chore: Make field declarations explicit

This used to be valid code:

```
class Foo {
  constructor() {
    this.bar = ‘string’;
  }
}
```

This will now fail since ‘bar’ is not explicitly
defined as a field. We now have to write:

```
class Foo {
  bar:string; // << REQUIRED
  constructor() {
    this.bar = ‘string’;
  }
}
```

modules/di/src/annotations.js

@@ -9,6 +9,7 @@ import {CONST} from "facade/lang";
  *
  */
 export class Inject {
+  token;
   @CONST()
   constructor(token) {
     this.token = token;
@@ -26,6 +27,7 @@ export class Inject {
  *
  */
 export class InjectPromise {
+  token;
   @CONST()
   constructor(token) {
     this.token = token;
@@ -43,6 +45,7 @@ export class InjectPromise {
  *
  */
 export class InjectLazy {
+  token;
   @CONST()
   constructor(token) {
     this.token = token;

modules/di/src/binding.js

@@ -4,9 +4,10 @@ import {reflector} from './reflector';
 import {Key} from './key';
 
 export class Dependency {
-  @FIELD('final key:Key')
-  @FIELD('final asPromise:bool')
-  @FIELD('final lazy:bool')
+  key:Key;
+  asPromise:boolean;
+  lazy:boolean;
+  properties:List;
   constructor(key:Key, asPromise:boolean, lazy:boolean, properties:List) {
     this.key = key;
     this.asPromise = asPromise;
@@ -16,6 +17,11 @@ export class Dependency {
 }
 
 export class Binding {
+  key:Key;
+  factory:Function;
+  dependencies:List;
+  providedAsPromise:boolean;
+
   constructor(key:Key, factory:Function, dependencies:List, providedAsPromise:boolean) {
     this.key = key;
     this.factory = factory;
@@ -29,6 +35,7 @@ export function bind(token):BindingBuilder {
 }
 
 export class BindingBuilder {
+  token;
   constructor(token) {
     this.token = token;
   }

modules/di/src/exceptions.js

@@ -28,6 +28,9 @@ function constructResolvingPath(keys:List) {
 export class KeyMetadataError extends Error {}
 
 export class ProviderError extends Error {
+  keys:List;
+  constructResolvingMessage:Function;
+  message;
   constructor(key:Key, constructResolvingMessage:Function) {
     this.keys = [key];
     this.constructResolvingMessage = constructResolvingMessage;
@@ -82,6 +85,7 @@ export class InstantiationError extends ProviderError {
 }
 
 export class InvalidBindingError extends Error {
+  message:string;
   constructor(binding) {
     this.message = `Invalid binding ${binding}`;
   }
@@ -92,6 +96,7 @@ export class InvalidBindingError extends Error {
 }
 
 export class NoAnnotationError extends Error {
+  message:string;
   constructor(typeOrFunc) {
     this.message = `Cannot resolve all parameters for ${stringify(typeOrFunc)}`;
   }

modules/di/src/injector.js

@@ -10,6 +10,7 @@ import {reflector} from './reflector';
 var _constructing = new Object();
 
 class _Waiting {
+  promise:Promise;
   constructor(promise:Promise) {
     this.promise = promise;
   }
@@ -20,6 +21,12 @@ function _isWaiting(obj):boolean {
 
 
 export class Injector {
+  _bindings:List;
+  _instances:List;
+  _parent:Injector;
+  _defaultBindings:boolean;
+  _asyncStrategy: _AsyncInjectorStrategy;
+  _syncStrategy:_SyncInjectorStrategy;
   constructor(bindings:List, {parent=null, defaultBindings=false}={}) {
     var flatten = _flattenBindings(bindings, MapWrapper.create());
     this._bindings = this._createListOfBindings(flatten);
@@ -116,6 +123,7 @@ export class Injector {
 
 
 class _SyncInjectorStrategy {
+  injector:Injector;
   constructor(injector:Injector) {
     this.injector = injector;
   }
@@ -163,6 +171,7 @@ class _SyncInjectorStrategy {
 
 
 class _AsyncInjectorStrategy {
+  injector:Injector;
   constructor(injector:Injector) {
     this.injector = injector;
   }

modules/di/src/key.js

@@ -3,9 +3,9 @@ import {MapWrapper, Map} from 'facade/collection';
 import {FIELD, int, isPresent} from 'facade/lang';
 
 export class Key {
-  @FIELD('final token')
-  @FIELD('final id:int')
-  @FIELD('metadata:Object')
+  token;
+  id:int;
+  metadata:any;
   constructor(token, id:int) {
     this.token = token;
     this.id = id;
@@ -30,7 +30,7 @@ export class Key {
 }
 
 export class KeyRegistry {
-  @FIELD('final _allKeys:Map')
+  _allKeys:Map;
   constructor() {
     this._allKeys = MapWrapper.create();
   }