build: enable TSLint on the packages folder (#18459)

porting PRs #18392 and #18441 to 4.x

packages/core/src/application_init.ts

@@ -45,11 +45,10 @@ export class ApplicationInitStatus {
 
     const asyncInitPromises: Promise<any>[] = [];
 
-    const complete =
-        () => {
-          this._done = true;
-          this.resolve();
-        }
+    const complete = () => {
+      this._done = true;
+      this.resolve();
+    };
 
     if (this.appInits) {
       for (let i = 0; i < this.appInits.length; i++) {

packages/core/src/change_detection/differs/default_iterable_differ.ts

@@ -52,11 +52,9 @@ export class DefaultIterableDiffer<V> implements IterableDiffer<V>, IterableChan
   // Keeps track of records where custom track by is the same, but item identity has changed
   private _identityChangesHead: IterableChangeRecord_<V>|null = null;
   private _identityChangesTail: IterableChangeRecord_<V>|null = null;
-  private _trackByFn: TrackByFunction<V>
+  private _trackByFn: TrackByFunction<V>;
 
-  constructor(trackByFn?: TrackByFunction<V>) {
-    this._trackByFn = trackByFn || trackByIdentity;
-  }
+  constructor(trackByFn?: TrackByFunction<V>) { this._trackByFn = trackByFn || trackByIdentity; }
 
   get collection() { return this._collection; }
 

packages/core/src/view/element.ts

@@ -196,7 +196,7 @@ function renderEventHandlerClosure(view: ViewData, index: number, eventName: str
       // Attention: Don't rethrow, to keep in sync with directive events.
       view.root.errorHandler.handleError(e);
     }
-  }
+  };
 }
 
 

packages/core/src/view/provider.ts

@@ -145,7 +145,7 @@ function eventHandlerClosure(view: ViewData, index: number, eventName: string) {
       // Attention: Don't rethrow, as it would cancel Observable subscriptions!
       view.root.errorHandler.handleError(e);
     }
-  }
+  };
 }
 
 export function checkAndUpdateDirectiveInline(

packages/core/src/view/refs.ts

@@ -466,6 +466,7 @@ export function createNgModuleRef(
 class NgModuleRef_ implements NgModuleData, InternalNgModuleRef<any> {
   private _destroyListeners: (() => void)[] = [];
   private _destroyed: boolean = false;
+  // tslint:disable-next-line
   public _providers: any[];
 
   constructor(