Recursively freezes an object to make it fully immutable.

deepfreeze.js

function deepFreeze (obj) {
  Object.freeze(obj)
  Object.values(obj).forEach((value) => {
    if (typeof value === 'object') {
      deepFreeze(value)
    }
  })
}

example.js

const user = {
  name: 'john',
  wallet: {
    balance: 100
  }
}

deepFreeze(user)

user.name = 'bob'
user.wallet.balance = 99999

console.log(user)
// {
//   name: 'john',
//   wallet: {
//     balance: 100
//   }
// }