```common lisp
(defsystem "lem-js-mode"
  :depends-on ("lem-core")
  :serial t
  :components ((:file "js-mode")))
```

Add a dependency to js-mode on xml-mode.
user
```common lisp
(defsystem "lem-js-mode"
  :depends-on ("lem-core"
               "lem-xml-mode")
  :serial t
  :components ((:file "js-mode")))
```
assistant