Convert Module by Module Up Your Dependency Graph

Overview

When migrating JavaScript to TypeScript, follow the dependency graph: start with leaf modules (those with no dependencies) and work upward. This ensures that when you convert a module, all its dependencies are already typed. This minimizes type errors and makes migration manageable.

When to Use This Skill

• Migrating large codebases to TypeScript
• Converting JavaScript to TypeScript
• Managing dependencies during migration
• Planning migration order
• Teams adopting TypeScript

The Iron Rule

Migrate modules starting from leaves (no dependencies) and work up the dependency graph. This ensures dependencies are typed before dependents.

Migration Order