Creating a custom AMD widget with map as the base

Question

Does anyone have an example of creating a custom map widget using the ESRI map as the base? My first attempt:
define([
    "esri/map",
    "dojo/_base/declare"
  ],
  function (map, declare)
{
  
  //widget declaration
  return declare("my.Map", [map],
  {
    constructor : function ()  {},
    
    postCreate : function ()
    {
      this.inherited(arguments);
      
    }
    
  }
  );
}
);

I ran into the following error: mixin #0 is not a callable constructor.

JamesVillanueva · Answer

That did the trick, thanks.

RRubalcava · Answer

esr/map doesn't actully return an object, not last I checked.
You could try declare('mymap', [esri.Map], { ... });