Day 5/90: Interfaces
90 Day TypeScript Challenge: Zero to Production
Today I wanted interfaces to feel like a real engineering decision, not a syntax demo. The useful shift was making everyday values and objects carry clearer meaning.
The checks that mattered were give each variable and object field one precise meaning, let narrowing or inference remove ambiguity instead of relying on comments, and prefer types that explain the allowed states instead of patching invalid states later.
The failure mode I was actively trying to avoid was using broad types because they feel flexible and then losing the real constraint. That is usually the moment a typed codebase starts looking safe while still carrying fuzzy contracts underneath.
I wanted interfaces to read like a real engineering decision instead of a neat TypeScript demo.
That is the bar I want from the track: code that stays readable when requirements move, not just code that compiles today.
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