IMAO the code I'm working on should live inside my head, that's the place where I construct and debug. Even when I'm new on a +100Kloc project, I'd still prefer to read through the code and figure out what's actually going on.
I see so many developers in the JS world spending soo much time and focus on all those tools; types, eslint, debuggers, testing, etc.. it makes me really suspicious about whether they have the actual skill to write a good codebase. I can only be convinced when my code would be buggy and theirs flawless, but I never see that, it's for some reason always the other way around! Just take a look at this project (a random pick) with all those (virtual) safeguards, result: over 3600 issues!!! https://github.com/Microsoft/TypeScript
I mean 3600+ issues, WTF!! And I should be using this tool to prevent issues in my software? Sometimes it feels like this entire industry is broken.