build: stricter unused variable checking (#6633)

Currently only variables that don't start with an underscore will be checked by TSLint.

This doesn't make sense, because variables get prefixed with an underscore to indicate that they are not part of the public API, but still need to be public in favor of AOT compilation for example. This means that those properties are having the public modifier set (explicitly or automatically) and therefore won't be treated as unused anyway.

**TL;DR**: With this change, prefixed variables will be checked by the `no-unused-variable` TSLint rule and those which are marked as `private` and are unused will be catched by TSLint.

src/cdk/overlay/position/connected-position-strategy.ts

@@ -72,12 +72,12 @@ export class ConnectedPositionStrategy implements PositionStrategy {
   }
 
   constructor(
+      originPos: OriginConnectionPosition,
+      overlayPos: OverlayConnectionPosition,
       private _connectedTo: ElementRef,
-      private _originPos: OriginConnectionPosition,
-      private _overlayPos: OverlayConnectionPosition,
       private _viewportRuler: ViewportRuler) {
     this._origin = this._connectedTo.nativeElement;
-    this.withFallbackPosition(_originPos, _overlayPos);
+    this.withFallbackPosition(originPos, overlayPos);
   }
 
   /** Ordered list of preferred positions, from most to least desirable. */

src/cdk/overlay/position/overlay-position-builder.ts

@@ -36,6 +36,6 @@ export class OverlayPositionBuilder {
       elementRef: ElementRef,
       originPos: OriginConnectionPosition,
       overlayPos: OverlayConnectionPosition): ConnectedPositionStrategy {
-    return new ConnectedPositionStrategy(elementRef, originPos, overlayPos, this._viewportRuler);
+    return new ConnectedPositionStrategy(originPos, overlayPos, elementRef, this._viewportRuler);
   }
 }

src/cdk/rxjs/rx-operators.ts

@@ -76,7 +76,7 @@ export interface StrictRxChain<T> {
   result(): Observable<T>;
 }
 
-
+/* tslint:disable:no-unused-variable */
 export class FinallyBrand { private _; }
 export class CatchBrand { private _; }
 export class DoBrand { private _; }
@@ -89,6 +89,7 @@ export class StartWithBrand { private _; }
 export class DebounceTimeBrand { private _; }
 export class AuditTimeBrand { private _; }
 export class TakeUntilBrand { private _; }
+/* tslint:enable:no-unused-variable */
 
 
 export type finallyOperatorType<T> = typeof _finallyOperator & FinallyBrand;

src/lib/dialog/dialog-container.ts

@@ -13,7 +13,6 @@ import {
   EmbeddedViewRef,
   EventEmitter,
   Inject,
-  NgZone,
   Optional,
   ChangeDetectorRef,
   ViewChild,
@@ -100,7 +99,6 @@ export class MdDialogContainer extends BasePortalHost {
   _isAnimating = false;
 
   constructor(
-    private _ngZone: NgZone,
     private _elementRef: ElementRef,
     private _focusTrapFactory: FocusTrapFactory,
     private _changeDetectorRef: ChangeDetectorRef,

src/lib/dialog/dialog.ts

@@ -96,15 +96,15 @@ export class MdDialog {
   constructor(
       private _overlay: Overlay,
       private _injector: Injector,
+      @Optional() location: Location,
       @Inject(MD_DIALOG_SCROLL_STRATEGY) private _scrollStrategy,
-      @Optional() private _location: Location,
       @Optional() @SkipSelf() private _parentDialog: MdDialog) {
 
     // Close all of the dialogs when the user goes forwards/backwards in history or when the
     // location hash changes. Note that this usually doesn't include clicking on links (unless
     // the user is using the `HashLocationStrategy`).
-    if (!_parentDialog && _location) {
-      _location.subscribe(() => this.closeAll());
+    if (!_parentDialog && location) {
+      location.subscribe(() => this.closeAll());
     }
   }
 

src/lib/expansion/expansion-panel-header.ts

@@ -90,8 +90,8 @@ export class MdExpansionPanelHeader implements OnDestroy {
   private _parentChangeSubscription = Subscription.EMPTY;
 
   constructor(
+    renderer: Renderer2,
     @Host() public panel: MdExpansionPanel,
-    private _renderer: Renderer2,
     private _element: ElementRef,
     private _focusOriginMonitor: FocusOriginMonitor,
     private _changeDetectorRef: ChangeDetectorRef) {
@@ -105,7 +105,7 @@ export class MdExpansionPanelHeader implements OnDestroy {
     )
     .subscribe(() => this._changeDetectorRef.markForCheck());
 
-    _focusOriginMonitor.monitor(_element.nativeElement, _renderer, false);
+    _focusOriginMonitor.monitor(_element.nativeElement, renderer, false);
   }
 
   /** Height of the header while the panel is expanded. */

src/lib/paginator/paginator.spec.ts

@@ -1,7 +1,7 @@
 import {async, ComponentFixture, TestBed, inject} from '@angular/core/testing';
 import {MdPaginatorModule} from './index';
 import {MdPaginator, PageEvent} from './paginator';
-import {Component, ElementRef, ViewChild} from '@angular/core';
+import {Component, ViewChild} from '@angular/core';
 import {MdPaginatorIntl} from './paginator-intl';
 import {NoopAnimationsModule} from '@angular/platform-browser/animations';
 import {dispatchMouseEvent} from '@angular/cdk/testing';
@@ -281,8 +281,6 @@ class MdPaginatorApp {
 
   @ViewChild(MdPaginator) mdPaginator: MdPaginator;
 
-  constructor(private _elementRef: ElementRef) { }
-
   goToLastPage() {
     this.pageIndex = Math.ceil(this.length / this.pageSize);
   }

src/lib/select/select.ts

@@ -428,7 +428,6 @@ export class MdSelect extends _MdSelectMixinBase implements AfterContentInit, On
   constructor(
     private _viewportRuler: ViewportRuler,
     private _changeDetectorRef: ChangeDetectorRef,
-    private _overlay: Overlay,
     private _platform: Platform,
     renderer: Renderer2,
     elementRef: ElementRef,

src/lib/slide-toggle/slide-toggle.ts

@@ -301,12 +301,12 @@ class SlideToggleRenderer {
   /** Whether the thumb is currently being dragged. */
   dragging: boolean = false;
 
-  constructor(private _elementRef: ElementRef, platform: Platform) {
+  constructor(elementRef: ElementRef, platform: Platform) {
     // We only need to interact with these elements when we're on the browser, so only grab
     // the reference in that case.
     if (platform.isBrowser) {
-      this._thumbEl = _elementRef.nativeElement.querySelector('.mat-slide-toggle-thumb-container');
-      this._thumbBarEl = _elementRef.nativeElement.querySelector('.mat-slide-toggle-bar');
+      this._thumbEl = elementRef.nativeElement.querySelector('.mat-slide-toggle-thumb-container');
+      this._thumbBarEl = elementRef.nativeElement.querySelector('.mat-slide-toggle-bar');
     }
   }
 

src/lib/tabs/tab-header.spec.ts

@@ -1,7 +1,7 @@
 import {
   async, ComponentFixture, TestBed, fakeAsync, tick, discardPeriodicTasks
 } from '@angular/core/testing';
-import {Component, ViewChild, ViewContainerRef} from '@angular/core';
+import {Component, ViewChild} from '@angular/core';
 import {CommonModule} from '@angular/common';
 import {By} from '@angular/platform-browser';
 import {ENTER, LEFT_ARROW, RIGHT_ARROW, SPACE} from '@angular/cdk/keycodes';
@@ -328,7 +328,7 @@ class SimpleTabHeaderApp {
 
   @ViewChild(MdTabHeader) mdTabHeader: MdTabHeader;
 
-  constructor(private _viewContainerRef: ViewContainerRef) {
+  constructor() {
     this.tabs[this.disabledTabIndex].disabled = true;
   }
 

src/lib/tooltip/tooltip.ts

@@ -197,12 +197,12 @@ export class MdTooltip implements OnDestroy {
   private _leaveListener: Function;
 
   constructor(
+    renderer: Renderer2,
     private _overlay: Overlay,
     private _elementRef: ElementRef,
     private _scrollDispatcher: ScrollDispatcher,
     private _viewContainerRef: ViewContainerRef,
     private _ngZone: NgZone,
-    private _renderer: Renderer2,
     private _platform: Platform,
     @Inject(MD_TOOLTIP_SCROLL_STRATEGY) private _scrollStrategy,
     @Optional() private _dir: Directionality) {
@@ -211,9 +211,9 @@ export class MdTooltip implements OnDestroy {
     // they can prevent the first tap from firing its click event.
     if (!_platform.IOS) {
       this._enterListener =
-        _renderer.listen(_elementRef.nativeElement, 'mouseenter', () => this.show());
+        renderer.listen(_elementRef.nativeElement, 'mouseenter', () => this.show());
       this._leaveListener =
-        _renderer.listen(_elementRef.nativeElement, 'mouseleave', () => this.hide());
+        renderer.listen(_elementRef.nativeElement, 'mouseleave', () => this.hide());
     }
   }
 

tools/screenshot-test/src/app/viewer/viewer.component.ts

@@ -38,9 +38,9 @@ export class ViewerComponent {
   }
 
   constructor(private _service: FirebaseService,
-              private _route: ActivatedRoute,
-              public snackBar: MdSnackBar) {
-    _route.params.subscribe(p => {
+              public snackBar: MdSnackBar,
+              activatedRoute: ActivatedRoute) {
+    activatedRoute.params.subscribe(p => {
       this._service.prNumber = p['id'];
     });
   }

tslint.json

@@ -29,7 +29,7 @@
     "no-var-keyword": true,
     "member-access": [true, "no-public"],
     "no-debugger": true,
-    "no-unused-variable": [true, {"ignore-pattern": "^_"}],
+    "no-unused-variable": true,
     "one-line": [
       true,
       "check-catch",