Expanded vs Flat data

expanded.js

const data = {
  people: [
    {
      id: 0,
      name: 'John',
      bankAccount: { id: 0, balance: 2864 },
      address: { id: 0, number: 83, street: 'Foo St' },
    },
    {
      id: 1,
      name: 'Steve',
      bankAccount: { id: 1, balance: 97831 },
      address: { id: 0, number: 83, street: 'Foo St' },
    },
  ],
}

flat.js

const data = {
  people: [
    { id: 0, name: 'John', bankAccount: 0, address: 1 },
    { id: 1, name: 'Steve', bankAccount: 1, address: 0 },
  ],
  bankAccounts: [
    { id: 0, balance: 2864 },
    { id: 1, balance: 97831 },
  ],
  addresses: [
    { id: 0, number: 83, street: 'Foo St' },
  ],
}