fix(TransitionHook): Transition hooks no longer expose the internal StateObject

BREAKING CHANGE: Transition hooks no longer expose the internal `State` object (now named `StateObject`)

- #### Before:

```js
import { State } from "ui-router-core";
const match = { to: (state: State) => state.data.auth };
transitionsvc.onEnter(match, (trans: Transition, state: State) => {
  // state is the internal State object
  if (state.includes["foo"]) { // internal ui-router API
    return false;
  }
}
```

- #### Now:

```js
import { StateDeclaration } from "ui-router-core";
const match = { to: (state: StateDeclaration) => state.data.auth };
transitionsvc.onEnter(match, (trans: Transition, state: StateDeclaration) => {
  // state === the state object you registered
  // Access internal ui-router API using $$state()
  if (state.$$state().includes["foo"]) {
    return false;
  }
}
```

- #### Motivation:

The `State` object (now named `StateObject`) is an internal API and should not be exposed via any public APIs.
If you depend on the internal APIs, you can still access the internal object by calling `state.$$state()`.

- #### BC Likelihood

How likely is this BC to affect me?

Medium: You will likely be affected you 1) have transition hooks, 2) are using typescript and/or 3) use the internal ui-router State API.

- #### BC Severity

How severe is this BC?

Low: Access to the internal api is still available using `$$state()`.

Author: christopherthielen

src/hooks/onEnterExitRetain.ts

@@ -1,8 +1,8 @@
 /** @module hooks */ /** for typedoc */
 import {TransitionStateHookFn} from "../transition/interface";
-import {StateObject} from "../state/stateObject";
 import {Transition} from "../transition/transition";
 import {TransitionService} from "../transition/transitionService";
+import { StateDeclaration } from '../state/interface';
 
 /**
  * A factory which creates an onEnter, onExit or onRetain transition hook function
@@ -13,7 +13,7 @@ import {TransitionService} from "../transition/transitionService";
  * @hidden
  */
 function makeEnterExitRetainHook(hookName: string): TransitionStateHookFn {
-  return (transition: Transition, state: StateObject) => {
+  return (transition: Transition, state: StateDeclaration) => {
     let hookFn: TransitionStateHookFn = state[hookName];
     return hookFn(transition, state);
   }

src/hooks/resolve.ts

@@ -1,11 +1,12 @@
-/** @module hooks */ /** for typedoc */
-import {noop} from "../common/common";
-import {Transition} from "../transition/transition";
-import {StateObject} from "../state/stateObject";
-import {ResolveContext} from "../resolve/resolveContext";
-import {TransitionStateHookFn, TransitionHookFn} from "../transition/interface";
-import {TransitionService} from "../transition/transitionService";
-import {val} from "../common/hof";
+/** @module hooks */
+/** for typedoc */
+import { noop } from '../common/common';
+import { Transition } from '../transition/transition';
+import { ResolveContext } from '../resolve/resolveContext';
+import { TransitionStateHookFn, TransitionHookFn } from '../transition/interface';
+import { TransitionService } from '../transition/transitionService';
+import { val } from '../common/hof';
+import { StateDeclaration } from '../state/interface';
 
 /**
  * A [[TransitionHookFn]] which resolves all EAGER Resolvables in the To Path
@@ -33,9 +34,9 @@ export const registerEagerResolvePath = (transitionService: TransitionService) =
  *
  * See [[StateDeclaration.resolve]]
  */
-const lazyResolveState: TransitionStateHookFn = (trans: Transition, state: StateObject) =>
+const lazyResolveState: TransitionStateHookFn = (trans: Transition, state: StateDeclaration) =>
     new ResolveContext(trans.treeChanges().to)
-        .subContext(state)
+        .subContext(state.$$state())
         .resolvePath("LAZY", trans)
         .then(noop);
 

src/transition/hookBuilder.ts

@@ -79,7 +79,7 @@ export class HookBuilder {
            traceData: { hookType: hookType.name, context: node }
          }, baseHookOptions);
 
-         let state = hookType.criteriaMatchPath.scope === TransitionHookScope.STATE ? node.state : null;
+         let state = hookType.criteriaMatchPath.scope === TransitionHookScope.STATE ? node.state.self : null;
          let transitionHook = new TransitionHook(transition, state, hook, _options);
          return <HookTuple> { hook, node, transitionHook };
        });

src/transition/interface.ts

@@ -210,7 +210,7 @@ export interface TransitionHookFn {
  * - [[IHookRegistry.onEnter]]
  */
 export interface TransitionStateHookFn {
-  (transition: Transition, state: StateObject) : HookResult
+  (transition: Transition, state: StateDeclaration) : HookResult
 }
 
 /**
@@ -700,8 +700,9 @@ export interface IHookRegistry {
   _registeredHooks: { [key: string]: RegisteredHook[] }
 }
 
-/** A predicate type which takes a [[StateObject]] and returns a boolean */
-export type IStateMatch = Predicate<StateObject>
+/** A predicate type which tests if a [[StateDeclaration]] passes some test. Returns a boolean. */
+export type IStateMatch = Predicate<StateDeclaration>
+
 /**
  * This object is used to configure whether or not a Transition Hook is invoked for a particular transition,
  * based on the Transition's "to state" and "from state".

src/transition/transitionHook.ts

@@ -13,9 +13,9 @@ import { services } from '../common/coreservices';
 import { Rejection } from './rejectFactory';
 import { TargetState } from '../state/targetState';
 import { Transition } from './transition';
-import { StateObject } from '../state/stateObject';
 import { TransitionEventType } from './transitionEventType';
-import { RegisteredHook } from './hookRegistry'; // has or is using
+import { RegisteredHook } from './hookRegistry';
+import { StateDeclaration } from '../state/interface'; // has or is using
 
 let defaultOptions: TransitionHookOptions = {
   current: noop,
@@ -34,7 +34,7 @@ export type ErrorHandler  = (error)              => Promise<any>;
 export class TransitionHook {
   type: TransitionEventType;
   constructor(private transition: Transition,
-              private stateContext: StateObject,
+              private stateContext: StateDeclaration,
               private registeredHook: RegisteredHook,
               private options: TransitionHookOptions) {
     this.options = defaults(options, defaultOptions);