TypeScript Tips I Wish I Knew Earlier

TypeScript is so much more than just types. Here are the patterns I use daily.

1. Use satisfies for type checking without widening

const config = {
  port: 3000,
  host: "localhost",
} satisfies Record<string, string | number>;

2. Discriminated Unions

type Result<T> =
  | { success: true; data: T }
  | { success: false; error: string };

3. Template Literal Types

type Route = `/${string}`;

These patterns will level up your TypeScript game dramatically.