Enable `noUncheckedIndexedAccess`

Enable `noUncheckedIndexedAccess` | BeforeMerge Rules | BeforeMerge

Why this matters

With noUncheckedIndexedAccess, indexing into arrays and records yields T | undefined, forcing you to handle the missing case instead of crashing at runtime.

// Bad (flag off)
const first = list[0];
first.toUpperCase(); // undefined if list is empty
 
// Good (flag on)
const first = list[0]; // string | undefined
if (first) first.toUpperCase();

Why This Matters

Related Rules

Catch this automatically on every PR

Why this matters