Testing & Code Quality

tsconfig Strictness

TypeScript strictness options determine how aggressively the compiler rejects unsafe patterns. strict is the baseline; additional flags catch indexing, optional-property, override, and unchecked access bugs.

strict is the serious-project baseline
noUncheckedIndexedAccess makes indexing honest
exactOptionalPropertyTypes tightens optional semantics
noImplicitOverride protects inheritance
Strictness migration should be planned

Strictness profile

{
  "compilerOptions": {
    "strict": true,
    "noUncheckedIndexedAccess": true,
    "exactOptionalPropertyTypes": true,
    "noImplicitOverride": true,
    "noFallthroughCasesInSwitch": true
  }
}

These options move common runtime mistakes into compiler feedback.

Strictness options
Option	Catches
strict	Core strict checking family
noUncheckedIndexedAccess	Possibly missing indexed values
exactOptionalPropertyTypes	Ambiguous optional vs undefined
noImplicitOverride	Accidental non-overrides
noFallthroughCasesInSwitch	Unintentional switch fallthrough
noImplicitReturns	Missing return paths