Use @ts-check and JSDoc to Experiment with TypeScript

Overview

You can add TypeScript type checking to JavaScript files without converting them to TypeScript. Use @ts-check at the top of a JS file and JSDoc annotations to add types. This lets you experiment with TypeScript gradually without committing to the full conversion.

When to Use This Skill

• Experimenting with TypeScript
• Gradually migrating JavaScript
• Adding types to JS files
• Teams learning TypeScript
• Validating JavaScript with types

The Iron Rule

Use @ts-check and JSDoc to add TypeScript checking to JavaScript files without full conversion.

Example