Typing doesn't get in the way of prototyping code. On the contrary it's essential. When you're starting out a new project the tendancy to refactor is very high.

Typing doesn't get in the way of prototyping code. On the contrary it's essential. When you're starting out a new project the tendancy to refactor is very high. Everything is changing and in flux as you go from nothing to something. Having static typing makes refactoring quick, easy, and most of all safe. Developing new projects for myself in TypeScript vs JavaScript is exponentially faster.