100k LoC is where I start getting really concerned about software complexity. But Ovadia's writing a compiler, which is well suited to taking complexity off other projects!
As for my browserdev strategies: I lean heavily on Haskell's typesystem more than I use assertions. Unexpected codepaths get debugging statements.
Haskell's designed specifically to avoid non-determinism!
I have unittests (could have more), which I find valuable to help me build the individual pieces. But end-to-end are the more exciting, where I have webpages I want to test against!
I have clear module boundaries which helps both me, & others reusing my code.
Ovadia advises prioritizing dev velocity, & isn't keen on Haskell's inflexibility. Personally I find Haskell very expressive & it's errors helpful. It has good compiletimes (not great) & memory safety.
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