Request prop based on another prop

Hello, I have a component that should receive two props, one that indicates whether this component needs a date and a date that should be passed if and only if the component needs a date. Thus, the component must throw an exception if prop needsDate is passed to true and no date is passed. I thought of the following code:

props: {
  needsDate: {
    type: Boolean,
    default: false
  },
  date: {
    type: String,
    required: this.needsDate
  }
}

The problem is that this form does not generate the expected behavior, when step needsDate = true without passing date the component renders date as undefined instead of throwing an error. Can anyone help me understand why this happens and / or what is the correct way to do it?