feat(Globals): implement Disposable and delete global transition data

Author: christopherthielen

src/globals.ts

@@ -9,14 +9,15 @@ import {Transition} from "./transition/transition";
 import {Queue} from "./common/queue";
 import {TransitionService} from "./transition/transitionService";
 import {copy} from "./common/common";
+import { Disposable } from './interface';
 
 /**
  * Global router state
  *
  * This is where we hold the global mutable state such as current state, current
  * params, current transition, etc.
  */
-export class UIRouterGlobals {
+export class UIRouterGlobals implements Disposable {
   /**
    * Current parameter values
    *
@@ -49,4 +50,10 @@ export class UIRouterGlobals {
 
   /** @internalapi */
   successfulTransitions = new Queue<Transition>([], 1);
+
+  dispose() {
+    this.transitionHistory.clear();
+    this.successfulTransitions.clear();
+    this.transition = null;
+  }
 }

src/router.ts

@@ -119,9 +119,11 @@ export class UIRouter {
     this.globals.$current = this.stateRegistry.root();
     this.globals.current = this.globals.$current.self;
 
+    this.disposable(this.globals);
+    this.disposable(this.stateService);
+    this.disposable(this.stateRegistry);
     this.disposable(this.transitionService);
     this.disposable(this.urlRouter);
-    this.disposable(this.stateRegistry);
     this.disposable(locationService);
     this.disposable(locationConfig);
   }

src/transition/transitionService.ts

@@ -207,8 +207,6 @@ export class TransitionService implements IHookRegistry, Disposable {
    * @internalapi
    */
   dispose(router: UIRouter) {
-    delete router.globals.transition;
-
     values(this._registeredHooks).forEach((hooksArray: RegisteredHook[]) => hooksArray.forEach(hook => {
       hook._deregistered = true;
       removeFrom(hooksArray, hook);