In Discourse, mainly there are two big JavaScript sections “discourse” and “admin”. Also you can see few more in discourse/app/assets/javascripts at main · discourse/discourse · GitHub.
In plugins, to differentiate admin & normal user section JavaScript files we use “discourse” and “admin” keywords in between like below
plugins/basic-plugin/assets/javascripts/discourse/initializers/alert.js.es6
plugins/basic-plugin/assets/javascripts/admin/initializers/alert.js.es6
Also it will just work even without identification keywords like you mentioned 