sense, in the same way that it wouldn't make sense to say "Python type hints found a way to automatically write more performant Python". With few exceptions, the TypeScript compiler doesn't have any runtime impact at all — it simply removes the type annotations, leaving behind valid JavaScript that already existed as source code. In fact, avoiding runtime impact is an explicit design goal of TypeScript [1].

They've even begun to chip away at the exceptions with the `erasableSyntaxOnly` flag [2], which disables features like enums that do emit code with runtime semantics.

[1] https://github.com/microsoft/TypeScript/wiki/TypeScript-Desi...

[2] https://www.typescriptlang.org/docs/handbook/release-notes/t...

[jessekv]

> Python type hints found a way to automatically write more performant Python

I get your point, but... this is exactly the premise of mypyc ;)