Understand That Code Generation Is Independent of Types

Overview

TypeScript compilation and type checking are separate processes.

The TypeScript compiler does two things: (1) transpile TypeScript to JavaScript, and (2) check types. These are independent - type errors don't prevent code generation, and types don't exist at runtime.

When to Use This Skill

• Confused why code runs despite type errors
• Trying to check types at runtime
• Using instanceof with interfaces
• Expecting types to affect runtime behavior

The Iron Rule