Why Type Safety Matters at Scale
As frontend codebases grow to hundreds of components and complex state machines, runtime type errors become the most costly category of software defects. TypeScript provides a compile-time safety net that accelerates refactoring and documents component contracts.
1. Discriminated Unions for State Handling
Instead of loose booleans like isLoading and isError, model component state as mutually exclusive states:
type AsyncState<T> =
| { status: 'idle' }
| { status: 'loading' }
| { status: 'success'; data: T }
| { status: 'error'; error: Error };2. Generic Component Props
Build reusable table and list components that infer their item types without casting to any.
3. Strict Compiler Flags
Enable strict: true, noImplicitReturns, and noUncheckedIndexedAccess in your tsconfig.json to catch null pointer bugs before deployment.
