TypeScript Best Practices

Quick Start

Always enable strict mode and use explicit types for public APIs. Prefer type-only imports (import type) and named exports over default exports. Use discriminated unions for state management and type guards for runtime validation.

Type Safety Fundamentals

Strict Mode Configuration

Enable all strict flags in tsconfig.json:

{
  "strict": true,
  "noImplicitAny": true,
  "noImplicitReturns": true,
  "strictNullChecks": true,
  "strictFunctionTypes": true
}