Set object's value type while keeping key autocomplete

type-object-values.ts

/* Types */

type Person = {
  age: number,
  city: string
}

type People = { [name: string]: Person }


/* Method 1 */

/*
 * Autocomplete does not work
 * 
 * According to the annotated type, people's key(=name) is any string
 * Consult comments of https://stackoverflow.com/a/52157355/12817553
 */

const people: People = {
  Adams: { age: 18, city: 'New York City' },
  Baker: { age: 19, city: 'Los Angeles' },
  Clark: { age: 20 }
  // Error: Property 'city' is missing in type '{age: number}' but required in type 'Person'
};


/* Method 2 */

/*
 * Autocomplete does work
 * 
 * people.Adams
 * people.Baker
 * people.Clark
 */

const person = (info: Person): Person => info;

const people = {
  Adams: person({ age: 18, city: 'New York City' }),
  Baker: person({ age: 19, city: 'Los Angeles' }),
  Clark: person({ age: 20 })
  // Error: Property 'city' is missing in type '{age: number}' but required in type 'Person'
};

// eslint-disable-next-line @typescript-eslint/no-unused-vars
const checkPeople: People = people;
// Error: Property 'city' is missing in type '{age: number}' but required in type 'Person'