There is no way any of this process takes less time to solve than "I got a red squiggle in my editor and fixed the variable spelling". I don't think typos are really the only things type systems fix (type systems provide powerful ways of preventing screw-ups by allowing you to encode invariants about a piece of data and how it may be used), but if typos are indeed the extent of it, it seems unimaginable to me that the process to fix would be faster by going through code review -> CI pipeline -> deploy and then back again, no matter how fast it is to revert a change in production. Honestly that's just the compile-time safety advantage of types, half the time saved in typescript is just not spending time having to read someone else's source code to figure out how a function may be used because cowboy js devs were too lazy to document them (knex is an especially egregious offender in this regard that I thankfully don't have to use anymore).