TypeScript

Use the type system aggressively at compile time and Zod at runtime so invalid states are hard to represent and easy to reject.

When to Activate

• Configure a new TypeScript service
• Add request parsing or input validation
• Replace any in an existing module
• Model variant-heavy state or workflow results
• Choose ESM or CJS for a package
• Introduce path aliases in a growing codebase
• Write or review Vitest suites

Compiler and Validation