Set config defaults for a package from its module's configDefaults

spec/app/root-view-spec.coffee

@@ -396,8 +396,9 @@ describe "RootView", ->
 
     beforeEach ->
       packageModule =
-        deactivate: ->
+        configDefaults: foo: { bar: 2, baz: 3 }
         activate: jasmine.createSpy("activate")
+        deactivate: ->
         serialize: -> "it worked"
 
     describe ".activatePackage(name, packageModule)", ->
@@ -414,6 +415,13 @@ describe "RootView", ->
         expect(packageModule.activate).toHaveBeenCalledWith(newRootView, "it worked")
         newRootView.remove()
 
+      it "loads config defaults based on the `configDefaults` key", ->
+        expect(config.get('foo.bar')).toBeUndefined()
+        rootView.activatePackage('package', packageModule)
+        config.set("package.foo.bar", 1)
+        expect(config.get('package.foo.bar')).toBe 1
+        expect(config.get('package.foo.baz')).toBe 3
+
     describe ".deactivatePackage(packageName)", ->
       it "deactivates and removes the package module from the package module map", ->
         rootView.activatePackage('package', packageModule)

src/app/root-view.coffee

@@ -113,6 +113,7 @@ class RootView extends View
       when 'Editor' then Editor.deserialize(viewState, this)
 
   activatePackage: (name, packageModule) ->
+    config.setDefaults(name, packageModule.configDefaults) if packageModule.configDefaults?
     @packageModules[name] = packageModule
     packageModule.activate(this, @packageStates[name])