Understand the Relationship Between TypeScript and JavaScript

Overview

TypeScript is a superset of JavaScript that adds static types.

All valid JavaScript is valid TypeScript, but TypeScript adds type annotations and checking. Understanding this relationship is fundamental to using TypeScript effectively.

When to Use This Skill

• Explaining TypeScript to JavaScript developers
• Migrating a JavaScript codebase
• Confused about what TypeScript adds to JavaScript
• Deciding whether to use TypeScript

The Iron Rule