[ghego1]

IMHO TypeScript saves a lot of time as soon as any project grows over few thousands lines of code. I'm working on a large project in which both backend and frontend are in JavaScript (node+PWA) and without TS it would have been close to impossible to proceed at the speed we did. Thanks to TS we easily know what types must be passed between client and server, and we can easily refactor or edit code without worrying that some mis-type somewhere will brake things. We don't use any anywhere (literally), it's not trivial, but as soon as you get to know TS well enough it's absolutely feasible, at least since TS 3.x.