refactor(multiple): clean up usages of DOCUMENT (#31461)

We had several places that were optionally injecting `DOCUMENT`, because historically it wasn't guaranteed to be there. That shouldn't be the case anymore so we can clean them up.

(cherry picked from commit a6a385c)

Author: crisbeto

goldens/cdk/a11y/index.api.md

@@ -175,7 +175,7 @@ export class FocusKeyManager<T> extends ListKeyManager<FocusableOption & T> {
 // @public
 export class FocusMonitor implements OnDestroy {
     constructor(...args: unknown[]);
-    protected _document?: Document | null | undefined;
+    protected _document: Document;
     focusVia(element: HTMLElement, origin: FocusOrigin, options?: FocusOptions_2): void;
     focusVia(element: ElementRef<HTMLElement>, origin: FocusOrigin, options?: FocusOptions_2): void;
     monitor(element: HTMLElement, checkChildren?: boolean): Observable<FocusOrigin>;

goldens/cdk/text-field/index.api.md

@@ -51,7 +51,7 @@ export class CdkAutofill implements OnDestroy, OnInit {
 // @public
 export class CdkTextareaAutosize implements AfterViewInit, DoCheck, OnDestroy {
     constructor(...args: unknown[]);
-    protected _document?: Document | null | undefined;
+    protected _document: Document;
     get enabled(): boolean;
     set enabled(value: boolean);
     get maxRows(): number;

src/cdk/a11y/focus-monitor/focus-monitor.ts

@@ -142,7 +142,7 @@ export class FocusMonitor implements OnDestroy {
   };
 
   /** Used to reference correct document/window */
-  protected _document? = inject(DOCUMENT, {optional: true});
+  protected _document = inject(DOCUMENT);
 
   /** Subject for stopping our InputModalityDetector subscription. */
   private readonly _stopInputModalityDetector = new Subject<void>();
@@ -206,7 +206,7 @@ export class FocusMonitor implements OnDestroy {
     // If the element is inside the shadow DOM, we need to bind our focus/blur listeners to
     // the shadow root, rather than the `document`, because the browser won't emit focus events
     // to the `document`, if focus is moving within the same shadow root.
-    const rootNode = _getShadowRoot(nativeElement) || this._getDocument();
+    const rootNode = _getShadowRoot(nativeElement) || this._document;
     const cachedInfo = this._elementInfo.get(nativeElement);
 
     // Check if we're already monitoring this element.
@@ -280,7 +280,7 @@ export class FocusMonitor implements OnDestroy {
     options?: FocusOptions,
   ): void {
     const nativeElement = coerceElement(element);
-    const focusedElement = this._getDocument().activeElement;
+    const focusedElement = this._document.activeElement;
 
     // If the element is focused already, calling `focus` again won't trigger the event listener
     // which means that the focus classes won't be updated. If that's the case, update the classes
@@ -303,15 +303,9 @@ export class FocusMonitor implements OnDestroy {
     this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));
   }
 
-  /** Access injected document if available or fallback to global document reference */
-  private _getDocument(): Document {
-    return this._document || document;
-  }
-
   /** Use defaultView of injected document if available or fallback to global window reference */
   private _getWindow(): Window {
-    const doc = this._getDocument();
-    return doc.defaultView || window;
+    return this._document.defaultView || window;
   }
 
   private _getFocusOrigin(focusEventTarget: HTMLElement | null): FocusOrigin {

src/cdk/dialog/dialog-container.ts

@@ -82,7 +82,7 @@ export class CdkDialogContainer<C extends DialogConfig = DialogConfig>
   private _renderer = inject(Renderer2);
 
   private _platform = inject(Platform);
-  protected _document = inject(DOCUMENT, {optional: true})!;
+  protected _document = inject(DOCUMENT);
 
   /** The portal outlet inside of this container into which the dialog content will be loaded. */
   @ViewChild(CdkPortalOutlet, {static: true}) _portalOutlet: CdkPortalOutlet;

src/cdk/scrolling/viewport-ruler.ts

@@ -36,7 +36,7 @@ export class ViewportRuler implements OnDestroy {
   private readonly _change = new Subject<Event>();
 
   /** Used to reference correct document/window */
-  protected _document = inject(DOCUMENT, {optional: true})!;
+  protected _document = inject(DOCUMENT);
 
   constructor(...args: unknown[]);
 

src/cdk/text-field/autosize.ts

@@ -122,7 +122,7 @@ export class CdkTextareaAutosize implements AfterViewInit, DoCheck, OnDestroy {
   private _cachedScrollTop: number;
 
   /** Used to reference correct document/window */
-  protected _document? = inject(DOCUMENT, {optional: true});
+  protected _document = inject(DOCUMENT);
 
   private _hasFocus: boolean;
 

src/material/sidenav/drawer.ts

@@ -182,7 +182,7 @@ export class MatDrawer implements AfterViewInit, OnDestroy {
   private _ngZone = inject(NgZone);
   private _renderer = inject(Renderer2);
   private readonly _interactivityChecker = inject(InteractivityChecker);
-  private _doc = inject(DOCUMENT, {optional: true})!;
+  private _doc = inject(DOCUMENT);
   _container? = inject<MatDrawerContainer>(MAT_DRAWER_CONTAINER, {optional: true});
 
   private _focusTrap: FocusTrap | null = null;
@@ -347,9 +347,7 @@ export class MatDrawer implements AfterViewInit, OnDestroy {
   constructor() {
     this.openedChange.pipe(takeUntil(this._destroyed)).subscribe((opened: boolean) => {
       if (opened) {
-        if (this._doc) {
-          this._elementFocusedBeforeDrawerWasOpened = this._doc.activeElement as HTMLElement;
-        }
+        this._elementFocusedBeforeDrawerWasOpened = this._doc.activeElement as HTMLElement;
         this._takeFocus();
       } else if (this._isFocusWithinDrawer()) {
         this._restoreFocus(this._openedVia || 'program');