code: @JsOverlay
    public final void addJavaPropDefaultValue(Function javaMethod, String propertyName) {
      PropOptions propDefinition = getProps().get(propertyName);
      propDefinition.defaultValue = javaMethod;
    }
docs: Add a custom prop validator to validate a property
  
  @param javaMethod Function pointer to the method in the {@link IsVueComponent}
  @param propertyName The name of the property to validate