TypeScript array sortOn key

sortOn.ts

function sortOn<T>(array: T[], ...fields: (keyof T)[]) {
  return array.sort((a, b) => {
    for (const f of fields) {
      if (a[f] > b[f]) return 1;
      if (a[f] < b[f]) return -1;
    }
    return 0;
  });
}

// Example
const people = [{ name: "Jon" }, { name: "Bob" }, /*...*/];
sortOn(people, "name");

const people = [{ firstName: "Jon", lastName: "Doe" }, { firstName: "Jon", lastName: "Bo" }, /*...*/];
sortOn(people, "firstName", "lastName");