Use Different Variables for Different Types

Overview

Don't reuse variables for different purposes.

In JavaScript, you can assign any value to any variable. But in TypeScript, a variable's type is generally fixed. Using different variables for different concepts improves type safety and code clarity.

When to Use This Skill

• Reusing a variable name for a different purpose
• Variables assigned values of different types
• Union types used just to accommodate reassignment
• Debugging type errors from variable reuse

The Iron Rule