on-watch - require `$on` and `$watch` deregistration callbacks to be saved in a variable

Watch and On methods on the scope object should be assigned to a variable, in order to be deleted in a $destroy event handler

Rule based on Angular 1.x

Examples

The following patterns are considered problems;

/*eslint angular/on-watch: 2*/

// invalid
$rootScope.$on('event', function () {
    // ...
}); // error: The "$on" call should be assigned to a variable, in order to be destroyed during the $destroy event

The following patterns are not considered problems;

/*eslint angular/on-watch: 2*/

// valid
$scope.$on('event', function () {
    // ...
});

// valid
var unregister = $rootScope.$on('event', function () {
    // ...
});

Version

This rule was introduced in eslint-plugin-angular 0.1.0

Links

Rule source
Example source

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