Development
TypeScript Practices That Prevent Production Bugs
The handful of TypeScript habits that catch real bugs before they ship, and the ones that just add noise.
By Priya SharmaMay 2, 20267 min read
TypeScript only pays off if you let it. Half-typed codebases get the cost of types with little of the benefit. A few habits separate the two.
Turn on strict, and mean it
Strict mode plus noUncheckedIndexedAccess catches the null and undefined bugs that dominate production incidents. Turn it on at the start; retrofitting later is painful.
Type the boundaries
Validate and type data where it enters your system, API responses, form input, env vars, with a runtime validator. Inside that boundary, trust your types.
Model states, don't just shape data
Discriminated unions make impossible states unrepresentable. A request that's "loading" can't also have data; encode that and whole classes of bugs disappear.
