Minification detects error on abstract keyword in AngularJS UI-Router definition:

test.js:

app.config(function($stateProvider, $urlRouterProvider) {
    ...
    $stateProvider.state("app", {
		url: "/",
		abstract: true,
		views: {
                        ...
		}
	});
});

[ERROR] invalid property id test.js: abstract: true,

Expected behaviour:
abstract should be treated as property in this context and not as class keyword