build(node): split test and src compilation units

modules/angular2/src/common/directives/ng_switch.ts

@@ -4,7 +4,8 @@ import {ListWrapper, Map} from 'angular2/src/facade/collection';
 
 const _WHEN_DEFAULT = CONST_EXPR(new Object());
 
-class SwitchView {
+/** @internal */
+export class SwitchView {
   constructor(private _viewContainerRef: ViewContainerRef, private _templateRef: TemplateRef) {}
 
   create(): void { this._viewContainerRef.createEmbeddedView(this._templateRef); }