TypeScript Migration Guide Incremental strategy for migrating JavaScript codebases to TypeScript. Designed for legacy projects that need progressive, non-disruptive migration. When to Use This Skill Activate when the user: - Wants to convert a JS project (or parts of it) to TypeScript - Needs to add TypeScript to an existing JavaScript project - Asks about typing legacy code or reducing usage - Wants to improve type safety incrementally - Is setting up tsconfig for a mixed JS/TS codebase Core Principle: Incremental Migration Never rewrite everything at once. Migrate file by file, starting fro…