diff --git a/guides/bidirectionality.md b/guides/bidirectionality.md
index a0f711826ed3..b1d955b54730 100644
--- a/guides/bidirectionality.md
+++ b/guides/bidirectionality.md
@@ -31,7 +31,7 @@ export class MyCustomComponent {
     this.dir = directionality.value;
 
     directionality.change.subscribe(() => {
-       this.dir = directionality.value;
+      this.dir = directionality.value;
     });
   }
 }
diff --git a/src/cdk-experimental/dialog/dialog-container.ts b/src/cdk-experimental/dialog/dialog-container.ts
index a1182acfdf4e..1d3fd9247cc9 100644
--- a/src/cdk-experimental/dialog/dialog-container.ts
+++ b/src/cdk-experimental/dialog/dialog-container.ts
@@ -104,19 +104,19 @@ export class CdkDialogContainer extends BasePortalOutlet implements OnDestroy {
   @ViewChild(CdkPortalOutlet, {static: true}) _portalHost: CdkPortalOutlet;
 
   /** A subject emitting before the dialog enters the view. */
-  _beforeEnter: Subject<void> = new Subject();
+  readonly _beforeEnter = new Subject<void>();
 
   /** A subject emitting after the dialog enters the view. */
-  _afterEnter: Subject<void> = new Subject();
+  readonly _afterEnter = new Subject<void>();
 
   /** A subject emitting before the dialog exits the view. */
-  _beforeExit: Subject<void> = new Subject();
+  readonly _beforeExit = new Subject<void>();
 
   /** A subject emitting after the dialog exits the view. */
-  _afterExit: Subject<void> = new Subject();
+  readonly _afterExit = new Subject<void>();
 
   /** Stream of animation `done` events. */
-  _animationDone = new Subject<AnimationEvent>();
+  readonly _animationDone = new Subject<AnimationEvent>();
 
   constructor(
     private _elementRef: ElementRef<HTMLElement>,
diff --git a/src/cdk-experimental/dialog/dialog.ts b/src/cdk-experimental/dialog/dialog.ts
index 63bd6bb52d09..3e01749e200a 100644
--- a/src/cdk-experimental/dialog/dialog.ts
+++ b/src/cdk-experimental/dialog/dialog.ts
@@ -54,7 +54,7 @@ export class Dialog implements OnDestroy {
   _getAfterAllClosed(): Observable<void> {
     return this._parentDialog ? this._parentDialog.afterAllClosed : this._afterAllClosedBase;
   }
-  _afterAllClosedBase = new Subject<void>();
+  readonly _afterAllClosedBase = new Subject<void>();
 
   // TODO(jelbourn): tighten the type on the right-hand side of this expression.
   afterAllClosed: Observable<void> = defer(() => this.openDialogs.length ?
@@ -64,7 +64,7 @@ export class Dialog implements OnDestroy {
   get afterOpened(): Subject<DialogRef<any>> {
     return this._parentDialog ? this._parentDialog.afterOpened : this._afterOpened;
   }
-  _afterOpened: Subject<DialogRef<any>> = new Subject();
+  readonly _afterOpened = new Subject<DialogRef<any>>();
 
   /** Stream that emits when a dialog is opened. */
   get openDialogs(): DialogRef<any>[] {
diff --git a/src/cdk-experimental/listbox/listbox.ts b/src/cdk-experimental/listbox/listbox.ts
index 9228d5b6c9d3..aab60456e99c 100644
--- a/src/cdk-experimental/listbox/listbox.ts
+++ b/src/cdk-experimental/listbox/listbox.ts
@@ -93,7 +93,7 @@ export class CdkOption<T = unknown> implements ListKeyManagerOption, Highlightab
     this._value = value;
   }
 
-  @Output() readonly selectionChange: EventEmitter<OptionSelectionChangeEvent<T>> =
+  @Output() readonly selectionChange =
       new EventEmitter<OptionSelectionChangeEvent<T>>();
 
   constructor(private readonly _elementRef: ElementRef,
@@ -243,7 +243,7 @@ export class CdkListbox<T> implements AfterContentInit, OnDestroy, OnInit, Contr
 
   @ContentChildren(CdkOption, {descendants: true}) _options: QueryList<CdkOption<T>>;
 
-  @Output() readonly selectionChange: EventEmitter<ListboxSelectionChangeEvent<T>> =
+  @Output() readonly selectionChange =
       new EventEmitter<ListboxSelectionChangeEvent<T>>();
 
   @Input() id = `cdk-listbox-${listboxId++}`;
diff --git a/src/cdk-experimental/menu/context-menu.ts b/src/cdk-experimental/menu/context-menu.ts
index 9c60a5618c27..461b664ab93d 100644
--- a/src/cdk-experimental/menu/context-menu.ts
+++ b/src/cdk-experimental/menu/context-menu.ts
@@ -129,7 +129,7 @@ export class CdkContextMenuTrigger implements OnDestroy {
   private _panelContent: TemplatePortal;
 
   /** Emits when the element is destroyed. */
-  private readonly _destroyed: Subject<void> = new Subject();
+  private readonly _destroyed = new Subject<void>();
 
   /** The menu stack for this trigger and its associated menus. */
   private readonly _menuStack = new MenuStack();
diff --git a/src/cdk-experimental/menu/menu-item-selectable.ts b/src/cdk-experimental/menu/menu-item-selectable.ts
index 971c3dd62d57..10d50ace28da 100644
--- a/src/cdk-experimental/menu/menu-item-selectable.ts
+++ b/src/cdk-experimental/menu/menu-item-selectable.ts
@@ -20,7 +20,8 @@ let nextId = 0;
 @Directive()
 export abstract class CdkMenuItemSelectable extends CdkMenuItem {
   /** Event emitted when the selectable item is clicked */
-  @Output('cdkMenuItemToggled') toggled: EventEmitter<CdkMenuItemSelectable> = new EventEmitter();
+  @Output('cdkMenuItemToggled') readonly toggled: EventEmitter<CdkMenuItemSelectable> =
+      new EventEmitter();
 
   /** Whether the element is checked */
   @Input()
diff --git a/src/cdk-experimental/menu/menu-item.ts b/src/cdk-experimental/menu/menu-item.ts
index 8961186a99bf..ea6e067931fd 100644
--- a/src/cdk-experimental/menu/menu-item.ts
+++ b/src/cdk-experimental/menu/menu-item.ts
@@ -70,7 +70,7 @@ export class CdkMenuItem implements FocusableOption, FocusableElement, Toggler,
    * If this MenuItem is a regular MenuItem, outputs when it is triggered by a keyboard or mouse
    * event.
    */
-  @Output('cdkMenuItemTriggered') triggered: EventEmitter<void> = new EventEmitter();
+  @Output('cdkMenuItemTriggered') readonly triggered: EventEmitter<void> = new EventEmitter();
 
   /**
    * The tabindex for this menu item managed internally and used for implementing roving a
@@ -79,7 +79,7 @@ export class CdkMenuItem implements FocusableOption, FocusableElement, Toggler,
   _tabindex: 0 | -1 = -1;
 
   /** Emits when the menu item is destroyed. */
-  private readonly _destroyed: Subject<void> = new Subject();
+  private readonly _destroyed = new Subject<void>();
 
   constructor(
     readonly _elementRef: ElementRef<HTMLElement>,
diff --git a/src/cdk-experimental/popover-edit/focus-escape-notifier.ts b/src/cdk-experimental/popover-edit/focus-escape-notifier.ts
index c9b1703ff623..a1c42c659642 100644
--- a/src/cdk-experimental/popover-edit/focus-escape-notifier.ts
+++ b/src/cdk-experimental/popover-edit/focus-escape-notifier.ts
@@ -22,7 +22,7 @@ export const enum FocusEscapeNotifierDirection {
  * focus leaves the region.
  */
 export class FocusEscapeNotifier extends FocusTrap {
-  private _escapeSubject = new Subject<FocusEscapeNotifierDirection>();
+  private readonly _escapeSubject = new Subject<FocusEscapeNotifierDirection>();
 
   constructor(
       element: HTMLElement,
diff --git a/src/cdk-experimental/popover-edit/lens-directives.ts b/src/cdk-experimental/popover-edit/lens-directives.ts
index 5772fdea78d3..29900659e928 100644
--- a/src/cdk-experimental/popover-edit/lens-directives.ts
+++ b/src/cdk-experimental/popover-edit/lens-directives.ts
@@ -84,7 +84,7 @@ export class CdkEditControl<FormValue> implements OnDestroy, OnInit {
   // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
   // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
   // can move this back into `host`.
-  // tslint:disable:no-host-decorator-in-concrete
+  // tslint:disable-next-line:no-host-decorator-in-concrete
   @HostListener('ngSubmit')
   handleFormSubmit(): void {
     if (this.ignoreSubmitUnlessValid && !this.editRef.isValid()) { return; }
@@ -107,7 +107,7 @@ export class CdkEditControl<FormValue> implements OnDestroy, OnInit {
   // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
   // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
   // can move this back into `host`.
-  // tslint:disable:no-host-decorator-in-concrete
+  // tslint:disable-next-line:no-host-decorator-in-concrete
   @HostListener('document:click', ['$event'])
   handlePossibleClickOut(evt: Event): void {
     if (closest(evt.target, EDIT_PANE_SELECTOR)) { return; }
@@ -128,7 +128,7 @@ export class CdkEditControl<FormValue> implements OnDestroy, OnInit {
   // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
   // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
   // can move this back into `host`.
-  // tslint:disable:no-host-decorator-in-concrete
+  // tslint:disable-next-line:no-host-decorator-in-concrete
   @HostListener('keydown', ['$event'])
   _handleKeydown(event: KeyboardEvent) {
     if (event.key === 'Escape' && !hasModifierKey(event)) {
@@ -167,7 +167,7 @@ export class CdkEditRevert<FormValue> {
   // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
   // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
   // can move this back into `host`.
-  // tslint:disable:no-host-decorator-in-concrete
+  // tslint:disable-next-line:no-host-decorator-in-concrete
   @HostListener('click')
   revertEdit(): void {
     this.editRef.reset();
@@ -192,10 +192,8 @@ export class CdkEditClose<FormValue> {
   // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
   // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
   // can move this back into `host`.
-  // tslint:disable:no-host-decorator-in-concrete
-  @HostListener('click')
-  @HostListener('keydown.enter')
-  @HostListener('keydown.space')
+  // tslint:disable-next-line:no-host-decorator-in-concrete
+  @HostListener('click') @HostListener('keydown.enter') @HostListener('keydown.space')
   closeEdit(): void {
     // Note that we use `click` here, rather than a keyboard event, because some screen readers
     // will emit a fake click event instead of an enter keyboard event on buttons. For the keyboard
diff --git a/src/cdk-experimental/popover-edit/table-directives.ts b/src/cdk-experimental/popover-edit/table-directives.ts
index a50f17b01c94..3ee7af68d0cb 100644
--- a/src/cdk-experimental/popover-edit/table-directives.ts
+++ b/src/cdk-experimental/popover-edit/table-directives.ts
@@ -501,7 +501,7 @@ export class CdkEditOpen {
   // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
   // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
   // can move this back into `host`.
-  // tslint:disable:no-host-decorator-in-concrete
+  // tslint:disable-next-line:no-host-decorator-in-concrete
   @HostListener('click', ['$event'])
   openEdit(evt: Event): void {
     this.editEventDispatcher.editing.next(closest(this.elementRef.nativeElement!, CELL_SELECTOR));
diff --git a/src/cdk-experimental/selection/selection.ts b/src/cdk-experimental/selection/selection.ts
index 3c9a91bdfd25..f6ca11ff2ab3 100644
--- a/src/cdk-experimental/selection/selection.ts
+++ b/src/cdk-experimental/selection/selection.ts
@@ -60,7 +60,7 @@ export class CdkSelection<T> implements OnInit, AfterContentChecked, CollectionV
   protected _multiple: boolean;
 
   /** Emits when selection changes. */
-  @Output('cdkSelectionChange') change = new EventEmitter<SelectionChange<T>>();
+  @Output('cdkSelectionChange') readonly change = new EventEmitter<SelectionChange<T>>();
 
   /** Latest data provided by the data source. */
   private _data: T[]|readonly T[];
diff --git a/src/cdk/a11y/focus-monitor/focus-monitor.ts b/src/cdk/a11y/focus-monitor/focus-monitor.ts
index 96c118f8eb12..2fe97c6cf1f1 100644
--- a/src/cdk/a11y/focus-monitor/focus-monitor.ts
+++ b/src/cdk/a11y/focus-monitor/focus-monitor.ts
@@ -71,7 +71,7 @@ export const FOCUS_MONITOR_DEFAULT_OPTIONS =
 
 type MonitoredElementInfo = {
   checkChildren: boolean,
-  subject: Subject<FocusOrigin>,
+  readonly subject: Subject<FocusOrigin>,
   rootNode: HTMLElement|ShadowRoot|Document
 };
 
@@ -604,7 +604,7 @@ function getTarget(event: Event): HTMLElement|null {
 })
 export class CdkMonitorFocus implements AfterViewInit, OnDestroy {
   private _monitorSubscription: Subscription;
-  @Output() cdkFocusChange = new EventEmitter<FocusOrigin>();
+  @Output() readonly cdkFocusChange = new EventEmitter<FocusOrigin>();
 
   constructor(private _elementRef: ElementRef<HTMLElement>, private _focusMonitor: FocusMonitor) {}
 
diff --git a/src/cdk/a11y/key-manager/list-key-manager.ts b/src/cdk/a11y/key-manager/list-key-manager.ts
index fcd27e27c7e0..fe47b4f72661 100644
--- a/src/cdk/a11y/key-manager/list-key-manager.ts
+++ b/src/cdk/a11y/key-manager/list-key-manager.ts
@@ -44,7 +44,7 @@ export class ListKeyManager<T extends ListKeyManagerOption> {
   private _activeItemIndex = -1;
   private _activeItem: T | null = null;
   private _wrap = false;
-  private _letterKeyStream = new Subject<string>();
+  private readonly _letterKeyStream = new Subject<string>();
   private _typeaheadSubscription = Subscription.EMPTY;
   private _vertical = true;
   private _horizontal: 'ltr' | 'rtl' | null;
@@ -82,10 +82,10 @@ export class ListKeyManager<T extends ListKeyManagerOption> {
    * Stream that emits any time the TAB key is pressed, so components can react
    * when focus is shifted off of the list.
    */
-  tabOut: Subject<void> = new Subject<void>();
+  readonly tabOut = new Subject<void>();
 
   /** Stream that emits whenever the active item of the list manager changes. */
-  change = new Subject<number>();
+  readonly change = new Subject<number>();
 
   /**
    * Sets the predicate function that determines which items should be skipped by the
diff --git a/src/cdk/a11y/live-announcer/live-announcer.md b/src/cdk/a11y/live-announcer/live-announcer.md
index 492b2b883653..c58adaa6f9f1 100644
--- a/src/cdk/a11y/live-announcer/live-announcer.md
+++ b/src/cdk/a11y/live-announcer/live-announcer.md
@@ -1,12 +1,12 @@
 ### LiveAnnouncer
 `LiveAnnouncer` is used to announce messages for screen-reader users using an `aria-live` region.
 See [the W3C's WAI-ARIA](https://www.w3.org/TR/wai-aria/states_and_properties#aria-live)
-for more information on aria-live regions. 
+for more information on aria-live regions.
 
 #### Methods
 
 ##### `announce(message: string, politeness?: 'off' | 'polite' | 'assertive'): void`
-Announce the given message via aria-live region. The politeness argument determines the 
+Announce the given message via aria-live region. The politeness argument determines the
 `aria-live` attribute on the announcer element, defaulting to 'polite'.
 
 #### Examples
@@ -18,9 +18,8 @@ The LiveAnnouncer is injected into a component:
 })
 export class MyComponent {
 
- constructor(liveAnnouncer: LiveAnnouncer) {
-   liveAnnouncer.announce("Hey Google");
- }
-
+  constructor(liveAnnouncer: LiveAnnouncer) {
+    liveAnnouncer.announce("Hey Google");
+  }
 }
 ```
diff --git a/src/cdk/accordion/accordion-item.ts b/src/cdk/accordion/accordion-item.ts
index 48268ffeb740..c5f1bc8bc6ed 100644
--- a/src/cdk/accordion/accordion-item.ts
+++ b/src/cdk/accordion/accordion-item.ts
@@ -42,18 +42,18 @@ export class CdkAccordionItem implements OnDestroy {
   /** Subscription to openAll/closeAll events. */
   private _openCloseAllSubscription = Subscription.EMPTY;
   /** Event emitted every time the AccordionItem is closed. */
-  @Output() closed: EventEmitter<void> = new EventEmitter<void>();
+  @Output() readonly closed: EventEmitter<void> = new EventEmitter<void>();
   /** Event emitted every time the AccordionItem is opened. */
-  @Output() opened: EventEmitter<void> = new EventEmitter<void>();
+  @Output() readonly opened: EventEmitter<void> = new EventEmitter<void>();
   /** Event emitted when the AccordionItem is destroyed. */
-  @Output() destroyed: EventEmitter<void> = new EventEmitter<void>();
+  @Output() readonly destroyed: EventEmitter<void> = new EventEmitter<void>();
 
   /**
    * Emits whenever the expanded state of the accordion changes.
    * Primarily used to facilitate two-way binding.
    * @docs-private
    */
-  @Output() expandedChange: EventEmitter<boolean> = new EventEmitter<boolean>();
+  @Output() readonly expandedChange: EventEmitter<boolean> = new EventEmitter<boolean>();
 
   /** The unique AccordionItem id. */
   readonly id: string = `cdk-accordion-child-${nextId++}`;
diff --git a/src/cdk/bidi/dir.ts b/src/cdk/bidi/dir.ts
index 2244cea3c8bb..55e6d242d10b 100644
--- a/src/cdk/bidi/dir.ts
+++ b/src/cdk/bidi/dir.ts
@@ -40,7 +40,7 @@ export class Dir implements Directionality, AfterContentInit, OnDestroy {
   _rawDir: string;
 
   /** Event emitted when the direction changes. */
-  @Output('dirChange') change = new EventEmitter<Direction>();
+  @Output('dirChange') readonly change = new EventEmitter<Direction>();
 
   /** @docs-private */
   @Input()
diff --git a/src/cdk/clipboard/copy-to-clipboard.ts b/src/cdk/clipboard/copy-to-clipboard.ts
index 50457567e3f8..276963b34698 100644
--- a/src/cdk/clipboard/copy-to-clipboard.ts
+++ b/src/cdk/clipboard/copy-to-clipboard.ts
@@ -60,7 +60,7 @@ export class CdkCopyToClipboard implements OnDestroy {
    * Emits when some text is copied to the clipboard. The
    * emitted value indicates whether copying was successful.
    */
-  @Output('cdkCopyToClipboardCopied') copied = new EventEmitter<boolean>();
+  @Output('cdkCopyToClipboardCopied') readonly copied = new EventEmitter<boolean>();
 
   /** Copies that are currently being attempted. */
   private _pending = new Set<PendingCopy>();
diff --git a/src/cdk/collections/selection-model.ts b/src/cdk/collections/selection-model.ts
index 17eca7ddf274..da39957d078f 100644
--- a/src/cdk/collections/selection-model.ts
+++ b/src/cdk/collections/selection-model.ts
@@ -34,7 +34,7 @@ export class SelectionModel<T> {
   }
 
   /** Event emitted when the value has changed. */
-  changed: Subject<SelectionChange<T>> = new Subject();
+  readonly changed = new Subject<SelectionChange<T>>();
 
   constructor(
     private _multiple = false,
diff --git a/src/cdk/drag-drop/directives/drag-handle.ts b/src/cdk/drag-drop/directives/drag-handle.ts
index e4b22c44bb45..d9ff06137988 100644
--- a/src/cdk/drag-drop/directives/drag-handle.ts
+++ b/src/cdk/drag-drop/directives/drag-handle.ts
@@ -41,7 +41,7 @@ export class CdkDragHandle implements OnDestroy {
   _parentDrag: {} | undefined;
 
   /** Emits when the state of the handle has changed. */
-  _stateChanges = new Subject<CdkDragHandle>();
+  readonly _stateChanges = new Subject<CdkDragHandle>();
 
   /** Whether starting to drag through this handle is disabled. */
   @Input('cdkDragHandleDisabled')
diff --git a/src/cdk/drag-drop/directives/drag.ts b/src/cdk/drag-drop/directives/drag.ts
index e00390f66696..799f132a1c0c 100644
--- a/src/cdk/drag-drop/directives/drag.ts
+++ b/src/cdk/drag-drop/directives/drag.ts
@@ -70,7 +70,7 @@ const DRAG_HOST_CLASS = 'cdk-drag';
   providers: [{provide: CDK_DRAG_PARENT, useExisting: CdkDrag}]
 })
 export class CdkDrag<T = any> implements AfterViewInit, OnChanges, OnDestroy {
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
   private static _dragInstances: CdkDrag[] = [];
 
   /** Reference to the underlying drag instance. */
@@ -156,32 +156,34 @@ export class CdkDrag<T = any> implements AfterViewInit, OnChanges, OnDestroy {
   @Input('cdkDragPreviewContainer') previewContainer: PreviewContainer;
 
   /** Emits when the user starts dragging the item. */
-  @Output('cdkDragStarted') started: EventEmitter<CdkDragStart> = new EventEmitter<CdkDragStart>();
+  @Output('cdkDragStarted') readonly started: EventEmitter<CdkDragStart> =
+      new EventEmitter<CdkDragStart>();
 
   /** Emits when the user has released a drag item, before any animations have started. */
-  @Output('cdkDragReleased') released: EventEmitter<CdkDragRelease> =
+  @Output('cdkDragReleased') readonly released: EventEmitter<CdkDragRelease> =
       new EventEmitter<CdkDragRelease>();
 
   /** Emits when the user stops dragging an item in the container. */
-  @Output('cdkDragEnded') ended: EventEmitter<CdkDragEnd> = new EventEmitter<CdkDragEnd>();
+  @Output('cdkDragEnded') readonly ended: EventEmitter<CdkDragEnd> = new EventEmitter<CdkDragEnd>();
 
   /** Emits when the user has moved the item into a new container. */
-  @Output('cdkDragEntered') entered: EventEmitter<CdkDragEnter<any>> =
+  @Output('cdkDragEntered') readonly entered: EventEmitter<CdkDragEnter<any>> =
       new EventEmitter<CdkDragEnter<any>>();
 
   /** Emits when the user removes the item its container by dragging it into another container. */
-  @Output('cdkDragExited') exited: EventEmitter<CdkDragExit<any>> =
+  @Output('cdkDragExited') readonly exited: EventEmitter<CdkDragExit<any>> =
       new EventEmitter<CdkDragExit<any>>();
 
   /** Emits when the user drops the item inside a container. */
-  @Output('cdkDragDropped') dropped: EventEmitter<CdkDragDrop<any>> =
+  @Output('cdkDragDropped') readonly dropped: EventEmitter<CdkDragDrop<any>> =
       new EventEmitter<CdkDragDrop<any>>();
 
   /**
    * Emits as the user is dragging the item. Use with caution,
    * because this event will fire for every pixel that the user has dragged.
    */
-  @Output('cdkDragMoved') moved: Observable<CdkDragMove<T>> =
+  @Output('cdkDragMoved')
+  readonly moved:  Observable<CdkDragMove<T>> =
       new Observable((observer: Observer<CdkDragMove<T>>) => {
         const subscription = this._dragRef.moved.pipe(map(movedEvent => ({
           source: this,
diff --git a/src/cdk/drag-drop/directives/drop-list.ts b/src/cdk/drag-drop/directives/drop-list.ts
index c209436ae33d..691b313e7584 100644
--- a/src/cdk/drag-drop/directives/drop-list.ts
+++ b/src/cdk/drag-drop/directives/drop-list.ts
@@ -75,7 +75,7 @@ export const CDK_DROP_LIST = new InjectionToken<CdkDropList>('CdkDropList');
 })
 export class CdkDropList<T = any> implements OnDestroy {
   /** Emits when the list has been destroyed. */
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   /** Whether the element's scrollable parents have been resolved. */
   private _scrollableParentsResolved: boolean;
@@ -148,24 +148,24 @@ export class CdkDropList<T = any> implements OnDestroy {
 
   /** Emits when the user drops an item inside the container. */
   @Output('cdkDropListDropped')
-  dropped: EventEmitter<CdkDragDrop<T, any>> = new EventEmitter<CdkDragDrop<T, any>>();
+  readonly dropped: EventEmitter<CdkDragDrop<T, any>> = new EventEmitter<CdkDragDrop<T, any>>();
 
   /**
    * Emits when the user has moved a new drag item into this container.
    */
   @Output('cdkDropListEntered')
-  entered: EventEmitter<CdkDragEnter<T>> = new EventEmitter<CdkDragEnter<T>>();
+  readonly entered: EventEmitter<CdkDragEnter<T>> = new EventEmitter<CdkDragEnter<T>>();
 
   /**
    * Emits when the user removes an item from the container
    * by dragging it into another container.
    */
   @Output('cdkDropListExited')
-  exited: EventEmitter<CdkDragExit<T>> = new EventEmitter<CdkDragExit<T>>();
+  readonly exited: EventEmitter<CdkDragExit<T>> = new EventEmitter<CdkDragExit<T>>();
 
   /** Emits as the user is swapping items while actively dragging. */
   @Output('cdkDropListSorted')
-  sorted: EventEmitter<CdkDragSortEvent<T>> = new EventEmitter<CdkDragSortEvent<T>>();
+  readonly sorted: EventEmitter<CdkDragSortEvent<T>> = new EventEmitter<CdkDragSortEvent<T>>();
 
   /**
    * Keeps track of the items that are registered with this container. Historically we used to
diff --git a/src/cdk/drag-drop/drag-ref.ts b/src/cdk/drag-drop/drag-ref.ts
index 863c1aa88d8d..b1f99a5f55b9 100644
--- a/src/cdk/drag-drop/drag-ref.ts
+++ b/src/cdk/drag-drop/drag-ref.ts
@@ -161,7 +161,7 @@ export class DragRef<T = any> {
   private _parentPositions: ParentPositionTracker;
 
   /** Emits when the item is being moved. */
-  private _moveEvents = new Subject<{
+  private readonly _moveEvents = new Subject<{
     source: DragRef;
     pointerPosition: {x: number, y: number};
     event: MouseEvent | TouchEvent;
@@ -285,25 +285,25 @@ export class DragRef<T = any> {
   private _disabled = false;
 
   /** Emits as the drag sequence is being prepared. */
-  beforeStarted = new Subject<void>();
+  readonly beforeStarted = new Subject<void>();
 
   /** Emits when the user starts dragging the item. */
-  started = new Subject<{source: DragRef}>();
+  readonly started = new Subject<{source: DragRef}>();
 
   /** Emits when the user has released a drag item, before any animations have started. */
-  released = new Subject<{source: DragRef}>();
+  readonly released = new Subject<{source: DragRef}>();
 
   /** Emits when the user stops dragging an item in the container. */
-  ended = new Subject<{source: DragRef, distance: Point, dropPoint: Point}>();
+  readonly ended = new Subject<{source: DragRef, distance: Point, dropPoint: Point}>();
 
   /** Emits when the user has moved the item into a new container. */
-  entered = new Subject<{container: DropListRef, item: DragRef, currentIndex: number}>();
+  readonly entered = new Subject<{container: DropListRef, item: DragRef, currentIndex: number}>();
 
   /** Emits when the user removes the item its container by dragging it into another container. */
-  exited = new Subject<{container: DropListRef, item: DragRef}>();
+  readonly exited = new Subject<{container: DropListRef, item: DragRef}>();
 
   /** Emits when the user drops the item inside a container. */
-  dropped = new Subject<{
+  readonly dropped = new Subject<{
     previousIndex: number;
     currentIndex: number;
     item: DragRef;
@@ -318,7 +318,7 @@ export class DragRef<T = any> {
    * Emits as the user is dragging the item. Use with caution,
    * because this event will fire for every pixel that the user has dragged.
    */
-  moved: Observable<{
+  readonly moved: Observable<{
     source: DragRef;
     pointerPosition: {x: number, y: number};
     event: MouseEvent | TouchEvent;
diff --git a/src/cdk/drag-drop/drop-list-ref.ts b/src/cdk/drag-drop/drop-list-ref.ts
index dc5ca71b0da7..4828313d7148 100644
--- a/src/cdk/drag-drop/drop-list-ref.ts
+++ b/src/cdk/drag-drop/drop-list-ref.ts
@@ -98,21 +98,21 @@ export class DropListRef<T = any> {
   sortPredicate: (index: number, drag: DragRef, drop: DropListRef) => boolean = () => true;
 
   /** Emits right before dragging has started. */
-  beforeStarted = new Subject<void>();
+  readonly beforeStarted = new Subject<void>();
 
   /**
    * Emits when the user has moved a new drag item into this container.
    */
-  entered = new Subject<{item: DragRef, container: DropListRef, currentIndex: number}>();
+  readonly entered = new Subject<{item: DragRef, container: DropListRef, currentIndex: number}>();
 
   /**
    * Emits when the user removes an item from the container
    * by dragging it into another container.
    */
-  exited = new Subject<{item: DragRef, container: DropListRef}>();
+  readonly exited = new Subject<{item: DragRef, container: DropListRef}>();
 
   /** Emits when the user drops an item inside the container. */
-  dropped = new Subject<{
+  readonly dropped = new Subject<{
     item: DragRef,
     currentIndex: number,
     previousIndex: number,
@@ -124,7 +124,7 @@ export class DropListRef<T = any> {
   }>();
 
   /** Emits as the user is swapping items while actively dragging. */
-  sorted = new Subject<{
+  readonly sorted = new Subject<{
     previousIndex: number,
     currentIndex: number,
     container: DropListRef,
@@ -188,7 +188,7 @@ export class DropListRef<T = any> {
   private _scrollNode: HTMLElement | Window;
 
   /** Used to signal to the current auto-scroll sequence when to stop. */
-  private _stopScrollTimers = new Subject<void>();
+  private readonly _stopScrollTimers = new Subject<void>();
 
   /** Shadow root of the current element. Necessary for `elementFromPoint` to resolve correctly. */
   private _cachedShadowRoot: DocumentOrShadowRoot | null = null;
diff --git a/src/cdk/layout/breakpoints-observer.ts b/src/cdk/layout/breakpoints-observer.ts
index e095053772f1..11e0e5fc1be2 100644
--- a/src/cdk/layout/breakpoints-observer.ts
+++ b/src/cdk/layout/breakpoints-observer.ts
@@ -45,7 +45,7 @@ export class BreakpointObserver implements OnDestroy {
   /**  A map of all media queries currently being listened for. */
   private _queries = new Map<string, Query>();
   /** A subject for all other observables to takeUntil based on. */
-  private _destroySubject = new Subject<void>();
+  private readonly _destroySubject = new Subject<void>();
 
   constructor(private _mediaMatcher: MediaMatcher, private _zone: NgZone) {}
 
diff --git a/src/cdk/observers/observe-content.ts b/src/cdk/observers/observe-content.ts
index 1b45092875bf..849d13894d5d 100644
--- a/src/cdk/observers/observe-content.ts
+++ b/src/cdk/observers/observe-content.ts
@@ -46,7 +46,7 @@ export class ContentObserver implements OnDestroy {
   /** Keeps track of the existing MutationObservers so they can be reused. */
   private _observedElements = new Map<Element, {
     observer: MutationObserver | null,
-    stream: Subject<MutationRecord[]>,
+    readonly stream: Subject<MutationRecord[]>,
     count: number
   }>();
 
@@ -141,7 +141,7 @@ export class ContentObserver implements OnDestroy {
 })
 export class CdkObserveContent implements AfterContentInit, OnDestroy {
   /** Event emitted for each change in the element's content. */
-  @Output('cdkObserveContent') event = new EventEmitter<MutationRecord[]>();
+  @Output('cdkObserveContent') readonly event = new EventEmitter<MutationRecord[]>();
 
   /**
    * Whether observing content is disabled. This option can be used
diff --git a/src/cdk/overlay/overlay-directives.ts b/src/cdk/overlay/overlay-directives.ts
index 7120f009c92b..68fb20211c65 100644
--- a/src/cdk/overlay/overlay-directives.ts
+++ b/src/cdk/overlay/overlay-directives.ts
@@ -208,22 +208,22 @@ export class CdkConnectedOverlay implements OnDestroy, OnChanges {
   set push(value: boolean) { this._push = coerceBooleanProperty(value); }
 
   /** Event emitted when the backdrop is clicked. */
-  @Output() backdropClick = new EventEmitter<MouseEvent>();
+  @Output() readonly backdropClick = new EventEmitter<MouseEvent>();
 
   /** Event emitted when the position has changed. */
-  @Output() positionChange = new EventEmitter<ConnectedOverlayPositionChange>();
+  @Output() readonly positionChange = new EventEmitter<ConnectedOverlayPositionChange>();
 
   /** Event emitted when the overlay has been attached. */
-  @Output() attach = new EventEmitter<void>();
+  @Output() readonly attach = new EventEmitter<void>();
 
   /** Event emitted when the overlay has been detached. */
-  @Output() detach = new EventEmitter<void>();
+  @Output() readonly detach = new EventEmitter<void>();
 
   /** Emits when there are keyboard events that are targeted at the overlay. */
-  @Output() overlayKeydown = new EventEmitter<KeyboardEvent>();
+  @Output() readonly overlayKeydown = new EventEmitter<KeyboardEvent>();
 
   /** Emits when there are mouse outside click events that are targeted at the overlay. */
-  @Output() overlayOutsideClick = new EventEmitter<MouseEvent>();
+  @Output() readonly overlayOutsideClick = new EventEmitter<MouseEvent>();
 
   // TODO(jelbourn): inputs for size, scroll behavior, animation, etc.
 
diff --git a/src/cdk/overlay/overlay-ref.ts b/src/cdk/overlay/overlay-ref.ts
index d91a7b43ec9f..5a604b93698a 100644
--- a/src/cdk/overlay/overlay-ref.ts
+++ b/src/cdk/overlay/overlay-ref.ts
@@ -32,9 +32,9 @@ export type ImmutableObject<T> = {
  */
 export class OverlayRef implements PortalOutlet, OverlayReference {
   private _backdropElement: HTMLElement | null = null;
-  private _backdropClick: Subject<MouseEvent> = new Subject();
-  private _attachments = new Subject<void>();
-  private _detachments = new Subject<void>();
+  private readonly _backdropClick = new Subject<MouseEvent>();
+  private readonly _attachments = new Subject<void>();
+  private readonly _detachments = new Subject<void>();
   private _positionStrategy: PositionStrategy | undefined;
   private _scrollStrategy: ScrollStrategy | undefined;
   private _locationChanges: SubscriptionLike = Subscription.EMPTY;
@@ -47,10 +47,10 @@ export class OverlayRef implements PortalOutlet, OverlayReference {
   private _previousHostParent: HTMLElement;
 
   /** Stream of keydown events dispatched to this overlay. */
-  _keydownEvents = new Subject<KeyboardEvent>();
+  readonly _keydownEvents = new Subject<KeyboardEvent>();
 
   /** Stream of mouse outside events dispatched to this overlay. */
-  _outsidePointerEvents = new Subject<MouseEvent>();
+  readonly _outsidePointerEvents = new Subject<MouseEvent>();
 
   constructor(
       private _portalOutlet: PortalOutlet,
diff --git a/src/cdk/overlay/overlay-reference.ts b/src/cdk/overlay/overlay-reference.ts
index e40e9527d3cd..95b4d0f4d5fe 100644
--- a/src/cdk/overlay/overlay-reference.ts
+++ b/src/cdk/overlay/overlay-reference.ts
@@ -27,6 +27,6 @@ export interface OverlayReference {
   updatePosition: () => void;
   getDirection: () => Direction;
   setDirection: (dir: Direction | Directionality) => void;
-  _outsidePointerEvents: Subject<MouseEvent>;
-  _keydownEvents: Subject<KeyboardEvent>;
+  readonly _outsidePointerEvents: Subject<MouseEvent>;
+  readonly _keydownEvents: Subject<KeyboardEvent>;
 }
diff --git a/src/cdk/overlay/position/flexible-connected-position-strategy.ts b/src/cdk/overlay/position/flexible-connected-position-strategy.ts
index 133827d8f413..f7fc206ddd07 100644
--- a/src/cdk/overlay/position/flexible-connected-position-strategy.ts
+++ b/src/cdk/overlay/position/flexible-connected-position-strategy.ts
@@ -107,7 +107,7 @@ export class FlexibleConnectedPositionStrategy implements PositionStrategy {
   private _lastPosition: ConnectedPosition | null;
 
   /** Subject that emits whenever the position changes. */
-  private _positionChanges = new Subject<ConnectedOverlayPositionChange>();
+  private readonly _positionChanges = new Subject<ConnectedOverlayPositionChange>();
 
   /** Subscription to viewport size changes. */
   private _resizeSubscription = Subscription.EMPTY;
diff --git a/src/cdk/portal/portal-directives.ts b/src/cdk/portal/portal-directives.ts
index 9808e9fb68f9..d257451d8939 100644
--- a/src/cdk/portal/portal-directives.ts
+++ b/src/cdk/portal/portal-directives.ts
@@ -118,7 +118,7 @@ export class CdkPortalOutlet extends BasePortalOutlet implements OnInit, OnDestr
   }
 
   /** Emits when a portal is attached to the outlet. */
-  @Output() attached: EventEmitter<CdkPortalOutletAttachedRef> =
+  @Output() readonly attached: EventEmitter<CdkPortalOutletAttachedRef> =
       new EventEmitter<CdkPortalOutletAttachedRef>();
 
   /** Component or view reference that is attached to the portal. */
diff --git a/src/cdk/scrolling/fixed-size-virtual-scroll.ts b/src/cdk/scrolling/fixed-size-virtual-scroll.ts
index f19f10ad3f66..eeb7480d65b9 100644
--- a/src/cdk/scrolling/fixed-size-virtual-scroll.ts
+++ b/src/cdk/scrolling/fixed-size-virtual-scroll.ts
@@ -16,7 +16,7 @@ import {CdkVirtualScrollViewport} from './virtual-scroll-viewport';
 
 /** Virtual scrolling strategy for lists with items of known fixed size. */
 export class FixedSizeVirtualScrollStrategy implements VirtualScrollStrategy {
-  private _scrolledIndexChange = new Subject<number>();
+  private readonly _scrolledIndexChange = new Subject<number>();
 
   /** @docs-private Implemented as part of VirtualScrollStrategy. */
   scrolledIndexChange: Observable<number> = this._scrolledIndexChange.pipe(distinctUntilChanged());
diff --git a/src/cdk/scrolling/scroll-dispatcher.ts b/src/cdk/scrolling/scroll-dispatcher.ts
index 7da1485f3740..07664a462879 100644
--- a/src/cdk/scrolling/scroll-dispatcher.ts
+++ b/src/cdk/scrolling/scroll-dispatcher.ts
@@ -33,7 +33,7 @@ export class ScrollDispatcher implements OnDestroy {
   }
 
   /** Subject for notifying that a registered scrollable reference element has been scrolled. */
-  private _scrolled = new Subject<CdkScrollable|void>();
+  private readonly _scrolled = new Subject<CdkScrollable|void>();
 
   /** Keeps track of the global `scroll` and `resize` subscriptions. */
   _globalSubscription: Subscription | null = null;
diff --git a/src/cdk/scrolling/scrollable.ts b/src/cdk/scrolling/scrollable.ts
index c9b33029ef2b..279aaf7fe6cc 100644
--- a/src/cdk/scrolling/scrollable.ts
+++ b/src/cdk/scrolling/scrollable.ts
@@ -45,7 +45,7 @@ export type ExtendedScrollToOptions = _XAxis & _YAxis & ScrollOptions;
   selector: '[cdk-scrollable], [cdkScrollable]'
 })
 export class CdkScrollable implements OnInit, OnDestroy {
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   private _elementScrolled: Observable<Event> = new Observable((observer: Observer<Event>) =>
       this.ngZone.runOutsideAngular(() =>
diff --git a/src/cdk/scrolling/viewport-ruler.ts b/src/cdk/scrolling/viewport-ruler.ts
index 693189378483..fb4ff22bc036 100644
--- a/src/cdk/scrolling/viewport-ruler.ts
+++ b/src/cdk/scrolling/viewport-ruler.ts
@@ -31,7 +31,7 @@ export class ViewportRuler implements OnDestroy {
   private _viewportSize: {width: number; height: number};
 
   /** Stream of viewport change events. */
-  private _change = new Subject<Event>();
+  private readonly _change = new Subject<Event>();
 
   /** Event listener that will be used to handle the viewport change events. */
   private _changeListener = (event: Event) => {
diff --git a/src/cdk/scrolling/virtual-for-of.ts b/src/cdk/scrolling/virtual-for-of.ts
index 94dbf1c1e69b..e42026694aa8 100644
--- a/src/cdk/scrolling/virtual-for-of.ts
+++ b/src/cdk/scrolling/virtual-for-of.ts
@@ -90,10 +90,10 @@ function getOffset(orientation: 'horizontal' | 'vertical', direction: 'start' |
 export class CdkVirtualForOf<T> implements
     CdkVirtualScrollRepeater<T>, CollectionViewer, DoCheck, OnDestroy {
   /** Emits when the rendered view of the data changes. */
-  viewChange = new Subject<ListRange>();
+  readonly viewChange = new Subject<ListRange>();
 
   /** Subject that emits when a new DataSource instance is given. */
-  private _dataSourceChanges = new Subject<DataSource<T>>();
+  private readonly _dataSourceChanges = new Subject<DataSource<T>>();
 
   /** The DataSource to display. */
   @Input()
@@ -151,7 +151,7 @@ export class CdkVirtualForOf<T> implements
   }
 
   /** Emits whenever the data in the current DataSource changes. */
-  dataStream: Observable<readonly T[]> = this._dataSourceChanges
+  readonly dataStream: Observable<readonly T[]> = this._dataSourceChanges
   .pipe(
       // Start off with null `DataSource`.
       startWith(null),
@@ -179,7 +179,7 @@ export class CdkVirtualForOf<T> implements
   /** Whether the rendered data should be updated during the next ngDoCheck cycle. */
   private _needsUpdate = false;
 
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   constructor(
       /** The view container to add items to. */
diff --git a/src/cdk/scrolling/virtual-scroll-repeater.ts b/src/cdk/scrolling/virtual-scroll-repeater.ts
index dfbbe8b267d8..48ca4db32b60 100644
--- a/src/cdk/scrolling/virtual-scroll-repeater.ts
+++ b/src/cdk/scrolling/virtual-scroll-repeater.ts
@@ -13,6 +13,6 @@ import {ListRange} from '@angular/cdk/collections';
  * An item to be repeated by the VirtualScrollViewport
  */
 export interface CdkVirtualScrollRepeater<T> {
-  dataStream: Observable<readonly T[]>;
+  readonly dataStream: Observable<readonly T[]>;
   measureRangeSize(range: ListRange, orientation: 'horizontal' | 'vertical'): number;
 }
diff --git a/src/cdk/scrolling/virtual-scroll-viewport.ts b/src/cdk/scrolling/virtual-scroll-viewport.ts
index 086e8d9e4a73..5eae4fd7bc6c 100644
--- a/src/cdk/scrolling/virtual-scroll-viewport.ts
+++ b/src/cdk/scrolling/virtual-scroll-viewport.ts
@@ -71,10 +71,10 @@ const SCROLL_SCHEDULER =
 })
 export class CdkVirtualScrollViewport extends CdkScrollable implements OnInit, OnDestroy {
   /** Emits when the viewport is detached from a CdkVirtualForOf. */
-  private _detachedSubject = new Subject<void>();
+  private readonly _detachedSubject = new Subject<void>();
 
   /** Emits when the rendered range changes. */
-  private _renderedRangeSubject = new Subject<ListRange>();
+  private readonly _renderedRangeSubject = new Subject<ListRange>();
 
   /** The direction the viewport scrolls. */
   @Input()
@@ -94,16 +94,16 @@ export class CdkVirtualScrollViewport extends CdkScrollable implements OnInit, O
   // depending on how the strategy calculates the scrolled index, it may come at a cost to
   // performance.
   /** Emits when the index of the first element visible in the viewport changes. */
-  @Output() scrolledIndexChange: Observable<number> =
-      new Observable((observer: Observer<number>) =>
-        this._scrollStrategy.scrolledIndexChange.subscribe(index =>
-            Promise.resolve().then(() => this.ngZone.run(() => observer.next(index)))));
+  @Output()
+  readonly scrolledIndexChange: Observable<number> = new Observable(
+      (observer: Observer<number>) => this._scrollStrategy.scrolledIndexChange.subscribe(
+          index => Promise.resolve().then(() => this.ngZone.run(() => observer.next(index)))));
 
   /** The element that wraps the rendered content. */
   @ViewChild('contentWrapper', {static: true}) _contentWrapper: ElementRef<HTMLElement>;
 
   /** A stream that emits whenever the rendered range changes. */
-  renderedRangeStream: Observable<ListRange> = this._renderedRangeSubject;
+  readonly renderedRangeStream: Observable<ListRange> = this._renderedRangeSubject;
 
   /**
    * The total size of all content (in pixels), including content that is not currently rendered.
diff --git a/src/cdk/stepper/stepper.ts b/src/cdk/stepper/stepper.ts
index 83841e032c27..11da582e11bd 100644
--- a/src/cdk/stepper/stepper.ts
+++ b/src/cdk/stepper/stepper.ts
@@ -241,7 +241,7 @@ export class CdkStep implements OnChanges {
 })
 export class CdkStepper implements AfterContentInit, AfterViewInit, OnDestroy {
   /** Emits when the component is destroyed. */
-  protected _destroyed = new Subject<void>();
+  protected readonly _destroyed = new Subject<void>();
 
   /** Used for managing keyboard focus. */
   private _keyManager: FocusKeyManager<FocusableOption>;
@@ -309,8 +309,7 @@ export class CdkStepper implements AfterContentInit, AfterViewInit, OnDestroy {
   }
 
   /** Event emitted when the selected step has changed. */
-  @Output()
-  selectionChange: EventEmitter<StepperSelectionEvent> = new EventEmitter<StepperSelectionEvent>();
+  @Output() readonly selectionChange = new EventEmitter<StepperSelectionEvent>();
 
   /** Used to track unique ID for each stepper component. */
   _groupId: number;
@@ -560,14 +559,14 @@ interface AbstractControlLike {
   pristine: boolean;
   root: AbstractControlLike;
   status: string;
-  statusChanges: Observable<any>;
+  readonly statusChanges: Observable<any>;
   touched: boolean;
   untouched: boolean;
   updateOn: any;
   valid: boolean;
   validator: ((control: any) => any) | null;
   value: any;
-  valueChanges: Observable<any>;
+  readonly valueChanges: Observable<any>;
   clearAsyncValidators(): void;
   clearValidators(): void;
   disable(opts?: any): void;
diff --git a/src/cdk/table/table.ts b/src/cdk/table/table.ts
index c0401b38a268..610c81b83dcd 100644
--- a/src/cdk/table/table.ts
+++ b/src/cdk/table/table.ts
@@ -230,7 +230,7 @@ export class CdkTable<T> implements AfterContentChecked, CollectionViewer, OnDes
   protected _data: readonly T[];
 
   /** Subject that emits when the component has been destroyed. */
-  private _onDestroy = new Subject<void>();
+  private readonly _onDestroy = new Subject<void>();
 
   /** List of the rendered rows as identified by their `RenderRow` object. */
   private _renderRows: RenderRow<T>[];
@@ -463,7 +463,7 @@ export class CdkTable<T> implements AfterContentChecked, CollectionViewer, OnDes
    *
    * @docs-private
    */
-  viewChange: BehaviorSubject<{start: number, end: number}> =
+  readonly viewChange =
       new BehaviorSubject<{start: number, end: number}>({start: 0, end: Number.MAX_VALUE});
 
   // Outlets in the table's template where the header, data rows, and footer will be inserted.
diff --git a/src/cdk/testing/private/mock-ng-zone.ts b/src/cdk/testing/private/mock-ng-zone.ts
index d8224512d10e..558563758f9f 100644
--- a/src/cdk/testing/private/mock-ng-zone.ts
+++ b/src/cdk/testing/private/mock-ng-zone.ts
@@ -18,7 +18,7 @@ import {EventEmitter, Injectable, NgZone} from '@angular/core';
  */
 @Injectable()
 export class MockNgZone extends NgZone {
-  onStable: EventEmitter<any> = new EventEmitter(false);
+  readonly onStable = new EventEmitter(false);
 
   constructor() {
     super({enableLongStackTrace: false});
diff --git a/src/cdk/testing/testbed/task-state-zone-interceptor.ts b/src/cdk/testing/testbed/task-state-zone-interceptor.ts
index 8a4ded589808..e1eb66068f35 100644
--- a/src/cdk/testing/testbed/task-state-zone-interceptor.ts
+++ b/src/cdk/testing/testbed/task-state-zone-interceptor.ts
@@ -31,7 +31,7 @@ type PatchedProxyZone = ProxyZone & {
  */
 export class TaskStateZoneInterceptor {
   /** Subject that can be used to emit a new state change. */
-  private _stateSubject: BehaviorSubject<TaskState> = new BehaviorSubject<TaskState>(
+  private readonly _stateSubject = new BehaviorSubject<TaskState>(
       this._lastState ? this._getTaskStateFromInternalZoneState(this._lastState) : {stable: true});
 
   /** Public observable that emits whenever the task state changes. */
diff --git a/src/cdk/text-field/autofill.ts b/src/cdk/text-field/autofill.ts
index 6d02f8f5dd4e..5d317c985281 100644
--- a/src/cdk/text-field/autofill.ts
+++ b/src/cdk/text-field/autofill.ts
@@ -32,7 +32,7 @@ export type AutofillEvent = {
 
 /** Used to track info about currently monitored elements. */
 type MonitoredElementInfo = {
-  subject: Subject<AutofillEvent>;
+  readonly subject: Subject<AutofillEvent>;
   unlisten: () => void;
 };
 
@@ -147,7 +147,7 @@ export class AutofillMonitor implements OnDestroy {
 })
 export class CdkAutofill implements OnDestroy, OnInit {
   /** Emits when the autofill state of the element changes. */
-  @Output() cdkAutofill: EventEmitter<AutofillEvent> = new EventEmitter<AutofillEvent>();
+  @Output() readonly cdkAutofill = new EventEmitter<AutofillEvent>();
 
   constructor(private _elementRef: ElementRef<HTMLElement>,
               private _autofillMonitor: AutofillMonitor) {}
diff --git a/src/cdk/tree/padding.ts b/src/cdk/tree/padding.ts
index 798d65bf8c3f..9c0e483694da 100644
--- a/src/cdk/tree/padding.ts
+++ b/src/cdk/tree/padding.ts
@@ -28,7 +28,7 @@ export class CdkTreeNodePadding<T, K = T> implements OnDestroy {
   private _currentPadding: string|null;
 
   /** Subject that emits when the component has been destroyed. */
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   /** CSS units used for the indentation value. */
   indentUnits = 'px';
diff --git a/src/cdk/tree/tree.spec.ts b/src/cdk/tree/tree.spec.ts
index 7d2d8341431e..f0c0dcdd6d30 100644
--- a/src/cdk/tree/tree.spec.ts
+++ b/src/cdk/tree/tree.spec.ts
@@ -37,7 +37,7 @@ describe('CdkTree', () => {
   let dataSource: FakeDataSource;
   let treeElement: HTMLElement;
   let tree: CdkTree<TestData>;
-  let dir: {value: Direction, change: EventEmitter<Direction>};
+  let dir: {value: Direction, readonly change: EventEmitter<Direction>};
 
   function configureCdkTreeTestingModule(declarations: Type<any>[]) {
     TestBed.configureTestingModule({
@@ -1066,7 +1066,7 @@ export class TestData {
   pizzaBase: string;
   level: number;
   children: TestData[];
-  observableChildren: BehaviorSubject<TestData[]>;
+  readonly observableChildren: BehaviorSubject<TestData[]>;
 
   constructor(pizzaTopping: string, pizzaCheese: string, pizzaBase: string, level: number = 1) {
     this.pizzaTopping = pizzaTopping;
diff --git a/src/cdk/tree/tree.ts b/src/cdk/tree/tree.ts
index 20f3e4de5728..9bbcf2e51565 100644
--- a/src/cdk/tree/tree.ts
+++ b/src/cdk/tree/tree.ts
@@ -71,7 +71,7 @@ import {coerceNumberProperty} from '@angular/cdk/coercion';
 })
 export class CdkTree<T, K = T> implements AfterContentChecked, CollectionViewer, OnDestroy, OnInit {
   /** Subject that emits when the component has been destroyed. */
-  private _onDestroy = new Subject<void>();
+  private readonly _onDestroy = new Subject<void>();
 
   /** Differ used to find the changes in the data provided by the data source. */
   private _dataDiffer: IterableDiffer<T>;
@@ -126,7 +126,7 @@ export class CdkTree<T, K = T> implements AfterContentChecked, CollectionViewer,
    * Stream containing the latest information on what rows are being displayed on screen.
    * Can be used by the data source to as a heuristic of what data should be provided.
    */
-  viewChange =
+  readonly viewChange =
     new BehaviorSubject<{start: number, end: number}>({start: 0, end: Number.MAX_VALUE});
 
   constructor(private _differs: IterableDiffers,
@@ -324,10 +324,10 @@ export class CdkTreeNode<T, K = T> implements DoCheck, FocusableOption, OnDestro
   static mostRecentTreeNode: CdkTreeNode<any> | null = null;
 
   /** Subject that emits when the component has been destroyed. */
-  protected _destroyed = new Subject<void>();
+  protected readonly _destroyed = new Subject<void>();
 
   /** Emits when the node's data has changed. */
-  _dataChanges = new Subject<void>();
+  readonly _dataChanges = new Subject<void>();
 
   private _parentNodeAriaLevel: number;
 
diff --git a/src/components-examples/cdk/scrolling/cdk-virtual-scroll-data-source/cdk-virtual-scroll-data-source-example.ts b/src/components-examples/cdk/scrolling/cdk-virtual-scroll-data-source/cdk-virtual-scroll-data-source-example.ts
index e53cac202053..88d9bef61b4d 100644
--- a/src/components-examples/cdk/scrolling/cdk-virtual-scroll-data-source/cdk-virtual-scroll-data-source-example.ts
+++ b/src/components-examples/cdk/scrolling/cdk-virtual-scroll-data-source/cdk-virtual-scroll-data-source-example.ts
@@ -18,8 +18,8 @@ export class MyDataSource extends DataSource<string | undefined> {
   private _pageSize = 100;
   private _cachedData = Array.from<string>({length: this._length});
   private _fetchedPages = new Set<number>();
-  private _dataStream = new BehaviorSubject<(string | undefined)[]>(this._cachedData);
-  private _subscription = new Subscription();
+  private readonly _dataStream = new BehaviorSubject<(string | undefined)[]>(this._cachedData);
+  private readonly _subscription = new Subscription();
 
   connect(collectionViewer: CollectionViewer): Observable<(string | undefined)[]> {
     this._subscription.add(collectionViewer.viewChange.subscribe(range => {
diff --git a/src/dev-app/datepicker/datepicker-demo.ts b/src/dev-app/datepicker/datepicker-demo.ts
index 35e79276cb28..5d29ecb5b01e 100644
--- a/src/dev-app/datepicker/datepicker-demo.ts
+++ b/src/dev-app/datepicker/datepicker-demo.ts
@@ -149,7 +149,7 @@ export class CustomRangeStrategy {}
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class CustomHeader<D> implements OnDestroy {
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   constructor(
       private _calendar: MatCalendar<D>, private _dateAdapter: DateAdapter<D>,
diff --git a/src/dev-app/virtual-scroll/virtual-scroll-demo.ts b/src/dev-app/virtual-scroll/virtual-scroll-demo.ts
index a5ef87c28d1b..c05cf69fbe6b 100644
--- a/src/dev-app/virtual-scroll/virtual-scroll-demo.ts
+++ b/src/dev-app/virtual-scroll/virtual-scroll-demo.ts
@@ -34,7 +34,7 @@ export class VirtualScrollDemo implements OnDestroy {
   decreasingSizeData = Array(10000).fill(0)
       .map((_, i) => (1 + Math.floor((10000 - i) / 1000)) * 20);
   randomData = Array(10000).fill(0).map(() => Math.round(Math.random() * 100));
-  observableData = new BehaviorSubject<number[]>([]);
+  readonly observableData = new BehaviorSubject<number[]>([]);
   states = [
     {name: 'Alabama', capital: 'Montgomery'},
     {name: 'Alaska', capital: 'Juneau'},
diff --git a/src/google-maps/google-map/google-map.ts b/src/google-maps/google-map/google-map.ts
index d4d1ba9f9fec..a881b2dcac41 100644
--- a/src/google-maps/google-map/google-map.ts
+++ b/src/google-maps/google-map/google-map.ts
@@ -105,127 +105,129 @@ export class GoogleMap implements OnChanges, OnInit, OnDestroy {
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.bounds_changed
    */
-  @Output()
-  boundsChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('bounds_changed');
+  @Output() readonly boundsChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('bounds_changed');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.center_changed
    */
-  @Output()
-  centerChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('center_changed');
+  @Output() readonly centerChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('center_changed');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.click
    */
-  @Output()
-  mapClick: Observable<google.maps.MapMouseEvent|google.maps.IconMouseEvent> = this._eventManager
-      .getLazyEmitter<google.maps.MapMouseEvent|google.maps.IconMouseEvent>('click');
+  @Output() readonly mapClick: Observable<google.maps.MapMouseEvent|google.maps.IconMouseEvent> =
+      this._eventManager
+          .getLazyEmitter<google.maps.MapMouseEvent|google.maps.IconMouseEvent>('click');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.dblclick
    */
-  @Output()
-  mapDblclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapDblclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dblclick');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.drag
    */
-  @Output() mapDrag: Observable<void> = this._eventManager.getLazyEmitter<void>('drag');
+  @Output() readonly mapDrag: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('drag');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.dragend
    */
-  @Output() mapDragend: Observable<void> = this._eventManager.getLazyEmitter<void>('dragend');
+  @Output() readonly mapDragend: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('dragend');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.dragstart
    */
-  @Output() mapDragstart: Observable<void> = this._eventManager.getLazyEmitter<void>('dragstart');
+  @Output() readonly mapDragstart: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('dragstart');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.heading_changed
    */
-  @Output()
-  headingChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('heading_changed');
+  @Output() readonly headingChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('heading_changed');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.idle
    */
-  @Output() idle: Observable<void> = this._eventManager.getLazyEmitter<void>('idle');
+  @Output() readonly idle: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('idle');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.maptypeid_changed
    */
-  @Output()
-  maptypeidChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('maptypeid_changed');
+  @Output() readonly maptypeidChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('maptypeid_changed');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.mousemove
    */
   @Output()
-  mapMousemove: Observable<google.maps.MapMouseEvent> =
+  readonly mapMousemove: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mousemove');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.mouseout
    */
-  @Output()
-  mapMouseout: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapMouseout: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseout');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.mouseover
    */
-  @Output()
-  mapMouseover: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapMouseover: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseover');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/map#Map.projection_changed
    */
-  @Output()
-  projectionChanged: Observable<void> =
+  @Output() readonly projectionChanged: Observable<void> =
       this._eventManager.getLazyEmitter<void>('projection_changed');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.rightclick
    */
-  @Output()
-  mapRightclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapRightclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('rightclick');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.tilesloaded
    */
-  @Output() tilesloaded: Observable<void> = this._eventManager.getLazyEmitter<void>('tilesloaded');
+  @Output() readonly tilesloaded: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('tilesloaded');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.tilt_changed
    */
-  @Output() tiltChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('tilt_changed');
+  @Output() readonly tiltChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('tilt_changed');
 
   /**
    * See
    * https://developers.google.com/maps/documentation/javascript/reference/map#Map.zoom_changed
    */
-  @Output() zoomChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('zoom_changed');
+  @Output() readonly zoomChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('zoom_changed');
 
   constructor(
     private readonly _elementRef: ElementRef,
diff --git a/src/google-maps/map-circle/map-circle.ts b/src/google-maps/map-circle/map-circle.ts
index 97ec21df04be..78a3de30f423 100644
--- a/src/google-maps/map-circle/map-circle.ts
+++ b/src/google-maps/map-circle/map-circle.ts
@@ -59,102 +59,91 @@ export class MapCircle implements OnInit, OnDestroy {
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.center_changed
    */
-  @Output()
-  centerChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('center_changed');
+  @Output() readonly centerChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('center_changed');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.click
    */
-  @Output()
-  circleClick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleClick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('click');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.dblclick
    */
-  @Output()
-  circleDblclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleDblclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dblclick');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.drag
    */
-  @Output()
-  circleDrag: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleDrag: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('drag');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.dragend
    */
-  @Output()
-  circleDragend: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleDragend: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragend');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.dragstart
    */
-  @Output()
-  circleDragstart: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleDragstart: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragstart');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.mousedown
    */
-  @Output()
-  circleMousedown: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleMousedown: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mousedown');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.mousemove
    */
-  @Output()
-  circleMousemove: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleMousemove: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mousemove');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.mouseout
    */
-  @Output()
-  circleMouseout: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleMouseout: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseout');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.mouseover
    */
-  @Output()
-  circleMouseover: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleMouseover: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseover');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.mouseup
    */
-  @Output()
-  circleMouseup: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleMouseup: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseup');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.radius_changed
    */
-  @Output()
-  radiusChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('radius_changed');
+  @Output() readonly radiusChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('radius_changed');
 
   /**
    * @see
    * developers.google.com/maps/documentation/javascript/reference/polygon#Circle.rightclick
    */
-  @Output()
-  circleRightclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly circleRightclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('rightclick');
 
   constructor(private readonly _map: GoogleMap, private readonly _ngZone: NgZone) {}
diff --git a/src/google-maps/map-directions-renderer/map-directions-renderer.ts b/src/google-maps/map-directions-renderer/map-directions-renderer.ts
index 0501118ce0ec..99111b3486d0 100644
--- a/src/google-maps/map-directions-renderer/map-directions-renderer.ts
+++ b/src/google-maps/map-directions-renderer/map-directions-renderer.ts
@@ -61,7 +61,7 @@ export class MapDirectionsRenderer implements OnInit, OnChanges, OnDestroy {
    * #DirectionsRenderer.directions_changed
    */
   @Output()
-  directionsChanged: Observable<void> =
+  readonly directionsChanged: Observable<void> =
       this._eventManager.getLazyEmitter<void>('directions_changed');
 
   /** The underlying google.maps.DirectionsRenderer object. */
diff --git a/src/google-maps/map-ground-overlay/map-ground-overlay.ts b/src/google-maps/map-ground-overlay/map-ground-overlay.ts
index 9cfbe20cfcbd..5c8afcb79843 100644
--- a/src/google-maps/map-ground-overlay/map-ground-overlay.ts
+++ b/src/google-maps/map-ground-overlay/map-ground-overlay.ts
@@ -70,8 +70,7 @@ export class MapGroundOverlay implements OnInit, OnDestroy {
    * See
    * developers.google.com/maps/documentation/javascript/reference/image-overlay#GroundOverlay.click
    */
-  @Output()
-  mapClick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapClick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('click');
 
   /**
@@ -79,8 +78,7 @@ export class MapGroundOverlay implements OnInit, OnDestroy {
    * developers.google.com/maps/documentation/javascript/reference/image-overlay
    * #GroundOverlay.dblclick
    */
-  @Output()
-  mapDblclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapDblclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dblclick');
 
   constructor(private readonly _map: GoogleMap, private readonly _ngZone: NgZone) {}
diff --git a/src/google-maps/map-info-window/map-info-window.ts b/src/google-maps/map-info-window/map-info-window.ts
index 50bd4397c7ce..b69ffba2d83f 100644
--- a/src/google-maps/map-info-window/map-info-window.ts
+++ b/src/google-maps/map-info-window/map-info-window.ts
@@ -63,37 +63,39 @@ export class MapInfoWindow implements OnInit, OnDestroy {
    * See
    * developers.google.com/maps/documentation/javascript/reference/info-window#InfoWindow.closeclick
    */
-  @Output() closeclick: Observable<void> = this._eventManager.getLazyEmitter<void>('closeclick');
+  @Output() readonly closeclick: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('closeclick');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/info-window
    * #InfoWindow.content_changed
    */
-  @Output()
-  contentChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('content_changed');
+  @Output() readonly contentChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('content_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/info-window#InfoWindow.domready
    */
-  @Output() domready: Observable<void> = this._eventManager.getLazyEmitter<void>('domready');
+  @Output() readonly domready: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('domready');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/info-window
    * #InfoWindow.position_changed
    */
-  @Output()
-  positionChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('position_changed');
+  @Output() readonly positionChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('position_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/info-window
    * #InfoWindow.zindex_changed
    */
-  @Output()
-  zindexChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('zindex_changed');
+  @Output() readonly zindexChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('zindex_changed');
 
   constructor(private readonly _googleMap: GoogleMap,
               private _elementRef: ElementRef<HTMLElement>,
diff --git a/src/google-maps/map-kml-layer/map-kml-layer.ts b/src/google-maps/map-kml-layer/map-kml-layer.ts
index 32cf1c820924..4b01a831e178 100644
--- a/src/google-maps/map-kml-layer/map-kml-layer.ts
+++ b/src/google-maps/map-kml-layer/map-kml-layer.ts
@@ -59,8 +59,7 @@ export class MapKmlLayer implements OnInit, OnDestroy {
   /**
    * See developers.google.com/maps/documentation/javascript/reference/kml#KmlLayer.click
    */
-  @Output()
-  kmlClick: Observable<google.maps.KmlMouseEvent> =
+  @Output() readonly kmlClick: Observable<google.maps.KmlMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.KmlMouseEvent>('click');
 
   /**
@@ -68,15 +67,14 @@ export class MapKmlLayer implements OnInit, OnDestroy {
    * developers.google.com/maps/documentation/javascript/reference/kml
    * #KmlLayer.defaultviewport_changed
    */
-  @Output()
-  defaultviewportChanged: Observable<void> =
+  @Output() readonly defaultviewportChanged: Observable<void> =
       this._eventManager.getLazyEmitter<void>('defaultviewport_changed');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/kml#KmlLayer.status_changed
    */
-  @Output()
-  statusChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('status_changed');
+  @Output() readonly statusChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('status_changed');
 
   constructor(private readonly _map: GoogleMap, private _ngZone: NgZone) {}
 
diff --git a/src/google-maps/map-marker-clusterer/map-marker-clusterer.ts b/src/google-maps/map-marker-clusterer/map-marker-clusterer.ts
index 98498bec79dd..f8f8d85bee49 100644
--- a/src/google-maps/map-marker-clusterer/map-marker-clusterer.ts
+++ b/src/google-maps/map-marker-clusterer/map-marker-clusterer.ts
@@ -167,19 +167,19 @@ export class MapMarkerClusterer implements OnInit, AfterContentInit, OnChanges,
    * googlemaps.github.io/v3-utility-library/modules/
    * _google_markerclustererplus.html#clusteringbegin
    */
-  @Output()
-  clusteringbegin: Observable<void> = this._eventManager.getLazyEmitter<void>('clusteringbegin');
+  @Output() readonly clusteringbegin: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('clusteringbegin');
 
   /**
    * See
    * googlemaps.github.io/v3-utility-library/modules/_google_markerclustererplus.html#clusteringend
    */
-  @Output()
-  clusteringend: Observable<void> = this._eventManager.getLazyEmitter<void>('clusteringend');
+  @Output() readonly clusteringend: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('clusteringend');
 
   /** Emits when a cluster has been clicked. */
   @Output()
-  clusterClick: Observable<Cluster> = this._eventManager.getLazyEmitter<Cluster>('click');
+  readonly clusterClick: Observable<Cluster> = this._eventManager.getLazyEmitter<Cluster>('click');
 
   @ContentChildren(MapMarker, {descendants: true}) _markers: QueryList<MapMarker>;
 
diff --git a/src/google-maps/map-marker/map-marker.ts b/src/google-maps/map-marker/map-marker.ts
index 80e61ef58ae3..cc63a2befc4a 100644
--- a/src/google-maps/map-marker/map-marker.ts
+++ b/src/google-maps/map-marker/map-marker.ts
@@ -109,156 +109,148 @@ export class MapMarker implements OnInit, OnChanges, OnDestroy, MapAnchorPoint {
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.animation_changed
    */
-  @Output()
-  animationChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('animation_changed');
+  @Output() readonly animationChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('animation_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.click
    */
-  @Output()
-  mapClick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapClick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('click');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.clickable_changed
    */
-  @Output()
-  clickableChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('clickable_changed');
+  @Output() readonly clickableChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('clickable_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.cursor_changed
    */
-  @Output()
-  cursorChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('cursor_changed');
+  @Output() readonly cursorChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('cursor_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.dblclick
    */
-  @Output()
-  mapDblclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapDblclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dblclick');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.drag
    */
-  @Output()
-  mapDrag: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapDrag: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('drag');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.dragend
    */
-  @Output()
-  mapDragend: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapDragend: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragend');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.draggable_changed
    */
-  @Output()
-  draggableChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('draggable_changed');
+  @Output() readonly draggableChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('draggable_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.dragstart
    */
-  @Output()
-  mapDragstart: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapDragstart: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragstart');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.flat_changed
    */
-  @Output() flatChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('flat_changed');
+  @Output() readonly flatChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('flat_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.icon_changed
    */
-  @Output() iconChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('icon_changed');
+  @Output() readonly iconChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('icon_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.mousedown
    */
-  @Output()
-  mapMousedown: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapMousedown: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mousedown');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.mouseout
    */
-  @Output()
-  mapMouseout: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapMouseout: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseout');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.mouseover
    */
-  @Output()
-  mapMouseover: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapMouseover: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseover');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.mouseup
    */
-  @Output()
-  mapMouseup: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapMouseup: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseup');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.position_changed
    */
-  @Output()
-  positionChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('position_changed');
+  @Output() readonly positionChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('position_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.rightclick
    */
-  @Output()
-  mapRightclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly mapRightclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('rightclick');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.shape_changed
    */
-  @Output() shapeChanged:
-  Observable<void> = this._eventManager.getLazyEmitter<void>('shape_changed');
+  @Output() readonly shapeChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('shape_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.title_changed
    */
-  @Output()
-  titleChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('title_changed');
+  @Output() readonly titleChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('title_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.visible_changed
    */
-  @Output()
-  visibleChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('visible_changed');
+  @Output() readonly visibleChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('visible_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/marker#Marker.zindex_changed
    */
-  @Output()
-  zindexChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('zindex_changed');
+  @Output() readonly zindexChanged: Observable<void> =
+      this._eventManager.getLazyEmitter<void>('zindex_changed');
 
   /**
    * The underlying google.maps.Marker object.
diff --git a/src/google-maps/map-polygon/map-polygon.ts b/src/google-maps/map-polygon/map-polygon.ts
index 9e92ac267923..47d09fb7dd96 100644
--- a/src/google-maps/map-polygon/map-polygon.ts
+++ b/src/google-maps/map-polygon/map-polygon.ts
@@ -64,78 +64,67 @@ export class MapPolygon implements OnInit, OnDestroy {
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.click
    */
-  @Output()
-  polygonClick: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonClick: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('click');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.dblclick
    */
-  @Output()
-  polygonDblclick: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonDblclick: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('dblclick');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.drag
    */
-  @Output()
-  polygonDrag: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly polygonDrag: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('drag');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.dragend
    */
-  @Output()
-  polygonDragend: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly polygonDragend: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragend');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.dragstart
    */
-  @Output()
-  polygonDragstart: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly polygonDragstart: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragstart');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.mousedown
    */
-  @Output()
-  polygonMousedown: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonMousedown: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mousedown');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.mousemove
    */
-  @Output()
-  polygonMousemove: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonMousemove: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mousemove');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.mouseout
    */
-  @Output()
-  polygonMouseout: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonMouseout: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mouseout');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.mouseover
    */
-  @Output()
-  polygonMouseover: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonMouseover: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mouseover');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.mouseup
    */
-  @Output()
-  polygonMouseup: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonMouseup: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mouseup');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polygon.rightclick
    */
-  @Output()
-  polygonRightclick: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polygonRightclick: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('rightclick');
 
   constructor(private readonly _map: GoogleMap, private readonly _ngZone: NgZone) {}
diff --git a/src/google-maps/map-polyline/map-polyline.ts b/src/google-maps/map-polyline/map-polyline.ts
index a8ad619f1300..ed4d6a0196fc 100644
--- a/src/google-maps/map-polyline/map-polyline.ts
+++ b/src/google-maps/map-polyline/map-polyline.ts
@@ -62,78 +62,67 @@ export class MapPolyline implements OnInit, OnDestroy {
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.click
    */
-  @Output()
-  polylineClick: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineClick: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('click');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.dblclick
    */
-  @Output()
-  polylineDblclick: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineDblclick: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('dblclick');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.drag
    */
-  @Output()
-  polylineDrag: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly polylineDrag: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('drag');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.dragend
    */
-  @Output()
-  polylineDragend: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly polylineDragend: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragend');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.dragstart
    */
-  @Output()
-  polylineDragstart: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly polylineDragstart: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragstart');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.mousedown
    */
-  @Output()
-  polylineMousedown: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineMousedown: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mousedown');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.mousemove
    */
-  @Output()
-  polylineMousemove: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineMousemove: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mousemove');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.mouseout
    */
-  @Output()
-  polylineMouseout: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineMouseout: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mouseout');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.mouseover
    */
-  @Output()
-  polylineMouseover: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineMouseover: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mouseover');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.mouseup
    */
-  @Output()
-  polylineMouseup: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineMouseup: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('mouseup');
 
   /**
    * See developers.google.com/maps/documentation/javascript/reference/polygon#Polyline.rightclick
    */
-  @Output()
-  polylineRightclick: Observable<google.maps.PolyMouseEvent> =
+  @Output() readonly polylineRightclick: Observable<google.maps.PolyMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.PolyMouseEvent>('rightclick');
 
   constructor(
diff --git a/src/google-maps/map-rectangle/map-rectangle.ts b/src/google-maps/map-rectangle/map-rectangle.ts
index 5638f19cdac0..48b9bdc858b9 100644
--- a/src/google-maps/map-rectangle/map-rectangle.ts
+++ b/src/google-maps/map-rectangle/map-rectangle.ts
@@ -54,96 +54,84 @@ export class MapRectangle implements OnInit, OnDestroy {
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.boundsChanged
-   */
-  @Output()
-  boundsChanged: Observable<void> = this._eventManager.getLazyEmitter<void>('bounds_changed');
+   */ @Output() readonly boundsChanged: Observable<void> =
+    this._eventManager.getLazyEmitter<void>('bounds_changed');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.click
    */
-  @Output()
-  rectangleClick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleClick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('click');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.dblclick
    */
-  @Output()
-  rectangleDblclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleDblclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dblclick');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.drag
    */
-  @Output()
-  rectangleDrag: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleDrag: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('drag');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.dragend
    */
-  @Output()
-  rectangleDragend: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleDragend: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragend');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.dragstart
    */
-  @Output()
-  rectangleDragstart: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleDragstart: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('dragstart');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.mousedown
    */
-  @Output()
-  rectangleMousedown: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleMousedown: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mousedown');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.mousemove
    */
-  @Output()
-  rectangleMousemove: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleMousemove: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mousemove');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.mouseout
    */
-  @Output()
-  rectangleMouseout: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleMouseout: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseout');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.mouseover
    */
-  @Output()
-  rectangleMouseover: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleMouseover: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseover');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.mouseup
    */
-  @Output()
-  rectangleMouseup: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleMouseup: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('mouseup');
 
   /**
    * See
    * developers.google.com/maps/documentation/javascript/reference/polygon#Rectangle.rightclick
    */
-  @Output()
-  rectangleRightclick: Observable<google.maps.MapMouseEvent> =
+  @Output() readonly rectangleRightclick: Observable<google.maps.MapMouseEvent> =
       this._eventManager.getLazyEmitter<google.maps.MapMouseEvent>('rightclick');
 
   constructor(private readonly _map: GoogleMap, private readonly _ngZone: NgZone) {}
diff --git a/src/material-experimental/mdc-chips/chip-icons.ts b/src/material-experimental/mdc-chips/chip-icons.ts
index 029f67a5c521..03475292719c 100644
--- a/src/material-experimental/mdc-chips/chip-icons.ts
+++ b/src/material-experimental/mdc-chips/chip-icons.ts
@@ -185,7 +185,7 @@ export class MatChipRemove extends _MatChipRemoveMixinBase implements CanDisable
    * Emits when the user interacts with the icon.
    * @docs-private
    */
-  interaction: Subject<MouseEvent | KeyboardEvent> = new Subject<MouseEvent | KeyboardEvent>();
+  readonly interaction = new Subject<MouseEvent | KeyboardEvent>();
 
   constructor(elementRef: ElementRef) {
     super(elementRef);
diff --git a/src/material-experimental/mdc-chips/chip-input.ts b/src/material-experimental/mdc-chips/chip-input.ts
index 489ec4e85dca..652f926f0714 100644
--- a/src/material-experimental/mdc-chips/chip-input.ts
+++ b/src/material-experimental/mdc-chips/chip-input.ts
@@ -105,7 +105,7 @@ export class MatChipInput implements MatChipTextControl, AfterContentInit, OnCha
 
   /** Emitted when a chip is to be added. */
   @Output('matChipInputTokenEnd')
-  chipEnd: EventEmitter<MatChipInputEvent> = new EventEmitter<MatChipInputEvent>();
+  readonly chipEnd: EventEmitter<MatChipInputEvent> = new EventEmitter<MatChipInputEvent>();
 
   /** The input's placeholder text. */
   @Input() placeholder: string = '';
diff --git a/src/material-experimental/mdc-chips/chip.ts b/src/material-experimental/mdc-chips/chip.ts
index 74c5e78e9920..7286127981eb 100644
--- a/src/material-experimental/mdc-chips/chip.ts
+++ b/src/material-experimental/mdc-chips/chip.ts
@@ -214,7 +214,7 @@ export class MatChip extends _MatChipMixinBase implements AfterContentInit, Afte
   protected _highlighted: boolean = false;
 
   /** Emitted when the user interacts with the chip. */
-  @Output() interaction = new EventEmitter<string>();
+  @Output() readonly interaction = new EventEmitter<string>();
 
   /** Emitted when the chip is destroyed. */
   @Output() readonly destroyed: EventEmitter<MatChipEvent> = new EventEmitter<MatChipEvent>();
diff --git a/src/material-experimental/mdc-menu/menu.spec.ts b/src/material-experimental/mdc-menu/menu.spec.ts
index 6705bfbc63b9..2a6aa5200c3a 100644
--- a/src/material-experimental/mdc-menu/menu.spec.ts
+++ b/src/material-experimental/mdc-menu/menu.spec.ts
@@ -2402,7 +2402,7 @@ class CustomMenuPanel implements MatMenuPanel {
   parentMenu: MatMenuPanel;
 
   @ViewChild(TemplateRef) templateRef: TemplateRef<any>;
-  @Output() close = new EventEmitter<void | 'click' | 'keydown' | 'tab'>();
+  @Output() readonly close = new EventEmitter<void|'click'|'keydown'|'tab'>();
   focusFirstItem = () => {};
   resetActiveItem = () => {};
   setPositionClasses = () => {};
diff --git a/src/material-experimental/mdc-progress-bar/progress-bar.ts b/src/material-experimental/mdc-progress-bar/progress-bar.ts
index 8d3aafa00666..4cb1fe20b0bc 100644
--- a/src/material-experimental/mdc-progress-bar/progress-bar.ts
+++ b/src/material-experimental/mdc-progress-bar/progress-bar.ts
@@ -153,7 +153,7 @@ export class MatProgressBar extends _MatProgressBarMixinBase implements AfterVie
    * be emitted when animations are disabled, nor will it be emitted for modes with continuous
    * animations (indeterminate and query).
    */
-  @Output() animationEnd = new EventEmitter<ProgressAnimationEnd>();
+  @Output() readonly animationEnd = new EventEmitter<ProgressAnimationEnd>();
 
   /** Reference to animation end subscription to be unsubscribed on destroy. */
   private _animationEndSubscription = Subscription.EMPTY;
diff --git a/src/material-experimental/mdc-slider/slider.spec.ts b/src/material-experimental/mdc-slider/slider.spec.ts
index 7eff9b5783bf..0d0398232c4a 100644
--- a/src/material-experimental/mdc-slider/slider.spec.ts
+++ b/src/material-experimental/mdc-slider/slider.spec.ts
@@ -79,7 +79,7 @@ xdescribe('MDC-based MatSlider', () => {
     });
 
     // TODO(devversion): MDC slider updates values with right mouse button.
-    // tslint:disable-next-line
+    // tslint:disable-next-line:ban
     xit('should not update when pressing the right mouse button', () => {
       expect(sliderInstance.value).toBe(0);
 
@@ -386,7 +386,7 @@ xdescribe('MDC-based MatSlider', () => {
     });
 
     // TODO(devversion): MDC slider does not support decimal steps.
-    // tslint:disable-next-line
+    // tslint:disable-next-line:ban
     xit('should truncate long decimal values when using a decimal step and the arrow keys', () => {
       fixture.componentInstance.step = 0.1;
       fixture.detectChanges();
@@ -514,7 +514,7 @@ xdescribe('MDC-based MatSlider', () => {
     });
 
     // TODO(devversion): MDC does not refresh value pin if value changes programmatically.
-    // tslint:disable-next-line
+    // tslint:disable-next-line:ban
     xit('should format the thumb label based on the passed-in `displayWith` function if value ' +
         'is updated through binding', () => {
       fixture.componentInstance.value = 200000;
@@ -675,7 +675,7 @@ xdescribe('MDC-based MatSlider', () => {
 
     // TODO(devversion): MDC slider always emits change event on mouseup (regardless of value)
     // Bug tracked with: https://github.com/material-components/material-components-web/issues/5018
-    // tslint:disable-next-line
+    // tslint:disable-next-line:ban
     xit('should not emit multiple changes for same value', () => {
       expect(testComponent.onChange).not.toHaveBeenCalled();
 
@@ -928,7 +928,7 @@ xdescribe('MDC-based MatSlider', () => {
     });
 
     // TODO: MDC slider does not respect modifier keys.
-    // tslint:disable-next-line
+    // tslint:disable-next-line:ban
     xit('should ignore events modifier keys', () => {
       sliderInstance.value = 0;
 
diff --git a/src/material-experimental/selection/selection.ts b/src/material-experimental/selection/selection.ts
index 0f8375d901e7..c0faac0aac79 100644
--- a/src/material-experimental/selection/selection.ts
+++ b/src/material-experimental/selection/selection.ts
@@ -30,7 +30,7 @@ export class MatSelection<T> extends CdkSelection<T> {
   set multiple(multiple: boolean) { this._multiple = coerceBooleanProperty(multiple); }
 
   /** Emits when selection changes. */
-  @Output('matSelectionChange') change = new EventEmitter<SelectionChange<T>>();
+  @Output('matSelectionChange') readonly change = new EventEmitter<SelectionChange<T>>();
 }
 
 /**
diff --git a/src/material/chips/chip-input.ts b/src/material/chips/chip-input.ts
index 61b42772e313..a11feab6eb95 100644
--- a/src/material/chips/chip-input.ts
+++ b/src/material/chips/chip-input.ts
@@ -101,8 +101,7 @@ export class MatChipInput implements MatChipTextControl, OnChanges, OnDestroy, A
       this._defaultOptions.separatorKeyCodes;
 
   /** Emitted when a chip is to be added. */
-  @Output('matChipInputTokenEnd')
-  chipEnd: EventEmitter<MatChipInputEvent> = new EventEmitter<MatChipInputEvent>();
+  @Output('matChipInputTokenEnd') readonly chipEnd = new EventEmitter<MatChipInputEvent>();
 
   /** The input's placeholder text. */
   @Input() placeholder: string = '';
diff --git a/src/material/chips/chip-list.ts b/src/material/chips/chip-list.ts
index ed88cf512121..33ef855907c5 100644
--- a/src/material/chips/chip-list.ts
+++ b/src/material/chips/chip-list.ts
@@ -112,7 +112,7 @@ export class MatChipList extends _MatChipListMixinBase implements MatFormFieldCo
   private _lastDestroyedChipIndex: number | null = null;
 
   /** Subject that emits when the component has been destroyed. */
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   /** Subscription to focus changes in the chips. */
   private _chipFocusSubscription: Subscription | null;
@@ -313,15 +313,14 @@ export class MatChipList extends _MatChipListMixinBase implements MatFormFieldCo
   }
 
   /** Event emitted when the selected chip list value has been changed by the user. */
-  @Output() readonly change: EventEmitter<MatChipListChange> =
-      new EventEmitter<MatChipListChange>();
+  @Output() readonly change = new EventEmitter<MatChipListChange>();
 
   /**
    * Event that emits whenever the raw value of the chip-list changes. This is here primarily
    * to facilitate the two-way binding for the `value` input.
    * @docs-private
    */
-  @Output() readonly valueChange: EventEmitter<any> = new EventEmitter<any>();
+  @Output() readonly valueChange = new EventEmitter<any>();
 
   /** The chip components contained within this chip list. */
   @ContentChildren(MatChip, {
diff --git a/src/material/core/datetime/date-adapter.ts b/src/material/core/datetime/date-adapter.ts
index cba0e71ba6ed..995cb9a7a34b 100644
--- a/src/material/core/datetime/date-adapter.ts
+++ b/src/material/core/datetime/date-adapter.ts
@@ -24,7 +24,7 @@ export function MAT_DATE_LOCALE_FACTORY(): string {
 export abstract class DateAdapter<D> {
   /** The locale to use for all dates. */
   protected locale: any;
-  protected _localeChanges = new Subject<void>();
+  protected readonly _localeChanges = new Subject<void>();
 
   /** A stream that emits when the locale changes. */
   readonly localeChanges: Observable<void> = this._localeChanges;
diff --git a/src/material/datepicker/calendar-body.ts b/src/material/datepicker/calendar-body.ts
index bcf7de3651cd..df7ce929666d 100644
--- a/src/material/datepicker/calendar-body.ts
+++ b/src/material/datepicker/calendar-body.ts
@@ -118,11 +118,11 @@ export class MatCalendarBody implements OnChanges, OnDestroy {
   @Input() previewEnd: number | null = null;
 
   /** Emits when a new value is selected. */
-  @Output() readonly selectedValueChange: EventEmitter<MatCalendarUserEvent<number>> =
-      new EventEmitter<MatCalendarUserEvent<number>>();
+  @Output() readonly selectedValueChange = new EventEmitter<MatCalendarUserEvent<number>>();
 
   /** Emits when the preview has changed as a result of a user action. */
-  @Output() previewChange = new EventEmitter<MatCalendarUserEvent<MatCalendarCell | null>>();
+  @Output() readonly previewChange =
+    new EventEmitter<MatCalendarUserEvent<MatCalendarCell | null>>();
 
   /** The number of blank cells to put at the beginning for the first row. */
   _firstRowOffset: number;
diff --git a/src/material/datepicker/calendar.ts b/src/material/datepicker/calendar.ts
index 2724cfabe834..31aba8d88cfc 100644
--- a/src/material/datepicker/calendar.ts
+++ b/src/material/datepicker/calendar.ts
@@ -320,7 +320,7 @@ export class MatCalendar<D> implements AfterContentInit, AfterViewChecked, OnDes
   /**
    * Emits whenever there is a state change that the header may need to respond to.
    */
-  stateChanges = new Subject<void>();
+  readonly stateChanges = new Subject<void>();
 
   constructor(_intl: MatDatepickerIntl,
               @Optional() private _dateAdapter: DateAdapter<D>,
diff --git a/src/material/datepicker/date-range-input.ts b/src/material/datepicker/date-range-input.ts
index 75fac3df4bef..559a9251f58c 100644
--- a/src/material/datepicker/date-range-input.ts
+++ b/src/material/datepicker/date-range-input.ts
@@ -230,7 +230,7 @@ export class MatDateRangeInput<D> implements MatFormFieldControl<DateRange<D>>,
   ngControl: NgControl | null;
 
   /** Emits when the input's state has changed. */
-  stateChanges = new Subject<void>();
+  readonly stateChanges = new Subject<void>();
 
   constructor(
     private _changeDetectorRef: ChangeDetectorRef,
diff --git a/src/material/datepicker/date-selection-model.ts b/src/material/datepicker/date-selection-model.ts
index 4b4937b7fa42..637213b10d99 100644
--- a/src/material/datepicker/date-selection-model.ts
+++ b/src/material/datepicker/date-selection-model.ts
@@ -51,7 +51,7 @@ export interface DateSelectionModelChange<S> {
 @Injectable()
 export abstract class MatDateSelectionModel<S, D = ExtractDateTypeFromSelection<S>>
     implements OnDestroy {
-  private _selectionChanged = new Subject<DateSelectionModelChange<S>>();
+  private readonly _selectionChanged = new Subject<DateSelectionModelChange<S>>();
 
   /** Emits when the selection has changed. */
   selectionChanged: Observable<DateSelectionModelChange<S>> = this._selectionChanged;
diff --git a/src/material/datepicker/datepicker-base.ts b/src/material/datepicker/datepicker-base.ts
index 61e2c3002bc0..012101e95b41 100644
--- a/src/material/datepicker/datepicker-base.ts
+++ b/src/material/datepicker/datepicker-base.ts
@@ -150,7 +150,7 @@ export class MatDatepickerContent<S, D = ExtractDateTypeFromSelection<S>>
   _animationState: 'enter' | 'void' = 'enter';
 
   /** Emits when an animation has finished. */
-  _animationDone = new Subject<void>();
+  readonly _animationDone = new Subject<void>();
 
   /** Text for the close button. */
   _closeButtonText: string;
@@ -377,10 +377,10 @@ export abstract class MatDatepickerBase<C extends MatDatepickerControl<D>, S,
   @Input() dateClass: MatCalendarCellClassFunction<D>;
 
   /** Emits when the datepicker has been opened. */
-  @Output('opened') openedStream: EventEmitter<void> = new EventEmitter<void>();
+  @Output('opened') readonly openedStream = new EventEmitter<void>();
 
   /** Emits when the datepicker has been closed. */
-  @Output('closed') closedStream: EventEmitter<void> = new EventEmitter<void>();
+  @Output('closed') readonly closedStream = new EventEmitter<void>();
 
   /**
    * Classes to be passed to the date picker panel.
diff --git a/src/material/datepicker/datepicker-input-base.ts b/src/material/datepicker/datepicker-input-base.ts
index 818f42b51eaf..915afbd6713b 100644
--- a/src/material/datepicker/datepicker-input-base.ts
+++ b/src/material/datepicker/datepicker-input-base.ts
@@ -114,7 +114,7 @@ export abstract class MatDatepickerInputBase<S, D = ExtractDateTypeFromSelection
       new EventEmitter<MatDatepickerInputEvent<D, S>>();
 
   /** Emits when the internal state has changed */
-  stateChanges = new Subject<void>();
+  readonly stateChanges = new Subject<void>();
 
   _onTouched = () => {};
   _validatorOnChange = () => {};
diff --git a/src/material/expansion/expansion-panel.ts b/src/material/expansion/expansion-panel.ts
index 430946d46813..0e71ec9ef257 100644
--- a/src/material/expansion/expansion-panel.ts
+++ b/src/material/expansion/expansion-panel.ts
@@ -120,10 +120,10 @@ export class MatExpansionPanel extends CdkAccordionItem implements AfterContentI
   }
 
   /** An event emitted after the body's expansion animation happens. */
-  @Output() afterExpand = new EventEmitter<void>();
+  @Output() readonly afterExpand = new EventEmitter<void>();
 
   /** An event emitted after the body's collapse animation happens. */
-  @Output() afterCollapse = new EventEmitter<void>();
+  @Output() readonly afterCollapse = new EventEmitter<void>();
 
   /** Stream that emits for changes in `@Input` properties. */
   readonly _inputChanges = new Subject<SimpleChanges>();
@@ -144,7 +144,7 @@ export class MatExpansionPanel extends CdkAccordionItem implements AfterContentI
   _headerId = `mat-expansion-panel-header-${uniqueId++}`;
 
   /** Stream of body animation done events. */
-  _bodyAnimationDone = new Subject<AnimationEvent>();
+  readonly _bodyAnimationDone = new Subject<AnimationEvent>();
 
   constructor(@Optional() @SkipSelf() @Inject(MAT_ACCORDION) accordion: MatAccordionBase,
               _changeDetectorRef: ChangeDetectorRef,
diff --git a/src/material/form-field/form-field.ts b/src/material/form-field/form-field.ts
index 9b2eae680bbe..126a92a400a2 100644
--- a/src/material/form-field/form-field.ts
+++ b/src/material/form-field/form-field.ts
@@ -168,7 +168,7 @@ export class MatFormField extends _MatFormFieldMixinBase
   /** Whether the outline gap needs to be calculated next time the zone has stabilized. */
   private _outlineGapCalculationNeededOnStable = false;
 
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   /** The form-field appearance style. */
   @Input()
diff --git a/src/material/list/list.ts b/src/material/list/list.ts
index 45bd8538687e..244772eba225 100644
--- a/src/material/list/list.ts
+++ b/src/material/list/list.ts
@@ -81,7 +81,7 @@ export const MAT_NAV_LIST = new InjectionToken<MatNavList>('MatNavList');
 export class MatNavList extends _MatListMixinBase implements CanDisable, CanDisableRipple,
   OnChanges, OnDestroy {
   /** Emits when the state of the list changes. */
-  _stateChanges = new Subject<void>();
+  readonly _stateChanges = new Subject<void>();
 
   ngOnChanges() {
     this._stateChanges.next();
@@ -111,7 +111,7 @@ export class MatNavList extends _MatListMixinBase implements CanDisable, CanDisa
 export class MatList extends _MatListMixinBase implements CanDisable, CanDisableRipple, OnChanges,
   OnDestroy {
   /** Emits when the state of the list changes. */
-  _stateChanges = new Subject<void>();
+  readonly _stateChanges = new Subject<void>();
 
   constructor(private _elementRef: ElementRef<HTMLElement>) {
     super();
@@ -197,7 +197,7 @@ export class MatListItem extends _MatListItemMixinBase implements AfterContentIn
     CanDisableRipple, OnDestroy {
   private _isInteractiveList: boolean = false;
   private _list?: MatNavList | MatList;
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   @ContentChildren(MatLine, {descendants: true}) _lines: QueryList<MatLine>;
   @ContentChild(MatListAvatarCssMatStyler) _avatar: MatListAvatarCssMatStyler;
diff --git a/src/material/list/selection-list.ts b/src/material/list/selection-list.ts
index 58fd6dae486f..e01d15ae6c1b 100644
--- a/src/material/list/selection-list.ts
+++ b/src/material/list/selection-list.ts
@@ -418,7 +418,7 @@ export class MatSelectionList extends _MatSelectionListMixinBase implements CanD
   _value: string[]|null;
 
   /** Emits when the list has been destroyed. */
-  private _destroyed = new Subject<void>();
+  private readonly _destroyed = new Subject<void>();
 
   /** View to model callback that should be called if the list or its options lost focus. */
   _onTouched: () => void = () => {};
diff --git a/src/material/menu/menu-content.ts b/src/material/menu/menu-content.ts
index be4281eee281..00b97edde7cf 100644
--- a/src/material/menu/menu-content.ts
+++ b/src/material/menu/menu-content.ts
@@ -41,7 +41,7 @@ export class MatMenuContent implements OnDestroy {
   private _outlet: DomPortalOutlet;
 
   /** Emits when the menu content has been attached. */
-  _attached = new Subject<void>();
+  readonly _attached = new Subject<void>();
 
   constructor(
     private _template: TemplateRef<any>,
diff --git a/src/material/menu/menu-panel.ts b/src/material/menu/menu-panel.ts
index a5f0f1732a46..6fe48f2e0f96 100644
--- a/src/material/menu/menu-panel.ts
+++ b/src/material/menu/menu-panel.ts
@@ -27,7 +27,7 @@ export interface MatMenuPanel<T = any> {
   yPosition: MenuPositionY;
   overlapTrigger: boolean;
   templateRef: TemplateRef<any>;
-  close: EventEmitter<void | 'click' | 'keydown' | 'tab'>;
+  readonly close: EventEmitter<void|'click'|'keydown'|'tab'>;
   parentMenu?: MatMenuPanel | undefined;
   direction?: Direction;
   focusFirstItem: (origin?: FocusOrigin) => void;
diff --git a/src/material/menu/menu.spec.ts b/src/material/menu/menu.spec.ts
index 72eb5c62abcc..b368ccbcb984 100644
--- a/src/material/menu/menu.spec.ts
+++ b/src/material/menu/menu.spec.ts
@@ -2473,7 +2473,7 @@ class CustomMenuPanel implements MatMenuPanel {
   parentMenu: MatMenuPanel;
 
   @ViewChild(TemplateRef) templateRef: TemplateRef<any>;
-  @Output() close = new EventEmitter<void | 'click' | 'keydown' | 'tab'>();
+  @Output() readonly close = new EventEmitter<void|'click'|'keydown'|'tab'>();
   focusFirstItem = () => {};
   resetActiveItem = () => {};
   setPositionClasses = () => {};
diff --git a/src/material/menu/menu.ts b/src/material/menu/menu.ts
index 99c3f7ec935f..285c13cf2584 100644
--- a/src/material/menu/menu.ts
+++ b/src/material/menu/menu.ts
@@ -123,7 +123,7 @@ export class _MatMenuBase implements AfterContentInit, MatMenuPanel<MatMenuItem>
   _panelAnimationState: 'void' | 'enter' = 'void';
 
   /** Emits whenever an animation on the menu completes. */
-  _animationDone = new Subject<AnimationEvent>();
+  readonly _animationDone = new Subject<AnimationEvent>();
 
   /** Whether the menu is animating. */
   _isAnimating: boolean;
@@ -251,7 +251,7 @@ export class _MatMenuBase implements AfterContentInit, MatMenuPanel<MatMenuItem>
    * @deprecated Switch to `closed` instead
    * @breaking-change 8.0.0
    */
-  @Output() close: EventEmitter<MenuCloseReason> = this.closed;
+  @Output() readonly close: EventEmitter<MenuCloseReason> = this.closed;
 
   readonly panelId = `mat-menu-panel-${menuPanelUid++}`;
 
diff --git a/src/material/progress-bar/progress-bar.ts b/src/material/progress-bar/progress-bar.ts
index dbe7e4059fac..f7d59f6ae7fa 100644
--- a/src/material/progress-bar/progress-bar.ts
+++ b/src/material/progress-bar/progress-bar.ts
@@ -153,7 +153,7 @@ export class MatProgressBar extends _MatProgressBarMixinBase implements CanColor
    * be emitted when animations are disabled, nor will it be emitted for modes with continuous
    * animations (indeterminate and query).
    */
-  @Output() animationEnd = new EventEmitter<ProgressAnimationEnd>();
+  @Output() readonly animationEnd = new EventEmitter<ProgressAnimationEnd>();
 
   /** Reference to animation end subscription to be unsubscribed on destroy. */
   private _animationEndSubscription: Subscription = Subscription.EMPTY;
diff --git a/src/material/select/select.ts b/src/material/select/select.ts
index 1d1cb7601500..26d5aba70c43 100644
--- a/src/material/select/select.ts
+++ b/src/material/select/select.ts
@@ -287,7 +287,7 @@ export abstract class _MatSelectBase<C> extends _MatSelectMixinBase implements A
   _valueId = `mat-select-value-${nextUniqueId++}`;
 
   /** Emits when the panel element is finished transforming in. */
-  _panelDoneAnimatingStream = new Subject<string>();
+  readonly _panelDoneAnimatingStream = new Subject<string>();
 
   /** Strategy that will be used to handle scrolling while the select panel is open. */
   _scrollStrategy: ScrollStrategy;
diff --git a/src/material/sidenav/drawer.ts b/src/material/sidenav/drawer.ts
index 171a486d81c1..17804b88a89d 100644
--- a/src/material/sidenav/drawer.ts
+++ b/src/material/sidenav/drawer.ts
@@ -204,16 +204,16 @@ export class MatDrawer implements AfterContentInit, AfterContentChecked, OnDestr
   private _openedVia: FocusOrigin | null;
 
   /** Emits whenever the drawer has started animating. */
-  _animationStarted = new Subject<AnimationEvent>();
+  readonly _animationStarted = new Subject<AnimationEvent>();
 
   /** Emits whenever the drawer is done animating. */
-  _animationEnd = new Subject<AnimationEvent>();
+  readonly _animationEnd = new Subject<AnimationEvent>();
 
   /** Current state of the sidenav animation. */
   // @HostBinding is used in the class as it is expected to be extended.  Since @Component decorator
   // metadata is not inherited by child classes, instead the host binding data is defined in a way
   // that can be inherited.
-  // tslint:disable:no-host-decorator-in-concrete
+  // tslint:disable-next-line:no-host-decorator-in-concrete
   @HostBinding('@transform')
   _animationState: 'open-instant' | 'open' | 'void' = 'void';
 
@@ -224,7 +224,7 @@ export class MatDrawer implements AfterContentInit, AfterContentChecked, OnDestr
 
   /** Event emitted when the drawer has been opened. */
   @Output('opened')
-  _openedStream = this.openedChange.pipe(filter(o => o), map(() => {}));
+  readonly _openedStream = this.openedChange.pipe(filter(o => o), map(() => {}));
 
   /** Event emitted when the drawer has started opening. */
   @Output()
@@ -235,7 +235,7 @@ export class MatDrawer implements AfterContentInit, AfterContentChecked, OnDestr
 
   /** Event emitted when the drawer has been closed. */
   @Output('closed')
-  _closedStream = this.openedChange.pipe(filter(o => !o), map(() => {}));
+  readonly _closedStream = this.openedChange.pipe(filter(o => !o), map(() => {}));
 
   /** Event emitted when the drawer has started closing. */
   @Output()
@@ -249,7 +249,7 @@ export class MatDrawer implements AfterContentInit, AfterContentChecked, OnDestr
 
   /** Event emitted when the drawer's position changes. */
   // tslint:disable-next-line:no-output-on-prefix
-  @Output('positionChanged') onPositionChanged: EventEmitter<void> = new EventEmitter<void>();
+  @Output('positionChanged') readonly onPositionChanged = new EventEmitter<void>();
 
   /**
    * An observable that emits when the drawer mode changes. This is used by the drawer container to
diff --git a/src/material/snack-bar/snack-bar-container.ts b/src/material/snack-bar/snack-bar-container.ts
index d0b3112940b7..18e772f79216 100644
--- a/src/material/snack-bar/snack-bar-container.ts
+++ b/src/material/snack-bar/snack-bar-container.ts
@@ -39,9 +39,9 @@ import {MatSnackBarConfig} from './snack-bar-config';
  */
 export interface _SnackBarContainer {
   snackBarConfig: MatSnackBarConfig;
-  _onAnnounce: Subject<any>;
-  _onExit: Subject<any>;
-  _onEnter: Subject<any>;
+  readonly _onAnnounce: Subject<any>;
+  readonly _onExit: Subject<any>;
+  readonly _onEnter: Subject<any>;
   enter: () => void;
   exit: () => Observable<void>;
   attachTemplatePortal: <C>(portal: TemplatePortal<C>) => EmbeddedViewRef<C>;
diff --git a/src/material/stepper/stepper.spec.ts b/src/material/stepper/stepper.spec.ts
index 981abc46e8c5..ed6632b13c88 100644
--- a/src/material/stepper/stepper.spec.ts
+++ b/src/material/stepper/stepper.spec.ts
@@ -56,7 +56,7 @@ import {MatInputModule} from '../input/input-module';
 
 
 const VALID_REGEX = /valid/;
-let dir: {value: Direction, change: EventEmitter<Direction>};
+let dir: {value: Direction, readonly change: EventEmitter<Direction>};
 
 describe('MatStepper', () => {
   beforeEach(() => {
diff --git a/src/material/stepper/stepper.ts b/src/material/stepper/stepper.ts
index 6699f9463e0c..087b69bccf06 100644
--- a/src/material/stepper/stepper.ts
+++ b/src/material/stepper/stepper.ts
@@ -207,7 +207,7 @@ export class MatStepper extends CdkStepper implements AfterContentInit {
   _iconOverrides: Record<string, TemplateRef<MatStepperIconContext>> = {};
 
   /** Stream of animation `done` events when the body expands/collapses. */
-  _animationDone = new Subject<AnimationEvent>();
+  readonly _animationDone = new Subject<AnimationEvent>();
 
   constructor(
     @Optional() dir: Directionality,
diff --git a/src/material/tabs/tab-body.ts b/src/material/tabs/tab-body.ts
index 01529d8dc3f7..fc04af2bbe0c 100644
--- a/src/material/tabs/tab-body.ts
+++ b/src/material/tabs/tab-body.ts
@@ -116,7 +116,7 @@ export abstract class _MatTabBodyBase implements OnInit, OnDestroy {
   _position: MatTabBodyPositionState;
 
   /** Emits when an animation on the tab is complete. */
-  _translateTabComplete = new Subject<AnimationEvent>();
+  readonly _translateTabComplete = new Subject<AnimationEvent>();
 
   /** Event emitted when the tab begins to animate towards the center as the active tab. */
   @Output() readonly _onCentering: EventEmitter<number> = new EventEmitter<number>();
diff --git a/src/material/tree/data-source/flat-data-source.ts b/src/material/tree/data-source/flat-data-source.ts
index 6a5c56a42440..c766adf87c2e 100644
--- a/src/material/tree/data-source/flat-data-source.ts
+++ b/src/material/tree/data-source/flat-data-source.ts
@@ -127,11 +127,11 @@ export class MatTreeFlattener<T, F, K = F> {
  * to type `F` for `MatTree` to consume.
  */
 export class MatTreeFlatDataSource<T, F, K = F> extends DataSource<F> {
-  _flattenedData = new BehaviorSubject<F[]>([]);
+  readonly _flattenedData = new BehaviorSubject<F[]>([]);
 
-  _expandedData = new BehaviorSubject<F[]>([]);
+  readonly _expandedData = new BehaviorSubject<F[]>([]);
 
-  _data: BehaviorSubject<T[]>;
+  readonly _data: BehaviorSubject<T[]>;
   get data() { return this._data.value; }
   set data(value: T[]) {
     this._data.next(value);
diff --git a/src/material/tree/data-source/nested-data-source.ts b/src/material/tree/data-source/nested-data-source.ts
index c6e578c69d91..85a17e6608d0 100644
--- a/src/material/tree/data-source/nested-data-source.ts
+++ b/src/material/tree/data-source/nested-data-source.ts
@@ -18,7 +18,7 @@ import {map} from 'rxjs/operators';
  * or collapse. The expansion/collapsion will be handled by TreeControl and each non-leaf node.
  */
 export class MatTreeNestedDataSource<T> extends DataSource<T> {
-  _data = new BehaviorSubject<T[]>([]);
+  readonly _data = new BehaviorSubject<T[]>([]);
 
   /**
    * Data for the nested tree
diff --git a/src/youtube-player/youtube-player.ts b/src/youtube-player/youtube-player.ts
index f11b45d2b310..d403b0940be5 100644
--- a/src/youtube-player/youtube-player.ts
+++ b/src/youtube-player/youtube-player.ts
@@ -106,12 +106,12 @@ interface PendingPlayerState {
 export class YouTubePlayer implements AfterViewInit, OnDestroy, OnInit {
   /** Whether we're currently rendering inside a browser. */
   private _isBrowser: boolean;
-  private _youtubeContainer = new Subject<HTMLElement>();
-  private _destroyed = new Subject<void>();
+  private readonly _youtubeContainer = new Subject<HTMLElement>();
+  private readonly _destroyed = new Subject<void>();
   private _player: Player | undefined;
   private _existingApiReadyCallback: (() => void) | undefined;
   private _pendingPlayerState: PendingPlayerState | undefined;
-  private _playerChanges = new BehaviorSubject<UninitializedPlayer | undefined>(undefined);
+  private readonly _playerChanges = new BehaviorSubject<UninitializedPlayer | undefined>(undefined);
 
   /** YouTube Video ID to view */
   @Input()
@@ -119,7 +119,7 @@ export class YouTubePlayer implements AfterViewInit, OnDestroy, OnInit {
   set videoId(videoId: string | undefined) {
     this._videoId.next(videoId);
   }
-  private _videoId = new BehaviorSubject<string | undefined>(undefined);
+  private readonly _videoId = new BehaviorSubject<string | undefined>(undefined);
 
   /** Height of video player */
   @Input()
@@ -127,7 +127,7 @@ export class YouTubePlayer implements AfterViewInit, OnDestroy, OnInit {
   set height(height: number | undefined) {
     this._height.next(height || DEFAULT_PLAYER_HEIGHT);
   }
-  private _height = new BehaviorSubject<number>(DEFAULT_PLAYER_HEIGHT);
+  private readonly _height = new BehaviorSubject<number>(DEFAULT_PLAYER_HEIGHT);
 
   /** Width of video player */
   @Input()
@@ -135,28 +135,29 @@ export class YouTubePlayer implements AfterViewInit, OnDestroy, OnInit {
   set width(width: number | undefined) {
     this._width.next(width || DEFAULT_PLAYER_WIDTH);
   }
-  private _width = new BehaviorSubject<number>(DEFAULT_PLAYER_WIDTH);
+  private readonly _width = new BehaviorSubject<number>(DEFAULT_PLAYER_WIDTH);
 
   /** The moment when the player is supposed to start playing */
   @Input()
   set startSeconds(startSeconds: number | undefined) {
     this._startSeconds.next(startSeconds);
   }
-  private _startSeconds = new BehaviorSubject<number | undefined>(undefined);
+  private readonly _startSeconds = new BehaviorSubject<number | undefined>(undefined);
 
   /** The moment when the player is supposed to stop playing */
   @Input()
   set endSeconds(endSeconds: number | undefined) {
     this._endSeconds.next(endSeconds);
   }
-  private _endSeconds = new BehaviorSubject<number | undefined>(undefined);
+  private readonly _endSeconds = new BehaviorSubject<number | undefined>(undefined);
 
   /** The suggested quality of the player */
   @Input()
   set suggestedQuality(suggestedQuality: YT.SuggestedVideoQuality | undefined) {
     this._suggestedQuality.next(suggestedQuality);
   }
-  private _suggestedQuality = new BehaviorSubject<YT.SuggestedVideoQuality | undefined>(undefined);
+  private readonly _suggestedQuality =
+    new BehaviorSubject<YT.SuggestedVideoQuality | undefined>(undefined);
 
   /**
    * Extra parameters used to configure the player. See:
@@ -177,22 +178,22 @@ export class YouTubePlayer implements AfterViewInit, OnDestroy, OnInit {
   @Input() showBeforeIframeApiLoads: boolean | undefined;
 
   /** Outputs are direct proxies from the player itself. */
-  @Output() ready: Observable<YT.PlayerEvent> =
+  @Output() readonly ready: Observable<YT.PlayerEvent> =
       this._getLazyEmitter<YT.PlayerEvent>('onReady');
 
-  @Output() stateChange: Observable<YT.OnStateChangeEvent> =
+  @Output() readonly stateChange: Observable<YT.OnStateChangeEvent> =
       this._getLazyEmitter<YT.OnStateChangeEvent>('onStateChange');
 
-  @Output() error: Observable<YT.OnErrorEvent> =
+  @Output() readonly error: Observable<YT.OnErrorEvent> =
       this._getLazyEmitter<YT.OnErrorEvent>('onError');
 
-  @Output() apiChange: Observable<YT.PlayerEvent> =
+  @Output() readonly apiChange: Observable<YT.PlayerEvent> =
       this._getLazyEmitter<YT.PlayerEvent>('onApiChange');
 
-  @Output() playbackQualityChange: Observable<YT.OnPlaybackQualityChangeEvent> =
+  @Output() readonly playbackQualityChange: Observable<YT.OnPlaybackQualityChangeEvent> =
       this._getLazyEmitter<YT.OnPlaybackQualityChangeEvent>('onPlaybackQualityChange');
 
-  @Output() playbackRateChange: Observable<YT.OnPlaybackRateChangeEvent> =
+  @Output() readonly playbackRateChange: Observable<YT.OnPlaybackRateChangeEvent> =
       this._getLazyEmitter<YT.OnPlaybackRateChangeEvent>('onPlaybackRateChange');
 
   /** The element that will be replaced by the iframe. */
diff --git a/tools/package-tools/inline-resources.ts b/tools/package-tools/inline-resources.ts
index d7b8f98298fa..3eb5f19fb3de 100644
--- a/tools/package-tools/inline-resources.ts
+++ b/tools/package-tools/inline-resources.ts
@@ -1,5 +1,3 @@
-// tslint:disable:no-eval
-
 import {dirname, join} from 'path';
 import {readFileSync, writeFileSync} from 'fs';
 import {sync as glob} from 'glob';
@@ -34,6 +32,7 @@ function inlineStyles(fileContent: string, filePath: string) {
   return fileContent.replace(/styleUrls:\s*(\[[\s\S]*?])/gm, (_match, styleUrlsValue) => {
     // The RegExp matches the array of external style files. This is a string right now and
     // can to be parsed using the `eval` method. The value looks like "['AAA.css', 'BBB.css']"
+    // tslint:disable-next-line:no-eval
     const styleUrls = eval(styleUrlsValue) as string[];
 
     const styleContents = styleUrls
diff --git a/tools/public_api_guard/cdk/a11y.d.ts b/tools/public_api_guard/cdk/a11y.d.ts
index cc933a7fa512..a0a3fb03d7b9 100644
--- a/tools/public_api_guard/cdk/a11y.d.ts
+++ b/tools/public_api_guard/cdk/a11y.d.ts
@@ -37,7 +37,7 @@ export declare class CdkAriaLive implements OnDestroy {
 }
 
 export declare class CdkMonitorFocus implements AfterViewInit, OnDestroy {
-    cdkFocusChange: EventEmitter<FocusOrigin>;
+    readonly cdkFocusChange: EventEmitter<FocusOrigin>;
     constructor(_elementRef: ElementRef<HTMLElement>, _focusMonitor: FocusMonitor);
     ngAfterViewInit(): void;
     ngOnDestroy(): void;
@@ -207,8 +207,8 @@ export declare class IsFocusableConfig {
 export declare class ListKeyManager<T extends ListKeyManagerOption> {
     get activeItem(): T | null;
     get activeItemIndex(): number | null;
-    change: Subject<number>;
-    tabOut: Subject<void>;
+    readonly change: Subject<number>;
+    readonly tabOut: Subject<void>;
     constructor(_items: QueryList<T> | T[]);
     isTyping(): boolean;
     onKeydown(event: KeyboardEvent): void;
diff --git a/tools/public_api_guard/cdk/accordion.d.ts b/tools/public_api_guard/cdk/accordion.d.ts
index a14175b381d5..ab95be95b870 100644
--- a/tools/public_api_guard/cdk/accordion.d.ts
+++ b/tools/public_api_guard/cdk/accordion.d.ts
@@ -16,15 +16,15 @@ export declare class CdkAccordion implements OnDestroy, OnChanges {
 export declare class CdkAccordionItem implements OnDestroy {
     protected _expansionDispatcher: UniqueSelectionDispatcher;
     accordion: CdkAccordion;
-    closed: EventEmitter<void>;
-    destroyed: EventEmitter<void>;
+    readonly closed: EventEmitter<void>;
+    readonly destroyed: EventEmitter<void>;
     get disabled(): boolean;
     set disabled(disabled: boolean);
     get expanded(): boolean;
     set expanded(expanded: boolean);
-    expandedChange: EventEmitter<boolean>;
+    readonly expandedChange: EventEmitter<boolean>;
     readonly id: string;
-    opened: EventEmitter<void>;
+    readonly opened: EventEmitter<void>;
     constructor(accordion: CdkAccordion, _changeDetectorRef: ChangeDetectorRef, _expansionDispatcher: UniqueSelectionDispatcher);
     close(): void;
     ngOnDestroy(): void;
diff --git a/tools/public_api_guard/cdk/bidi.d.ts b/tools/public_api_guard/cdk/bidi.d.ts
index cabd83e3676e..a83c328a802f 100644
--- a/tools/public_api_guard/cdk/bidi.d.ts
+++ b/tools/public_api_guard/cdk/bidi.d.ts
@@ -6,7 +6,7 @@ export declare class BidiModule {
 
 export declare class Dir implements Directionality, AfterContentInit, OnDestroy {
     _rawDir: string;
-    change: EventEmitter<Direction>;
+    readonly change: EventEmitter<Direction>;
     get dir(): Direction;
     set dir(value: Direction);
     get value(): Direction;
diff --git a/tools/public_api_guard/cdk/clipboard.d.ts b/tools/public_api_guard/cdk/clipboard.d.ts
index d935cc6465cc..770a939ee635 100644
--- a/tools/public_api_guard/cdk/clipboard.d.ts
+++ b/tools/public_api_guard/cdk/clipboard.d.ts
@@ -2,7 +2,7 @@ export declare const CDK_COPY_TO_CLIPBOARD_CONFIG: InjectionToken<CdkCopyToClipb
 
 export declare class CdkCopyToClipboard implements OnDestroy {
     attempts: number;
-    copied: EventEmitter<boolean>;
+    readonly copied: EventEmitter<boolean>;
     text: string;
     constructor(_clipboard: Clipboard, _ngZone: NgZone, config?: CdkCopyToClipboardConfig);
     copy(attempts?: number): void;
diff --git a/tools/public_api_guard/cdk/collections.d.ts b/tools/public_api_guard/cdk/collections.d.ts
index 193e63f3038e..6a4e24eb0314 100644
--- a/tools/public_api_guard/cdk/collections.d.ts
+++ b/tools/public_api_guard/cdk/collections.d.ts
@@ -76,7 +76,7 @@ export interface SelectionChange<T> {
 }
 
 export declare class SelectionModel<T> {
-    changed: Subject<SelectionChange<T>>;
+    readonly changed: Subject<SelectionChange<T>>;
     get selected(): T[];
     constructor(_multiple?: boolean, initiallySelectedValues?: T[], _emitChanges?: boolean);
     clear(): void;
diff --git a/tools/public_api_guard/cdk/drag-drop.d.ts b/tools/public_api_guard/cdk/drag-drop.d.ts
index f134e79208b0..8bbae08f47db 100644
--- a/tools/public_api_guard/cdk/drag-drop.d.ts
+++ b/tools/public_api_guard/cdk/drag-drop.d.ts
@@ -24,22 +24,22 @@ export declare class CdkDrag<T = any> implements AfterViewInit, OnChanges, OnDes
     set disabled(value: boolean);
     dragStartDelay: DragStartDelay;
     dropContainer: CdkDropList;
-    dropped: EventEmitter<CdkDragDrop<any>>;
+    readonly dropped: EventEmitter<CdkDragDrop<any>>;
     element: ElementRef<HTMLElement>;
-    ended: EventEmitter<CdkDragEnd>;
-    entered: EventEmitter<CdkDragEnter<any>>;
-    exited: EventEmitter<CdkDragExit<any>>;
+    readonly ended: EventEmitter<CdkDragEnd>;
+    readonly entered: EventEmitter<CdkDragEnter<any>>;
+    readonly exited: EventEmitter<CdkDragExit<any>>;
     freeDragPosition: {
         x: number;
         y: number;
     };
     lockAxis: DragAxis;
-    moved: Observable<CdkDragMove<T>>;
+    readonly moved: Observable<CdkDragMove<T>>;
     previewClass: string | string[];
     previewContainer: PreviewContainer;
-    released: EventEmitter<CdkDragRelease>;
+    readonly released: EventEmitter<CdkDragRelease>;
     rootElementSelector: string;
-    started: EventEmitter<CdkDragStart>;
+    readonly started: EventEmitter<CdkDragStart>;
     constructor(
     element: ElementRef<HTMLElement>,
     dropContainer: CdkDropList,
@@ -101,7 +101,7 @@ export interface CdkDragExit<T = any, I = T> {
 
 export declare class CdkDragHandle implements OnDestroy {
     _parentDrag: {} | undefined;
-    _stateChanges: Subject<CdkDragHandle>;
+    readonly _stateChanges: Subject<CdkDragHandle>;
     get disabled(): boolean;
     set disabled(value: boolean);
     element: ElementRef<HTMLElement>;
@@ -171,16 +171,16 @@ export declare class CdkDropList<T = any> implements OnDestroy {
     data: T;
     get disabled(): boolean;
     set disabled(value: boolean);
-    dropped: EventEmitter<CdkDragDrop<T, any>>;
+    readonly dropped: EventEmitter<CdkDragDrop<T, any>>;
     element: ElementRef<HTMLElement>;
     enterPredicate: (drag: CdkDrag, drop: CdkDropList) => boolean;
-    entered: EventEmitter<CdkDragEnter<T>>;
-    exited: EventEmitter<CdkDragExit<T>>;
+    readonly entered: EventEmitter<CdkDragEnter<T>>;
+    readonly exited: EventEmitter<CdkDragExit<T>>;
     id: string;
     lockAxis: DragAxis;
     orientation: DropListOrientation;
     sortPredicate: (index: number, drag: CdkDrag, drop: CdkDropList) => boolean;
-    sorted: EventEmitter<CdkDragSortEvent<T>>;
+    readonly sorted: EventEmitter<CdkDragSortEvent<T>>;
     sortingDisabled: boolean;
     constructor(
     element: ElementRef<HTMLElement>, dragDrop: DragDrop, _changeDetectorRef: ChangeDetectorRef, _scrollDispatcher: ScrollDispatcher, _dir?: Directionality | undefined, _group?: CdkDropListGroup<CdkDropList<any>> | undefined, config?: DragDropConfig);
@@ -261,7 +261,7 @@ export declare class DragDropRegistry<I extends {
 }
 
 export declare class DragRef<T = any> {
-    beforeStarted: Subject<void>;
+    readonly beforeStarted: Subject<void>;
     constrainPosition?: (point: Point, dragRef: DragRef) => Point;
     data: T;
     get disabled(): boolean;
@@ -270,7 +270,7 @@ export declare class DragRef<T = any> {
         touch: number;
         mouse: number;
     };
-    dropped: Subject<{
+    readonly dropped: Subject<{
         previousIndex: number;
         currentIndex: number;
         item: DragRef;
@@ -280,22 +280,22 @@ export declare class DragRef<T = any> {
         dropPoint: Point;
         isPointerOverContainer: boolean;
     }>;
-    ended: Subject<{
+    readonly ended: Subject<{
         source: DragRef;
         distance: Point;
         dropPoint: Point;
     }>;
-    entered: Subject<{
+    readonly entered: Subject<{
         container: DropListRef;
         item: DragRef;
         currentIndex: number;
     }>;
-    exited: Subject<{
+    readonly exited: Subject<{
         container: DropListRef;
         item: DragRef;
     }>;
     lockAxis: 'x' | 'y';
-    moved: Observable<{
+    readonly moved: Observable<{
         source: DragRef;
         pointerPosition: {
             x: number;
@@ -309,10 +309,10 @@ export declare class DragRef<T = any> {
         };
     }>;
     previewClass: string | string[] | undefined;
-    released: Subject<{
+    readonly released: Subject<{
         source: DragRef;
     }>;
-    started: Subject<{
+    readonly started: Subject<{
         source: DragRef;
     }>;
     constructor(element: ElementRef<HTMLElement> | HTMLElement, _config: DragRefConfig, _document: Document, _ngZone: NgZone, _viewportRuler: ViewportRuler, _dragDropRegistry: DragDropRegistry<DragRef, DropListRef>);
@@ -355,10 +355,10 @@ export declare type DropListOrientation = 'horizontal' | 'vertical';
 export declare class DropListRef<T = any> {
     autoScrollDisabled: boolean;
     autoScrollStep: number;
-    beforeStarted: Subject<void>;
+    readonly beforeStarted: Subject<void>;
     data: T;
     disabled: boolean;
-    dropped: Subject<{
+    readonly dropped: Subject<{
         item: DragRef;
         currentIndex: number;
         previousIndex: number;
@@ -370,18 +370,18 @@ export declare class DropListRef<T = any> {
     }>;
     element: HTMLElement | ElementRef<HTMLElement>;
     enterPredicate: (drag: DragRef, drop: DropListRef) => boolean;
-    entered: Subject<{
+    readonly entered: Subject<{
         item: DragRef;
         container: DropListRef;
         currentIndex: number;
     }>;
-    exited: Subject<{
+    readonly exited: Subject<{
         item: DragRef;
         container: DropListRef;
     }>;
     lockAxis: 'x' | 'y';
     sortPredicate: (index: number, drag: DragRef, drop: DropListRef) => boolean;
-    sorted: Subject<{
+    readonly sorted: Subject<{
         previousIndex: number;
         currentIndex: number;
         container: DropListRef;
diff --git a/tools/public_api_guard/cdk/observers.d.ts b/tools/public_api_guard/cdk/observers.d.ts
index 9e431f1239e3..94d914a85c63 100644
--- a/tools/public_api_guard/cdk/observers.d.ts
+++ b/tools/public_api_guard/cdk/observers.d.ts
@@ -3,7 +3,7 @@ export declare class CdkObserveContent implements AfterContentInit, OnDestroy {
     set debounce(value: number);
     get disabled(): any;
     set disabled(value: any);
-    event: EventEmitter<MutationRecord[]>;
+    readonly event: EventEmitter<MutationRecord[]>;
     constructor(_contentObserver: ContentObserver, _elementRef: ElementRef<HTMLElement>, _ngZone: NgZone);
     ngAfterContentInit(): void;
     ngOnDestroy(): void;
diff --git a/tools/public_api_guard/cdk/overlay.d.ts b/tools/public_api_guard/cdk/overlay.d.ts
index 1c81f6734217..def4dde5d175 100644
--- a/tools/public_api_guard/cdk/overlay.d.ts
+++ b/tools/public_api_guard/cdk/overlay.d.ts
@@ -6,10 +6,10 @@ export declare class BlockScrollStrategy implements ScrollStrategy {
 }
 
 export declare class CdkConnectedOverlay implements OnDestroy, OnChanges {
-    attach: EventEmitter<void>;
+    readonly attach: EventEmitter<void>;
     backdropClass: string;
-    backdropClick: EventEmitter<MouseEvent>;
-    detach: EventEmitter<void>;
+    readonly backdropClick: EventEmitter<MouseEvent>;
+    readonly detach: EventEmitter<void>;
     get dir(): Direction;
     disableClose: boolean;
     get flexibleDimensions(): boolean;
@@ -29,11 +29,11 @@ export declare class CdkConnectedOverlay implements OnDestroy, OnChanges {
     set offsetY(offsetY: number);
     open: boolean;
     origin: CdkOverlayOrigin;
-    overlayKeydown: EventEmitter<KeyboardEvent>;
-    overlayOutsideClick: EventEmitter<MouseEvent>;
+    readonly overlayKeydown: EventEmitter<KeyboardEvent>;
+    readonly overlayOutsideClick: EventEmitter<MouseEvent>;
     get overlayRef(): OverlayRef;
     panelClass: string | string[];
-    positionChange: EventEmitter<ConnectedOverlayPositionChange>;
+    readonly positionChange: EventEmitter<ConnectedOverlayPositionChange>;
     positionStrategy: FlexibleConnectedPositionStrategy;
     positions: ConnectedPosition[];
     get push(): boolean;
@@ -264,8 +264,8 @@ export declare class OverlayPositionBuilder {
 }
 
 export declare class OverlayRef implements PortalOutlet, OverlayReference {
-    _keydownEvents: Subject<KeyboardEvent>;
-    _outsidePointerEvents: Subject<MouseEvent>;
+    readonly _keydownEvents: Subject<KeyboardEvent>;
+    readonly _outsidePointerEvents: Subject<MouseEvent>;
     get backdropElement(): HTMLElement | null;
     get hostElement(): HTMLElement;
     get overlayElement(): HTMLElement;
diff --git a/tools/public_api_guard/cdk/portal.d.ts b/tools/public_api_guard/cdk/portal.d.ts
index 615686531334..887f73971a0f 100644
--- a/tools/public_api_guard/cdk/portal.d.ts
+++ b/tools/public_api_guard/cdk/portal.d.ts
@@ -23,7 +23,7 @@ export declare class CdkPortal extends TemplatePortal {
 
 export declare class CdkPortalOutlet extends BasePortalOutlet implements OnInit, OnDestroy {
     attachDomPortal: (portal: DomPortal) => void;
-    attached: EventEmitter<CdkPortalOutletAttachedRef>;
+    readonly attached: EventEmitter<CdkPortalOutletAttachedRef>;
     get attachedRef(): CdkPortalOutletAttachedRef;
     get portal(): Portal<any> | null;
     set portal(portal: Portal<any> | null);
diff --git a/tools/public_api_guard/cdk/scrolling.d.ts b/tools/public_api_guard/cdk/scrolling.d.ts
index 632b64daeb0b..c58a8fd6b605 100644
--- a/tools/public_api_guard/cdk/scrolling.d.ts
+++ b/tools/public_api_guard/cdk/scrolling.d.ts
@@ -84,8 +84,8 @@ export declare class CdkVirtualForOf<T> implements CdkVirtualScrollRepeater<T>,
     set cdkVirtualForTemplateCacheSize(size: number);
     get cdkVirtualForTrackBy(): TrackByFunction<T> | undefined;
     set cdkVirtualForTrackBy(fn: TrackByFunction<T> | undefined);
-    dataStream: Observable<readonly T[]>;
-    viewChange: Subject<ListRange>;
+    readonly dataStream: Observable<readonly T[]>;
+    readonly viewChange: Subject<ListRange>;
     constructor(
     _viewContainerRef: ViewContainerRef,
     _template: TemplateRef<CdkVirtualForOfContext<T>>,
@@ -112,7 +112,7 @@ export declare type CdkVirtualForOfContext<T> = {
 };
 
 export interface CdkVirtualScrollRepeater<T> {
-    dataStream: Observable<readonly T[]>;
+    readonly dataStream: Observable<readonly T[]>;
     measureRangeSize(range: ListRange, orientation: 'horizontal' | 'vertical'): number;
 }
 
@@ -123,8 +123,8 @@ export declare class CdkVirtualScrollViewport extends CdkScrollable implements O
     elementRef: ElementRef<HTMLElement>;
     get orientation(): 'horizontal' | 'vertical';
     set orientation(orientation: 'horizontal' | 'vertical');
-    renderedRangeStream: Observable<ListRange>;
-    scrolledIndexChange: Observable<number>;
+    readonly renderedRangeStream: Observable<ListRange>;
+    readonly scrolledIndexChange: Observable<number>;
     constructor(elementRef: ElementRef<HTMLElement>, _changeDetectorRef: ChangeDetectorRef, ngZone: NgZone, _scrollStrategy: VirtualScrollStrategy, dir: Directionality, scrollDispatcher: ScrollDispatcher, viewportRuler: ViewportRuler);
     attach(forOf: CdkVirtualScrollRepeater<any>): void;
     checkViewportSize(): void;
diff --git a/tools/public_api_guard/cdk/stepper.d.ts b/tools/public_api_guard/cdk/stepper.d.ts
index 414c8461b916..d82ee98a04ec 100644
--- a/tools/public_api_guard/cdk/stepper.d.ts
+++ b/tools/public_api_guard/cdk/stepper.d.ts
@@ -48,7 +48,7 @@ export declare class CdkStepLabel {
 }
 
 export declare class CdkStepper implements AfterContentInit, AfterViewInit, OnDestroy {
-    protected _destroyed: Subject<void>;
+    protected readonly _destroyed: Subject<void>;
     _groupId: number;
     protected _orientation: StepperOrientation;
     _stepHeader: QueryList<CdkStepHeader>;
@@ -61,7 +61,7 @@ export declare class CdkStepper implements AfterContentInit, AfterViewInit, OnDe
     set selected(step: CdkStep | undefined);
     get selectedIndex(): number;
     set selectedIndex(index: number);
-    selectionChange: EventEmitter<StepperSelectionEvent>;
+    readonly selectionChange: EventEmitter<StepperSelectionEvent>;
     readonly steps: QueryList<CdkStep>;
     constructor(_dir: Directionality, _changeDetectorRef: ChangeDetectorRef, _elementRef: ElementRef<HTMLElement>, _document: any);
     _getAnimationDirection(index: number): StepContentPositionState;
diff --git a/tools/public_api_guard/cdk/table.d.ts b/tools/public_api_guard/cdk/table.d.ts
index b2f45ff0a0de..cea82453eef1 100644
--- a/tools/public_api_guard/cdk/table.d.ts
+++ b/tools/public_api_guard/cdk/table.d.ts
@@ -221,7 +221,7 @@ export declare class CdkTable<T> implements AfterContentChecked, CollectionViewe
     protected stickyCssClass: string;
     get trackBy(): TrackByFunction<T>;
     set trackBy(fn: TrackByFunction<T>);
-    viewChange: BehaviorSubject<{
+    readonly viewChange: BehaviorSubject<{
         start: number;
         end: number;
     }>;
diff --git a/tools/public_api_guard/cdk/text-field.d.ts b/tools/public_api_guard/cdk/text-field.d.ts
index 069cfbdd389c..59273122677d 100644
--- a/tools/public_api_guard/cdk/text-field.d.ts
+++ b/tools/public_api_guard/cdk/text-field.d.ts
@@ -15,7 +15,7 @@ export declare class AutofillMonitor implements OnDestroy {
 }
 
 export declare class CdkAutofill implements OnDestroy, OnInit {
-    cdkAutofill: EventEmitter<AutofillEvent>;
+    readonly cdkAutofill: EventEmitter<AutofillEvent>;
     constructor(_elementRef: ElementRef<HTMLElement>, _autofillMonitor: AutofillMonitor);
     ngOnDestroy(): void;
     ngOnInit(): void;
diff --git a/tools/public_api_guard/cdk/tree.d.ts b/tools/public_api_guard/cdk/tree.d.ts
index 0c57e902e52a..b5d564c00eb1 100644
--- a/tools/public_api_guard/cdk/tree.d.ts
+++ b/tools/public_api_guard/cdk/tree.d.ts
@@ -44,7 +44,7 @@ export declare class CdkTree<T, K = T> implements AfterContentChecked, Collectio
     set dataSource(dataSource: DataSource<T> | Observable<T[]> | T[]);
     trackBy: TrackByFunction<T>;
     treeControl: TreeControl<T, K>;
-    viewChange: BehaviorSubject<{
+    readonly viewChange: BehaviorSubject<{
         start: number;
         end: number;
     }>;
@@ -67,8 +67,8 @@ export declare class CdkTreeModule {
 
 export declare class CdkTreeNode<T, K = T> implements DoCheck, FocusableOption, OnDestroy, OnInit {
     protected _data: T;
-    _dataChanges: Subject<void>;
-    protected _destroyed: Subject<void>;
+    readonly _dataChanges: Subject<void>;
+    protected readonly _destroyed: Subject<void>;
     protected _elementRef: ElementRef<HTMLElement>;
     protected _isAriaExpanded: boolean;
     protected _tree: CdkTree<T, K>;
diff --git a/tools/public_api_guard/google-maps/google-maps.d.ts b/tools/public_api_guard/google-maps/google-maps.d.ts
index af7dc713285e..29080a5c78d8 100644
--- a/tools/public_api_guard/google-maps/google-maps.d.ts
+++ b/tools/public_api_guard/google-maps/google-maps.d.ts
@@ -1,34 +1,34 @@
 export declare class GoogleMap implements OnChanges, OnInit, OnDestroy {
     _isBrowser: boolean;
-    boundsChanged: Observable<void>;
+    readonly boundsChanged: Observable<void>;
     set center(center: google.maps.LatLngLiteral | google.maps.LatLng);
-    centerChanged: Observable<void>;
+    readonly centerChanged: Observable<void>;
     get controls(): google.maps.MVCArray<Node>[];
     get data(): google.maps.Data;
     googleMap?: google.maps.Map;
-    headingChanged: Observable<void>;
+    readonly headingChanged: Observable<void>;
     height: string | number | null;
-    idle: Observable<void>;
-    mapClick: Observable<google.maps.MapMouseEvent | google.maps.IconMouseEvent>;
-    mapDblclick: Observable<google.maps.MapMouseEvent>;
-    mapDrag: Observable<void>;
-    mapDragend: Observable<void>;
-    mapDragstart: Observable<void>;
-    mapMousemove: Observable<google.maps.MapMouseEvent>;
-    mapMouseout: Observable<google.maps.MapMouseEvent>;
-    mapMouseover: Observable<google.maps.MapMouseEvent>;
-    mapRightclick: Observable<google.maps.MapMouseEvent>;
+    readonly idle: Observable<void>;
+    readonly mapClick: Observable<google.maps.MapMouseEvent | google.maps.IconMouseEvent>;
+    readonly mapDblclick: Observable<google.maps.MapMouseEvent>;
+    readonly mapDrag: Observable<void>;
+    readonly mapDragend: Observable<void>;
+    readonly mapDragstart: Observable<void>;
+    readonly mapMousemove: Observable<google.maps.MapMouseEvent>;
+    readonly mapMouseout: Observable<google.maps.MapMouseEvent>;
+    readonly mapMouseover: Observable<google.maps.MapMouseEvent>;
+    readonly mapRightclick: Observable<google.maps.MapMouseEvent>;
     mapTypeId: google.maps.MapTypeId | undefined;
     get mapTypes(): google.maps.MapTypeRegistry;
-    maptypeidChanged: Observable<void>;
+    readonly maptypeidChanged: Observable<void>;
     set options(options: google.maps.MapOptions);
     get overlayMapTypes(): google.maps.MVCArray<google.maps.MapType>;
-    projectionChanged: Observable<void>;
-    tilesloaded: Observable<void>;
-    tiltChanged: Observable<void>;
+    readonly projectionChanged: Observable<void>;
+    readonly tilesloaded: Observable<void>;
+    readonly tiltChanged: Observable<void>;
     width: string | number | null;
     set zoom(zoom: number);
-    zoomChanged: Observable<void>;
+    readonly zoomChanged: Observable<void>;
     constructor(_elementRef: ElementRef, _ngZone: NgZone, platformId: Object);
     fitBounds(bounds: google.maps.LatLngBounds | google.maps.LatLngBoundsLiteral, padding?: number | google.maps.Padding): void;
     getBounds(): google.maps.LatLngBounds | null;
@@ -86,22 +86,22 @@ export declare class MapBicyclingLayer extends MapBaseLayer {
 
 export declare class MapCircle implements OnInit, OnDestroy {
     set center(center: google.maps.LatLng | google.maps.LatLngLiteral);
-    centerChanged: Observable<void>;
+    readonly centerChanged: Observable<void>;
     circle?: google.maps.Circle;
-    circleClick: Observable<google.maps.MapMouseEvent>;
-    circleDblclick: Observable<google.maps.MapMouseEvent>;
-    circleDrag: Observable<google.maps.MapMouseEvent>;
-    circleDragend: Observable<google.maps.MapMouseEvent>;
-    circleDragstart: Observable<google.maps.MapMouseEvent>;
-    circleMousedown: Observable<google.maps.MapMouseEvent>;
-    circleMousemove: Observable<google.maps.MapMouseEvent>;
-    circleMouseout: Observable<google.maps.MapMouseEvent>;
-    circleMouseover: Observable<google.maps.MapMouseEvent>;
-    circleMouseup: Observable<google.maps.MapMouseEvent>;
-    circleRightclick: Observable<google.maps.MapMouseEvent>;
+    readonly circleClick: Observable<google.maps.MapMouseEvent>;
+    readonly circleDblclick: Observable<google.maps.MapMouseEvent>;
+    readonly circleDrag: Observable<google.maps.MapMouseEvent>;
+    readonly circleDragend: Observable<google.maps.MapMouseEvent>;
+    readonly circleDragstart: Observable<google.maps.MapMouseEvent>;
+    readonly circleMousedown: Observable<google.maps.MapMouseEvent>;
+    readonly circleMousemove: Observable<google.maps.MapMouseEvent>;
+    readonly circleMouseout: Observable<google.maps.MapMouseEvent>;
+    readonly circleMouseover: Observable<google.maps.MapMouseEvent>;
+    readonly circleMouseup: Observable<google.maps.MapMouseEvent>;
+    readonly circleRightclick: Observable<google.maps.MapMouseEvent>;
     set options(options: google.maps.CircleOptions);
     set radius(radius: number);
-    radiusChanged: Observable<void>;
+    readonly radiusChanged: Observable<void>;
     constructor(_map: GoogleMap, _ngZone: NgZone);
     getBounds(): google.maps.LatLngBounds;
     getCenter(): google.maps.LatLng;
@@ -117,7 +117,7 @@ export declare class MapCircle implements OnInit, OnDestroy {
 
 export declare class MapDirectionsRenderer implements OnInit, OnChanges, OnDestroy {
     set directions(directions: google.maps.DirectionsResult);
-    directionsChanged: Observable<void>;
+    readonly directionsChanged: Observable<void>;
     directionsRenderer?: google.maps.DirectionsRenderer;
     set options(options: google.maps.DirectionsRendererOptions);
     constructor(_googleMap: GoogleMap, _ngZone: NgZone);
@@ -160,8 +160,8 @@ export declare class MapGroundOverlay implements OnInit, OnDestroy {
     set bounds(bounds: google.maps.LatLngBounds | google.maps.LatLngBoundsLiteral);
     clickable: boolean;
     groundOverlay?: google.maps.GroundOverlay;
-    mapClick: Observable<google.maps.MapMouseEvent>;
-    mapDblclick: Observable<google.maps.MapMouseEvent>;
+    readonly mapClick: Observable<google.maps.MapMouseEvent>;
+    readonly mapDblclick: Observable<google.maps.MapMouseEvent>;
     set opacity(opacity: number);
     set url(url: string);
     constructor(_map: GoogleMap, _ngZone: NgZone);
@@ -188,14 +188,14 @@ export declare class MapHeatmapLayer implements OnInit, OnChanges, OnDestroy {
 }
 
 export declare class MapInfoWindow implements OnInit, OnDestroy {
-    closeclick: Observable<void>;
-    contentChanged: Observable<void>;
-    domready: Observable<void>;
+    readonly closeclick: Observable<void>;
+    readonly contentChanged: Observable<void>;
+    readonly domready: Observable<void>;
     infoWindow?: google.maps.InfoWindow;
     set options(options: google.maps.InfoWindowOptions);
     set position(position: google.maps.LatLngLiteral | google.maps.LatLng);
-    positionChanged: Observable<void>;
-    zindexChanged: Observable<void>;
+    readonly positionChanged: Observable<void>;
+    readonly zindexChanged: Observable<void>;
     constructor(_googleMap: GoogleMap, _elementRef: ElementRef<HTMLElement>, _ngZone: NgZone);
     close(): void;
     getContent(): string | Node;
@@ -209,11 +209,11 @@ export declare class MapInfoWindow implements OnInit, OnDestroy {
 }
 
 export declare class MapKmlLayer implements OnInit, OnDestroy {
-    defaultviewportChanged: Observable<void>;
-    kmlClick: Observable<google.maps.KmlMouseEvent>;
+    readonly defaultviewportChanged: Observable<void>;
+    readonly kmlClick: Observable<google.maps.KmlMouseEvent>;
     kmlLayer?: google.maps.KmlLayer;
     set options(options: google.maps.KmlLayerOptions);
-    statusChanged: Observable<void>;
+    readonly statusChanged: Observable<void>;
     set url(url: string);
     constructor(_map: GoogleMap, _ngZone: NgZone);
     getDefaultViewport(): google.maps.LatLngBounds;
@@ -228,34 +228,34 @@ export declare class MapKmlLayer implements OnInit, OnDestroy {
 }
 
 export declare class MapMarker implements OnInit, OnChanges, OnDestroy, MapAnchorPoint {
-    animationChanged: Observable<void>;
+    readonly animationChanged: Observable<void>;
     set clickable(clickable: boolean);
-    clickableChanged: Observable<void>;
-    cursorChanged: Observable<void>;
-    draggableChanged: Observable<void>;
-    flatChanged: Observable<void>;
+    readonly clickableChanged: Observable<void>;
+    readonly cursorChanged: Observable<void>;
+    readonly draggableChanged: Observable<void>;
+    readonly flatChanged: Observable<void>;
     set icon(icon: string | google.maps.Icon | google.maps.Symbol);
-    iconChanged: Observable<void>;
+    readonly iconChanged: Observable<void>;
     set label(label: string | google.maps.MarkerLabel);
-    mapClick: Observable<google.maps.MapMouseEvent>;
-    mapDblclick: Observable<google.maps.MapMouseEvent>;
-    mapDrag: Observable<google.maps.MapMouseEvent>;
-    mapDragend: Observable<google.maps.MapMouseEvent>;
-    mapDragstart: Observable<google.maps.MapMouseEvent>;
-    mapMousedown: Observable<google.maps.MapMouseEvent>;
-    mapMouseout: Observable<google.maps.MapMouseEvent>;
-    mapMouseover: Observable<google.maps.MapMouseEvent>;
-    mapMouseup: Observable<google.maps.MapMouseEvent>;
-    mapRightclick: Observable<google.maps.MapMouseEvent>;
+    readonly mapClick: Observable<google.maps.MapMouseEvent>;
+    readonly mapDblclick: Observable<google.maps.MapMouseEvent>;
+    readonly mapDrag: Observable<google.maps.MapMouseEvent>;
+    readonly mapDragend: Observable<google.maps.MapMouseEvent>;
+    readonly mapDragstart: Observable<google.maps.MapMouseEvent>;
+    readonly mapMousedown: Observable<google.maps.MapMouseEvent>;
+    readonly mapMouseout: Observable<google.maps.MapMouseEvent>;
+    readonly mapMouseover: Observable<google.maps.MapMouseEvent>;
+    readonly mapMouseup: Observable<google.maps.MapMouseEvent>;
+    readonly mapRightclick: Observable<google.maps.MapMouseEvent>;
     marker?: google.maps.Marker;
     set options(options: google.maps.MarkerOptions);
     set position(position: google.maps.LatLngLiteral | google.maps.LatLng);
-    positionChanged: Observable<void>;
-    shapeChanged: Observable<void>;
+    readonly positionChanged: Observable<void>;
+    readonly shapeChanged: Observable<void>;
     set title(title: string);
-    titleChanged: Observable<void>;
-    visibleChanged: Observable<void>;
-    zindexChanged: Observable<void>;
+    readonly titleChanged: Observable<void>;
+    readonly visibleChanged: Observable<void>;
+    readonly zindexChanged: Observable<void>;
     constructor(_googleMap: GoogleMap, _ngZone: NgZone);
     getAnchor(): google.maps.MVCObject;
     getAnimation(): google.maps.Animation | null;
@@ -285,9 +285,9 @@ export declare class MapMarkerClusterer implements OnInit, AfterContentInit, OnC
     set batchSizeIE(batchSizeIE: number);
     set calculator(calculator: Calculator);
     set clusterClass(clusterClass: string);
-    clusterClick: Observable<Cluster>;
-    clusteringbegin: Observable<void>;
-    clusteringend: Observable<void>;
+    readonly clusterClick: Observable<Cluster>;
+    readonly clusteringbegin: Observable<void>;
+    readonly clusteringend: Observable<void>;
     set enableRetinaIcons(enableRetinaIcons: boolean);
     set gridSize(gridSize: number);
     set ignoreHidden(ignoreHidden: boolean);
@@ -335,17 +335,17 @@ export declare class MapPolygon implements OnInit, OnDestroy {
     set options(options: google.maps.PolygonOptions);
     set paths(paths: google.maps.MVCArray<google.maps.MVCArray<google.maps.LatLng>> | google.maps.MVCArray<google.maps.LatLng> | google.maps.LatLng[] | google.maps.LatLngLiteral[]);
     polygon?: google.maps.Polygon;
-    polygonClick: Observable<google.maps.PolyMouseEvent>;
-    polygonDblclick: Observable<google.maps.PolyMouseEvent>;
-    polygonDrag: Observable<google.maps.MapMouseEvent>;
-    polygonDragend: Observable<google.maps.MapMouseEvent>;
-    polygonDragstart: Observable<google.maps.MapMouseEvent>;
-    polygonMousedown: Observable<google.maps.PolyMouseEvent>;
-    polygonMousemove: Observable<google.maps.PolyMouseEvent>;
-    polygonMouseout: Observable<google.maps.PolyMouseEvent>;
-    polygonMouseover: Observable<google.maps.PolyMouseEvent>;
-    polygonMouseup: Observable<google.maps.PolyMouseEvent>;
-    polygonRightclick: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonClick: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonDblclick: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonDrag: Observable<google.maps.MapMouseEvent>;
+    readonly polygonDragend: Observable<google.maps.MapMouseEvent>;
+    readonly polygonDragstart: Observable<google.maps.MapMouseEvent>;
+    readonly polygonMousedown: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonMousemove: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonMouseout: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonMouseover: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonMouseup: Observable<google.maps.PolyMouseEvent>;
+    readonly polygonRightclick: Observable<google.maps.PolyMouseEvent>;
     constructor(_map: GoogleMap, _ngZone: NgZone);
     getDraggable(): boolean;
     getEditable(): boolean;
@@ -362,17 +362,17 @@ export declare class MapPolyline implements OnInit, OnDestroy {
     set options(options: google.maps.PolylineOptions);
     set path(path: google.maps.MVCArray<google.maps.LatLng> | google.maps.LatLng[] | google.maps.LatLngLiteral[]);
     polyline?: google.maps.Polyline;
-    polylineClick: Observable<google.maps.PolyMouseEvent>;
-    polylineDblclick: Observable<google.maps.PolyMouseEvent>;
-    polylineDrag: Observable<google.maps.MapMouseEvent>;
-    polylineDragend: Observable<google.maps.MapMouseEvent>;
-    polylineDragstart: Observable<google.maps.MapMouseEvent>;
-    polylineMousedown: Observable<google.maps.PolyMouseEvent>;
-    polylineMousemove: Observable<google.maps.PolyMouseEvent>;
-    polylineMouseout: Observable<google.maps.PolyMouseEvent>;
-    polylineMouseover: Observable<google.maps.PolyMouseEvent>;
-    polylineMouseup: Observable<google.maps.PolyMouseEvent>;
-    polylineRightclick: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineClick: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineDblclick: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineDrag: Observable<google.maps.MapMouseEvent>;
+    readonly polylineDragend: Observable<google.maps.MapMouseEvent>;
+    readonly polylineDragstart: Observable<google.maps.MapMouseEvent>;
+    readonly polylineMousedown: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineMousemove: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineMouseout: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineMouseover: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineMouseup: Observable<google.maps.PolyMouseEvent>;
+    readonly polylineRightclick: Observable<google.maps.PolyMouseEvent>;
     constructor(_map: GoogleMap, _ngZone: NgZone);
     getDraggable(): boolean;
     getEditable(): boolean;
@@ -385,21 +385,20 @@ export declare class MapPolyline implements OnInit, OnDestroy {
 }
 
 export declare class MapRectangle implements OnInit, OnDestroy {
-    set bounds(bounds: google.maps.LatLngBounds | google.maps.LatLngBoundsLiteral);
-    boundsChanged: Observable<void>;
+    set bounds(bounds: google.maps.LatLngBounds | google.maps.LatLngBoundsLiteral); readonly boundsChanged: Observable<void>;
     set options(options: google.maps.RectangleOptions);
     rectangle?: google.maps.Rectangle;
-    rectangleClick: Observable<google.maps.MapMouseEvent>;
-    rectangleDblclick: Observable<google.maps.MapMouseEvent>;
-    rectangleDrag: Observable<google.maps.MapMouseEvent>;
-    rectangleDragend: Observable<google.maps.MapMouseEvent>;
-    rectangleDragstart: Observable<google.maps.MapMouseEvent>;
-    rectangleMousedown: Observable<google.maps.MapMouseEvent>;
-    rectangleMousemove: Observable<google.maps.MapMouseEvent>;
-    rectangleMouseout: Observable<google.maps.MapMouseEvent>;
-    rectangleMouseover: Observable<google.maps.MapMouseEvent>;
-    rectangleMouseup: Observable<google.maps.MapMouseEvent>;
-    rectangleRightclick: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleClick: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleDblclick: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleDrag: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleDragend: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleDragstart: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleMousedown: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleMousemove: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleMouseout: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleMouseover: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleMouseup: Observable<google.maps.MapMouseEvent>;
+    readonly rectangleRightclick: Observable<google.maps.MapMouseEvent>;
     constructor(_map: GoogleMap, _ngZone: NgZone);
     getBounds(): google.maps.LatLngBounds;
     getDraggable(): boolean;
diff --git a/tools/public_api_guard/material/chips.d.ts b/tools/public_api_guard/material/chips.d.ts
index a16fcaab933c..7aaa48f60efe 100644
--- a/tools/public_api_guard/material/chips.d.ts
+++ b/tools/public_api_guard/material/chips.d.ts
@@ -76,7 +76,7 @@ export declare class MatChipInput implements MatChipTextControl, OnChanges, OnDe
     protected _elementRef: ElementRef<HTMLInputElement>;
     get addOnBlur(): boolean;
     set addOnBlur(value: boolean);
-    chipEnd: EventEmitter<MatChipInputEvent>;
+    readonly chipEnd: EventEmitter<MatChipInputEvent>;
     set chipList(value: MatChipList);
     get disabled(): boolean;
     set disabled(value: boolean);
diff --git a/tools/public_api_guard/material/core.d.ts b/tools/public_api_guard/material/core.d.ts
index 946ad2717f76..563e8df321aa 100644
--- a/tools/public_api_guard/material/core.d.ts
+++ b/tools/public_api_guard/material/core.d.ts
@@ -86,7 +86,7 @@ export interface CanUpdateErrorState {
 export declare type CanUpdateErrorStateCtor = Constructor<CanUpdateErrorState>;
 
 export declare abstract class DateAdapter<D> {
-    protected _localeChanges: Subject<void>;
+    protected readonly _localeChanges: Subject<void>;
     protected locale: any;
     readonly localeChanges: Observable<void>;
     abstract addCalendarDays(date: D, days: number): D;
diff --git a/tools/public_api_guard/material/datepicker.d.ts b/tools/public_api_guard/material/datepicker.d.ts
index aa11d7b450f3..852bd5865761 100644
--- a/tools/public_api_guard/material/datepicker.d.ts
+++ b/tools/public_api_guard/material/datepicker.d.ts
@@ -76,7 +76,7 @@ export declare class MatCalendar<D> implements AfterContentInit, AfterViewChecke
     get startAt(): D | null;
     set startAt(value: D | null);
     startView: MatCalendarView;
-    stateChanges: Subject<void>;
+    readonly stateChanges: Subject<void>;
     readonly viewChanged: EventEmitter<MatCalendarView>;
     readonly yearSelected: EventEmitter<D>;
     yearView: MatYearView<D>;
@@ -108,7 +108,7 @@ export declare class MatCalendarBody implements OnChanges, OnDestroy {
     label: string;
     labelMinRequiredCells: number;
     numCols: number;
-    previewChange: EventEmitter<MatCalendarUserEvent<MatCalendarCell<any> | null>>;
+    readonly previewChange: EventEmitter<MatCalendarUserEvent<MatCalendarCell<any> | null>>;
     previewEnd: number | null;
     previewStart: number | null;
     rows: MatCalendarCell[][];
@@ -214,7 +214,7 @@ export declare class MatDatepickerCancel {
 
 export declare class MatDatepickerContent<S, D = ExtractDateTypeFromSelection<S>> extends _MatDatepickerContentMixinBase implements OnInit, AfterViewInit, OnDestroy, CanColor {
     _actionsPortal: TemplatePortal | null;
-    _animationDone: Subject<void>;
+    readonly _animationDone: Subject<void>;
     _animationState: 'enter' | 'void';
     _calendar: MatCalendar<D>;
     _closeButtonFocused: boolean;
@@ -348,7 +348,7 @@ export declare class MatDateRangeInput<D> implements MatFormFieldControl<DateRan
     set required(value: boolean);
     separator: string;
     get shouldLabelFloat(): boolean;
-    stateChanges: Subject<void>;
+    readonly stateChanges: Subject<void>;
     get value(): DateRange<D> | null;
     constructor(_changeDetectorRef: ChangeDetectorRef, _elementRef: ElementRef<HTMLElement>, control: ControlContainer, _dateAdapter: DateAdapter<D>, _formField?: MatFormField | undefined);
     _getAriaLabelledby(): string | null;
diff --git a/tools/public_api_guard/material/expansion.d.ts b/tools/public_api_guard/material/expansion.d.ts
index a7da048bf8c5..8fc37a6a4d55 100644
--- a/tools/public_api_guard/material/expansion.d.ts
+++ b/tools/public_api_guard/material/expansion.d.ts
@@ -45,14 +45,14 @@ export declare class MatExpansionModule {
 export declare class MatExpansionPanel extends CdkAccordionItem implements AfterContentInit, OnChanges, OnDestroy {
     _animationMode: string;
     _body: ElementRef<HTMLElement>;
-    _bodyAnimationDone: Subject<AnimationEvent>;
+    readonly _bodyAnimationDone: Subject<AnimationEvent>;
     _headerId: string;
     readonly _inputChanges: Subject<SimpleChanges>;
     _lazyContent: MatExpansionPanelContent;
     _portal: TemplatePortal;
     accordion: MatAccordionBase;
-    afterCollapse: EventEmitter<void>;
-    afterExpand: EventEmitter<void>;
+    readonly afterCollapse: EventEmitter<void>;
+    readonly afterExpand: EventEmitter<void>;
     get hideToggle(): boolean;
     set hideToggle(value: boolean);
     get togglePosition(): MatAccordionTogglePosition;
diff --git a/tools/public_api_guard/material/list.d.ts b/tools/public_api_guard/material/list.d.ts
index 78d29d3bc87e..f1f066901ffc 100644
--- a/tools/public_api_guard/material/list.d.ts
+++ b/tools/public_api_guard/material/list.d.ts
@@ -5,7 +5,7 @@ export declare const MAT_NAV_LIST: InjectionToken<MatNavList>;
 export declare const MAT_SELECTION_LIST_VALUE_ACCESSOR: any;
 
 export declare class MatList extends _MatListMixinBase implements CanDisable, CanDisableRipple, OnChanges, OnDestroy {
-    _stateChanges: Subject<void>;
+    readonly _stateChanges: Subject<void>;
     constructor(_elementRef: ElementRef<HTMLElement>);
     _getListType(): 'list' | 'action-list' | null;
     ngOnChanges(): void;
@@ -94,7 +94,7 @@ export declare class MatListSubheaderCssMatStyler {
 }
 
 export declare class MatNavList extends _MatListMixinBase implements CanDisable, CanDisableRipple, OnChanges, OnDestroy {
-    _stateChanges: Subject<void>;
+    readonly _stateChanges: Subject<void>;
     ngOnChanges(): void;
     ngOnDestroy(): void;
     static ngAcceptInputType_disableRipple: BooleanInput;
diff --git a/tools/public_api_guard/material/menu.d.ts b/tools/public_api_guard/material/menu.d.ts
index 20799e3c1f1d..f02e9aeb22ce 100644
--- a/tools/public_api_guard/material/menu.d.ts
+++ b/tools/public_api_guard/material/menu.d.ts
@@ -1,6 +1,6 @@
 export declare class _MatMenuBase implements AfterContentInit, MatMenuPanel<MatMenuItem>, OnInit, OnDestroy {
     _allItems: QueryList<MatMenuItem>;
-    _animationDone: Subject<AnimationEvent>;
+    readonly _animationDone: Subject<AnimationEvent>;
     _classList: {
         [key: string]: boolean;
     };
@@ -12,7 +12,7 @@ export declare class _MatMenuBase implements AfterContentInit, MatMenuPanel<MatM
     backdropClass: string;
     get classList(): string;
     set classList(classes: string);
-    close: EventEmitter<MenuCloseReason>;
+    readonly close: EventEmitter<MenuCloseReason>;
     readonly closed: EventEmitter<MenuCloseReason>;
     direction: Direction;
     get hasBackdrop(): boolean | undefined;
@@ -80,7 +80,7 @@ export declare const matMenuAnimations: {
 };
 
 export declare class MatMenuContent implements OnDestroy {
-    _attached: Subject<void>;
+    readonly _attached: Subject<void>;
     constructor(_template: TemplateRef<any>, _componentFactoryResolver: ComponentFactoryResolver, _appRef: ApplicationRef, _injector: Injector, _viewContainerRef: ViewContainerRef, _document: any, _changeDetectorRef?: ChangeDetectorRef | undefined);
     attach(context?: any): void;
     detach(): void;
@@ -130,7 +130,7 @@ export declare class MatMenuModule {
 export interface MatMenuPanel<T = any> {
     addItem?: (item: T) => void;
     backdropClass?: string;
-    close: EventEmitter<void | 'click' | 'keydown' | 'tab'>;
+    readonly close: EventEmitter<void | 'click' | 'keydown' | 'tab'>;
     direction?: Direction;
     focusFirstItem: (origin?: FocusOrigin) => void;
     hasBackdrop?: boolean;
diff --git a/tools/public_api_guard/material/progress-bar.d.ts b/tools/public_api_guard/material/progress-bar.d.ts
index 7d5f70043ccd..34999c4837ad 100644
--- a/tools/public_api_guard/material/progress-bar.d.ts
+++ b/tools/public_api_guard/material/progress-bar.d.ts
@@ -8,7 +8,7 @@ export declare class MatProgressBar extends _MatProgressBarMixinBase implements
     _isNoopAnimation: boolean;
     _primaryValueBar: ElementRef;
     _rectangleFillValue: string;
-    animationEnd: EventEmitter<ProgressAnimationEnd>;
+    readonly animationEnd: EventEmitter<ProgressAnimationEnd>;
     get bufferValue(): number;
     set bufferValue(v: number);
     mode: ProgressBarMode;
diff --git a/tools/public_api_guard/material/select.d.ts b/tools/public_api_guard/material/select.d.ts
index 7891e6f6a22c..43df3cedd4cd 100644
--- a/tools/public_api_guard/material/select.d.ts
+++ b/tools/public_api_guard/material/select.d.ts
@@ -10,7 +10,7 @@ export declare abstract class _MatSelectBase<C> extends _MatSelectMixinBase impl
     readonly _openedStream: Observable<void>;
     protected _overlayDir: CdkConnectedOverlay;
     _overlayPanelClass: string | string[];
-    _panelDoneAnimatingStream: Subject<string>;
+    readonly _panelDoneAnimatingStream: Subject<string>;
     protected _parentFormField: MatFormField;
     abstract _positions: ConnectedPosition[];
     _scrollStrategy: ScrollStrategy;
diff --git a/tools/public_api_guard/material/sidenav.d.ts b/tools/public_api_guard/material/sidenav.d.ts
index ec2bec85b5cb..dfa4945d4eec 100644
--- a/tools/public_api_guard/material/sidenav.d.ts
+++ b/tools/public_api_guard/material/sidenav.d.ts
@@ -3,13 +3,13 @@ export declare const MAT_DRAWER_DEFAULT_AUTOSIZE: InjectionToken<boolean>;
 export declare function MAT_DRAWER_DEFAULT_AUTOSIZE_FACTORY(): boolean;
 
 export declare class MatDrawer implements AfterContentInit, AfterContentChecked, OnDestroy {
-    _animationEnd: Subject<AnimationEvent>;
-    _animationStarted: Subject<AnimationEvent>;
+    readonly _animationEnd: Subject<AnimationEvent>;
+    readonly _animationStarted: Subject<AnimationEvent>;
     _animationState: 'open-instant' | 'open' | 'void';
-    _closedStream: Observable<void>;
+    readonly _closedStream: Observable<void>;
     _container?: MatDrawerContainer | undefined;
     readonly _modeChanged: Subject<void>;
-    _openedStream: Observable<void>;
+    readonly _openedStream: Observable<void>;
     get autoFocus(): boolean;
     set autoFocus(value: boolean);
     readonly closedStart: Observable<void>;
@@ -17,7 +17,7 @@ export declare class MatDrawer implements AfterContentInit, AfterContentChecked,
     set disableClose(value: boolean);
     get mode(): MatDrawerMode;
     set mode(value: MatDrawerMode);
-    onPositionChanged: EventEmitter<void>;
+    readonly onPositionChanged: EventEmitter<void>;
     get opened(): boolean;
     set opened(value: boolean);
     readonly openedChange: EventEmitter<boolean>;
diff --git a/tools/public_api_guard/material/snack-bar.d.ts b/tools/public_api_guard/material/snack-bar.d.ts
index 8dc6e77da419..12d982c3a64e 100644
--- a/tools/public_api_guard/material/snack-bar.d.ts
+++ b/tools/public_api_guard/material/snack-bar.d.ts
@@ -1,7 +1,7 @@
 export interface _SnackBarContainer {
-    _onAnnounce: Subject<any>;
-    _onEnter: Subject<any>;
-    _onExit: Subject<any>;
+    readonly _onAnnounce: Subject<any>;
+    readonly _onEnter: Subject<any>;
+    readonly _onExit: Subject<any>;
     attachComponentPortal: <T>(portal: ComponentPortal<T>) => ComponentRef<T>;
     attachTemplatePortal: <C>(portal: TemplatePortal<C>) => EmbeddedViewRef<C>;
     enter: () => void;
diff --git a/tools/public_api_guard/material/stepper.d.ts b/tools/public_api_guard/material/stepper.d.ts
index 9ac07679ade8..f1d3e1bf8f25 100644
--- a/tools/public_api_guard/material/stepper.d.ts
+++ b/tools/public_api_guard/material/stepper.d.ts
@@ -63,7 +63,7 @@ export declare class MatStepLabel extends CdkStepLabel {
 }
 
 export declare class MatStepper extends CdkStepper implements AfterContentInit {
-    _animationDone: Subject<AnimationEvent>;
+    readonly _animationDone: Subject<AnimationEvent>;
     _iconOverrides: Record<string, TemplateRef<MatStepperIconContext>>;
     _icons: QueryList<MatStepperIcon>;
     _stepHeader: QueryList<MatStepHeader>;
diff --git a/tools/public_api_guard/material/tabs.d.ts b/tools/public_api_guard/material/tabs.d.ts
index ac4ec693b509..54911b94e64f 100644
--- a/tools/public_api_guard/material/tabs.d.ts
+++ b/tools/public_api_guard/material/tabs.d.ts
@@ -15,7 +15,7 @@ export declare abstract class _MatTabBodyBase implements OnInit, OnDestroy {
     readonly _onCentering: EventEmitter<number>;
     abstract _portalHost: CdkPortalOutlet;
     _position: MatTabBodyPositionState;
-    _translateTabComplete: Subject<AnimationEvent>;
+    readonly _translateTabComplete: Subject<AnimationEvent>;
     animationDuration: string;
     origin: number | null;
     set position(position: number);
diff --git a/tools/public_api_guard/material/tree.d.ts b/tools/public_api_guard/material/tree.d.ts
index bee59568641a..0436f8cc00ab 100644
--- a/tools/public_api_guard/material/tree.d.ts
+++ b/tools/public_api_guard/material/tree.d.ts
@@ -24,9 +24,9 @@ export declare class MatTree<T, K = T> extends CdkTree<T, K> {
 }
 
 export declare class MatTreeFlatDataSource<T, F, K = F> extends DataSource<F> {
-    _data: BehaviorSubject<T[]>;
-    _expandedData: BehaviorSubject<F[]>;
-    _flattenedData: BehaviorSubject<F[]>;
+    readonly _data: BehaviorSubject<T[]>;
+    readonly _expandedData: BehaviorSubject<F[]>;
+    readonly _flattenedData: BehaviorSubject<F[]>;
     get data(): T[];
     set data(value: T[]);
     constructor(_treeControl: FlatTreeControl<F, K>, _treeFlattener: MatTreeFlattener<T, F, K>, initialData?: T[]);
@@ -53,7 +53,7 @@ export declare class MatTreeModule {
 }
 
 export declare class MatTreeNestedDataSource<T> extends DataSource<T> {
-    _data: BehaviorSubject<T[]>;
+    readonly _data: BehaviorSubject<T[]>;
     get data(): T[];
     set data(value: T[]);
     connect(collectionViewer: CollectionViewer): Observable<T[]>;
diff --git a/tools/public_api_guard/youtube-player/youtube-player.d.ts b/tools/public_api_guard/youtube-player/youtube-player.d.ts
index 785a58aed048..fc4f1917743a 100644
--- a/tools/public_api_guard/youtube-player/youtube-player.d.ts
+++ b/tools/public_api_guard/youtube-player/youtube-player.d.ts
@@ -1,17 +1,17 @@
 export declare class YouTubePlayer implements AfterViewInit, OnDestroy, OnInit {
-    apiChange: Observable<YT.PlayerEvent>;
+    readonly apiChange: Observable<YT.PlayerEvent>;
     set endSeconds(endSeconds: number | undefined);
-    error: Observable<YT.OnErrorEvent>;
+    readonly error: Observable<YT.OnErrorEvent>;
     get height(): number | undefined;
     set height(height: number | undefined);
-    playbackQualityChange: Observable<YT.OnPlaybackQualityChangeEvent>;
-    playbackRateChange: Observable<YT.OnPlaybackRateChangeEvent>;
+    readonly playbackQualityChange: Observable<YT.OnPlaybackQualityChangeEvent>;
+    readonly playbackRateChange: Observable<YT.OnPlaybackRateChangeEvent>;
     get playerVars(): YT.PlayerVars | undefined;
     set playerVars(playerVars: YT.PlayerVars | undefined);
-    ready: Observable<YT.PlayerEvent>;
+    readonly ready: Observable<YT.PlayerEvent>;
     showBeforeIframeApiLoads: boolean | undefined;
     set startSeconds(startSeconds: number | undefined);
-    stateChange: Observable<YT.OnStateChangeEvent>;
+    readonly stateChange: Observable<YT.OnStateChangeEvent>;
     set suggestedQuality(suggestedQuality: YT.SuggestedVideoQuality | undefined);
     get videoId(): string | undefined;
     set videoId(videoId: string | undefined);
diff --git a/tslint.json b/tslint.json
index a48d43c80a20..2a854c9d1924 100644
--- a/tslint.json
+++ b/tslint.json
@@ -115,6 +115,7 @@
     "contextual-lifecycle": true,
     "contextual-decorator": true,
     "no-output-on-prefix": true,
+    "prefer-output-readonly": true,
     "template-no-negated-async": true,
     "use-lifecycle-interface": true,