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Intersection Types
Prerequisites: Interfaces vs. type aliases
An intersection type (&) combines several types into one that must
satisfy all of them at once — the opposite of a union, which needs
only one.
type Named = { name: string };
type Aged = { age: number };
type Person = Named & Aged; // must have both name AND age
const ada: Person = { name: "Ada", age: 25 };
Useful for composing several smaller, focused shapes into one larger one, instead of repeating shared fields across several interfaces.