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# use-services
Requires the use of `Services` rather than `Cc[].getService()` where a
service is already defined in `Services`.
## Examples of incorrect code for this rule
```js
Cc["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);
Components.classes["@mozilla.org/toolkit/app-startup;1"].getService(Components.interfaces.nsIAppStartup);
```
## Examples of correct code for this rule
```js
Services.wm.addListener()
Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator)
```