The Object.hasOwn() method can be used to check if an object contains a property as it's own property. Inherited properties and properties from the object's prototype chain will be ignored. It is a more robust replacement for Object.prototype.hasOwnProperty().

const obj = {
  foo: 'foo',
  bar: undefined,
  baz: null
};

console.log(Object.hasOwn(obj, 'foo')) // true
console.log(Object.hasOwn(obj, 'bar')) // true
console.log(Object.hasOwn(obj, 'baz')) // true
console.log(Object.hasOwn(obj, 'toString')) // false