Typescript pick

Typescript keyof

interface Person {
  name: string;
  age: number;
  location: string;
}

type K1 = keyof Person; // "name" | "age" | "location"
type K2 = keyof Person[]; // "length" | "push" | "pop" | "concat" | ...
type K3 = keyof { [x: string]: Person }; // string

Typescript pick

interface Tarea {
  titulo: string;
  descripcion: string;
  completado: boolean;
}

type TareaReducido = Pick<Tarea, "titulo" | "descripcion">;

const tarea: TareaReducido = {
  titulo: "Limpiar Recamara",
  descripcion: "Poner en orden todo lo que existe en la recamara",
};

Source: apuntes.de

Typescript utility types merge interfaces

interface A {
    x: string
}

interface B extends Omit<A, 'x'> {
  x: number
}

Source: stackoverflow.com

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