ElementUI not working with Vue instance in MVC layout page

ElementUI not working with Vue instance in MVC layout page. My layout page contains a Vue instance, but when I try to use ElementUI in the child page (.cshtml file) ElementUI does not function. However, if I add a reference to Vue.js inside my child page, ElementUI works. I'm assuming this is because of the require(...) statement in index.js. Is there a workaround for this? If not, can you please tell me how to alter index.js so it will use my layout's Vue instance?