mastering-typescript

Build enterprise-grade, type-safe applications with TypeScript 5.9+. Compatibility: TypeScript 5.9+, Node.js 22 LTS, Vite 7, NestJS 11, React 19 Use when: Before starting any TypeScript project: Validate type conformance while preserving inference: See react-integration.md and nestjs-integration.md for detailed patterns. See enterprise-patterns.md for comprehensive migration guides. - Building type-safe React, NestJS, or Node.js applications - Migrating JavaScript codebases to TypeScript - Implementing advanced type patterns (generics, mapped types, conditional types) - Configuring modern TypeScript toolchains (Vite, pnpm, ESLint) - Designing type-safe API contracts with Zod validation - Comparing TypeScript approaches with Java or Python - Add allowJs: true and checkJs: false to tsconfig.json - Rename files from .js to .ts one at a time - Add type annotations gradually - Enable stricter options incrementally - type-system.md — Complete type system guide - generics.md — Advanced generics patterns - enterprise-patterns.md — Error handling, validation, architecture - react-integration.md — React + TypeScript patterns - nestjs-integration.md — NestJS API development - toolchain.md — Modern build tools configuration - tsconfig-template.json — Strict enterprise config - eslint-template.js — ESLint 9 flat config - validate-setup.sh — Verify TypeScript environment