Google TypeScript Style Guide

Official Google TypeScript coding standards for consistent, maintainable code.

Golden Rules

1. Use TypeScript strictly — enable strict mode in tsconfig.json
2. Prefer interfaces over type aliases for object shapes
3. Never use any — use unknown when type is truly unknown
4. Use const by default, let when reassignment needed, never var
5. Avoid non-null assertions (!) — handle nullability explicitly
6. Use explicit return types on public functions and methods
7. Prefer readonly for properties that should not change

Quick Reference

Naming Conventions

| Element | Convention | Example |