如何从键派生Typescript类型的值

type Person = {
  name: string;
  age: number;
};

type PersonProperty = keyof Person; // "name" | "age"

function getProperty(obj: Person, key: PersonProperty) {
  return obj[key];
}

const person: Person = {
  name: "John",
  age: 30,
};

const name = getProperty(person, "name"); // string
const age = getProperty(person, "age"); // number

type Arr = string[];

type ArrElement = Arr[number]; // string

const arr: Arr = ["a", "b", "c"];

const element: ArrElement = arr[0]; // string

type Person = {
  name: string;
  age: number;
};

type PartialPerson = Partial<Person>; // { name?: string; age?: number; }

type Person = {
  name: string;
  age: number;
};

type ReadonlyPerson = Readonly<Person>; // { readonly name: string; readonly age: number; }

type Person = {
  name: string;
  age: number;
  address: string;
};

type NameOnly = Pick<Person, "name">; // { name: string; }

type Keys = "name" | "age";
type Value = string;

type RecordType = Record<Keys, Value>; // { name: string; age: string; }