best practices

Learn how to make TypeScript catch missing switch cases at compile time using the exhaustive switch pattern with the never type.

The non-null assertion operator (!) tells TypeScript to trust you when you say a value isn't null or undefined. But this trust comes at a cost: runtime crashes that TypeScript could have prevented. Learn why this operator undermines type safety and what to use instead.

Codemods are automated code transformation tools that parse and modify your source code programmatically. Learn why they're superior to search-and-replace, how major frameworks use them for upgrades, and how to leverage them in your TypeScript projects.

Const assertions provide immutability but lack semantic meaning. Learn how TypeScript's named tuples and readonly arrays combine to give you both type safety and self-documenting code.

Node.js now has built-in support for loading environment variables from .env files. Learn how to use the native loadEnvFile function and ditch the dotenv dependency for good.