docs(Transition): Document UrlRouter as internal API

Relates to angular-ui/ui-router#3262 (comment)

src/url/urlRouter.ts

@@ -53,7 +53,8 @@ defaultRuleSortFn = composeSort(
  *
  * ### Deprecation warning:
  * This class is now considered to be an internal API
- * For configuring URL rules, use the [[UrlRulesApi]] which can be found on [[UrlService.rules]].
+ * Use the [[UrlService]] instead.
+ * For configuring URL rules, use the [[UrlRulesApi]] which can be found as [[UrlService.rules]].
  *
  * This class updates the URL when the state changes.
  * It also responds to changes in the URL.

src/vanilla/hashLocation.ts

@@ -1,26 +1,32 @@
 /**
  * @internalapi
  * @module vanilla
- */ /** */
+ */
+/** */
 import { isDefined } from "../common/index";
 import { LocationServices } from "../common/coreservices";
 import { splitHash, splitQuery, trimHashVal, getParams, locationPluginFactory, buildUrl } from "./utils";
 import { UIRouter } from "../router";
-import { LocationPlugin } from "./interface";
+import { LocationPlugin, LocationLike, HistoryLike } from "./interface";
 import { pushTo, deregAll } from "../common/common";
 import { Disposable } from "../interface";
 import { BrowserLocationConfig } from "./browserLocationConfig";
 
 /** A `LocationServices` that uses the browser hash "#" to get/set the current location */
 export class HashLocationService implements LocationServices, Disposable {
   private _listeners: Function[] = [];
+  _location: LocationLike;
+  _history: HistoryLike;
 
-  hash   = () => splitHash(trimHashVal(location.hash))[1];
-  path   = () => splitHash(splitQuery(trimHashVal(location.hash))[0])[0];
-  search = () => getParams(splitQuery(splitHash(trimHashVal(location.hash))[0])[1]);
+  _getHash = () => trimHashVal(this._location.hash);
+  _setHash = (val) => this._location.hash = val;
+
+  hash   = () => splitHash(this._getHash())[1];
+  path   = () => splitHash(splitQuery(this._getHash())[0])[0];
+  search = () => getParams(splitQuery(splitHash(this._getHash())[0])[1]);
 
   url(url?: string, replace: boolean = true): string {
-    if (isDefined(url)) location.hash = url;
+    if (isDefined(url)) this._setHash(url);
     return buildUrl(this);
   }
 

src/vanilla/interface.ts

@@ -15,3 +15,16 @@ export interface ServicesPlugin extends UIRouterPlugin {
   $q: $QLike,
   $injector: $InjectorLike
 }
+
+export interface LocationLike {
+  hash: string;
+  pathname: string;
+  search: string;
+}
+
+export interface HistoryLike {
+  back(distance?: any): void;
+  forward(distance?: any): void;
+  pushState(statedata: any, title?: string, url?: string): void;
+  replaceState(statedata: any, title?: string, url?: string): void;
+}

src/vanilla/pushStateLocation.ts

@@ -5,7 +5,7 @@
 import { isDefined } from "../common/index";
 import { LocationServices, LocationConfig } from "../common/coreservices";
 import { splitQuery, trimHashVal, getParams, locationPluginFactory, buildUrl } from "./utils";
-import { LocationPlugin } from "./interface";
+import { LocationPlugin, HistoryLike, LocationLike } from "./interface";
 import { UIRouter } from "../router";
 import { pushTo, deregAll } from "../common/common";
 import { Disposable } from "../interface";
@@ -18,9 +18,9 @@ import { BrowserLocationConfig } from "./browserLocationConfig";
  */
 export class PushStateLocationService implements LocationServices, Disposable {
   private _listeners: Function[] = [];
-  private _location: Location;
-  private _history: History;
-  private _config: LocationConfig;
+  _location: LocationLike;
+  _history: HistoryLike;
+  _config: LocationConfig;
 
   constructor(router: UIRouter) {
     this._location = location;