JS database

database.js

function Database(...cols) {
  const arrayEquals = (a1,a2)=>a1.every(e=>a2.includes(e))&&a2.every(e=>a1.includes(e));
  var databaseRaw = [];
  var database = new Proxy(databaseRaw,{
    set(obj, prop, val) {
      if (!(Number.isInteger(Number(prop)) && Number(prop) > 0)) {
        return Reflect.set(obj, prop, val);
      }
      if (typeof val !== 'object') {
        throw new TypeError('Database entry must be an object.');
      }
      if (!arrayEquals(Object.keys(val),database.cols)) {
        throw new TypeError('Database entry must have keys that match the database\'s columns.');
      }
      return Reflect.set(obj, prop, val);
    }
  });
  Object.defineProperty(database,'raw',{
    configurable: false,
    enumerable: false,
    writable: false,
    value: databaseRaw
  });
  Object.defineProperty(database,'cols',{
    configurable: false,
    enumerable: false,
    writable: false,
    value: Object.freeze(cols)
  });
  return database;
}