react-migration

What problem does it solve?

Migrating large React codebases from untyped JavaScript to TypeScript is error-prone, time-consuming, and risky; this guide reduces migration risk by providing a phased, verifiable approach that balances incremental typing with build and tooling modernization.

Core Features & Use Cases

• Progressive migration framework: assessment, permissive tsconfig setup, file-by-file renames, incremental strictness, and tracking to minimize disruption.
• Legacy pattern replacement & modernization: convert class components to functional components, replace PropTypes with TypeScript types and Zod validation, and migrate CRA→Vite and Jest→Vitest.
• Practical validation and tooling: includes repo scanning checks, suggested tsconfig flags, typecheck scripts, ESLint flat-config guidance, and common pitfalls to avoid.
• Use Case: Plan and execute a migration for a legacy CRA app with many class components, untyped API responses, and mixed JS/JSX files to achieve gradual strict typing and modern tooling.

Quick Start

Request a migration readiness report for this repository and a prioritized plan to convert leaf components, API types, and build tooling to TypeScript.