As I delve into the concept of creating directives in AngularJS, I am faced with the imminent end of Angular 1.x and the rise of Angular 2.x. The shift seems daunting, but I am determined to bridge this gap seamlessly. In my quest for clarity, I stumbled upon a helpful resource at this link. Being a Java and C++ programmer venturing into frontend development, I encounter terms like 'transclude-to' and 'transclude-id' that leave me puzzled. Where do these come from? Despite scouring through various documentation, I am unable to find any mention of them.