TypeScript

TypeScript-specific guidelines for type safety and code organization.

Quick Reference

Do

• Use import type for type-only imports
• Use { cause } when re-throwing errors
• Let TypeScript infer types when obvious
• Create factory functions with create* prefix
• Prefer factory functions over classes
• Return null from handlers when request doesn't match
• Use a logger instead of console.log
• Validate external data at runtime (fetch, filesystem, env vars, user input) with an existing validation library

Don't