JavaScript - definition hash-tables

We use in our JS-based project hash tables, and can't get autocomplete, find usages etc. Example code: upsers

var Class1 = function()
{
  this.Method1 = function(a, b){}
}

var c = new Class1();
c.Method1(); // <- Wotk fine !

var hash = {};
hash['some_key'] = c;
hash['some_key'].Me... //<- Nothing

hash['another_key'] = new Class1();
hash['another_key'].Me... //<- Nothing again


Possible (with using some special syntax or JSDoc comments) fix my code for work autocomplete etc ?