TypeScript Style Guide

Prefer interface over type for object shapes. Use type for unions, intersections, and mapped types. Enable strict mode in every project.

Naming

Use PascalCase for types and interfaces, camelCase for variables and functions, UPPERSNAKECASE for constants. Prefix interfaces with nothing — no I prefix.

Error Handling

Avoid throwing raw strings. Define typed error classes or use a Result<T, E> pattern. Always handle promise rejections.