TypeScript Core Patterns

Modern TypeScript development patterns for type safety, runtime validation, and optimal configuration.

Quick Start

New Project: Use 2025 tsconfig → Enable strict + noUncheckedIndexedAccess → Choose Zod for validation

Existing Project: Enable strict: false initially → Fix any with unknown → Add noUncheckedIndexedAccess

API Development: Zod schemas at boundaries → z.infer<typeof Schema> for types → satisfies for routes

Library Development: Enable declaration: true → Use const type parameters → See advanced-patterns-2025.md

Quick Reference

tsconfig.json 2025 Baseline