>Isn't that less information about the return type? 

yes
>Why would that be better than View? 

if I have a view `FooView extends View` what would `undelegateEvents` return? 
Sorry I am not a backbone expert, if you feel I am wrong and there is some other reason behind the test failure / or you have an alternate test fix : https://travis-ci.org/borisyankov/DefinitelyTyped/builds/14626523#L149 I am happy to be wrong :wink: