Simple prototype pattern

Widget.js

Widget = new function() {
  function MyThing() {
    var privateInstanceMember = "..."
      , privateInstanceMethod = function(){ ... }

    this.instanceMember = "..."
    this.instanceMethod = function(){ ... }
  }
  
  var privateProtoMember = "..."
    , privateProtoMethod = function(){ ... }
  
  this.protoMember = "..."
  this.protoMethod = function(){ ... }
  
  Widget.prototype = this
  return Widget
}