Comment by Chyzwar

Your tests would catch breaking changes as well. In many typescript codebases (angular4) strict null checks is disabled befits are really minuscule.

I am now doing an angular4 project and I do not feel any safer. If you want to have real static typing use Elm, Reason, BuckleScript.

I do not trust MS. Tooling is already bad on anything other than VS Code. TypeScript development is slowing down from 2017.