React: What is React prop-types alternative?

TypeScript — compile-time type checking.

1interface UserProps {
2  name: string;
3  age: number;
4  email?: string;
5  onUpdate: (user: User) => void;
6}
7
8function User({ name, age, email, onUpdate }: UserProps) {
9  return <div>{name}, {age}</div>;
10}

vs prop-types: TypeScript is compile-time, faster, richer types. prop-types is runtime, adds bundle size.

Benefits: Catch errors at build time, better IDE support, no runtime overhead, interface documentation.

Migration: Gradual — add TypeScript file by file.