&quot;Symbol and definition lookup is another great feature of WebStorm. &quot;<p>Webstorm does a great job here. But unfortunately like any &quot;intelligent&quot; tool, when there is a bug in the system you end up with a very frustrating tool. Right now there is a bug that causes properties defined on objects to be available in the global scope. I filed this bug some time ago, wish it would get some attention:<p><a href="https:&#x2F;&#x2F;youtrack.jetbrains.com&#x2F;issue&#x2F;WEB-19183" rel="nofollow">https:&#x2F;&#x2F;youtrack.jetbrains.com&#x2F;issue&#x2F;WEB-19183</a>