refactor: allow coercion inputs to work with async pipe (#17640)

We need to accept `null` and `undefined` for coercion members
to make them work with the `async` pipe. The overall problem
remains for other non-coercion inputs, but since the majority
of inputs are coerced, we only make the change to these.

The overall problem applies to _all_ inputs, but it's not clear
yet how this issue can be solved for all inputs. This involves
discussion with the framework team.

More information: https://hackmd.io/@devversion/rkKOD8ZjB

Author: devversion

src/cdk-experimental/scrolling/auto-size-virtual-scroll.ts

@@ -464,6 +464,6 @@ export class CdkAutoSizeVirtualScroll implements OnChanges {
     this._scrollStrategy.updateBufferSize(this.minBufferPx, this.maxBufferPx);
   }
 
-  static ngAcceptInputType_minBufferPx: number | string;
-  static ngAcceptInputType_maxBufferPx: number | string;
+  static ngAcceptInputType_minBufferPx: number | string | null | undefined;
+  static ngAcceptInputType_maxBufferPx: number | string | null | undefined;
 }

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

@@ -419,6 +419,6 @@ export class CdkTrapFocus implements OnDestroy, AfterContentInit, DoCheck {
     }
   }
 
-  static ngAcceptInputType_enabled: boolean | string;
-  static ngAcceptInputType_autoCapture: boolean | string;
+  static ngAcceptInputType_enabled: boolean | string | null | undefined;
+  static ngAcceptInputType_autoCapture: boolean | string | null | undefined;
 }

src/cdk/accordion/accordion-item.ts

@@ -153,6 +153,6 @@ export class CdkAccordionItem implements OnDestroy {
     });
   }
 
-  static ngAcceptInputType_expanded: boolean | string;
-  static ngAcceptInputType_disabled: boolean | string;
+  static ngAcceptInputType_expanded: boolean | string | null | undefined;
+  static ngAcceptInputType_disabled: boolean | string | null | undefined;
 }

src/cdk/accordion/accordion.ts

@@ -60,5 +60,5 @@ export class CdkAccordion implements OnDestroy, OnChanges {
     }
   }
 
-  static ngAcceptInputType_multi: boolean | string;
+  static ngAcceptInputType_multi: boolean | string | null | undefined;
 }

src/cdk/drag-drop/directives/drag-handle.ts

@@ -47,5 +47,5 @@ export class CdkDragHandle implements OnDestroy {
     this._stateChanges.complete();
   }
 
-  static ngAcceptInputType_disabled: boolean | string;
+  static ngAcceptInputType_disabled: boolean | string | null | undefined;
 }

src/cdk/drag-drop/directives/drag.ts

@@ -409,7 +409,7 @@ export class CdkDrag<T = any> implements AfterViewInit, OnChanges, OnDestroy {
     });
   }
 
-  static ngAcceptInputType_disabled: boolean | string;
+  static ngAcceptInputType_disabled: boolean | string | null | undefined;
 }
 
 /** Gets the closest ancestor of an element that matches a selector. */

src/cdk/drag-drop/directives/drop-list-group.ts

@@ -35,5 +35,5 @@ export class CdkDropListGroup<T> implements OnDestroy {
     this._items.clear();
   }
 
-  static ngAcceptInputType_disabled: boolean | string;
+  static ngAcceptInputType_disabled: boolean | string | null | undefined;
 }

src/cdk/drag-drop/directives/drop-list.ts

@@ -328,7 +328,7 @@ export class CdkDropList<T = any> implements AfterContentInit, OnDestroy {
     });
   }
 
-  static ngAcceptInputType_disabled: boolean | string;
-  static ngAcceptInputType_sortingDisabled: boolean | string;
-  static ngAcceptInputType_autoScrollDisabled: boolean | string;
+  static ngAcceptInputType_disabled: boolean | string | null | undefined;
+  static ngAcceptInputType_sortingDisabled: boolean | string | null | undefined;
+  static ngAcceptInputType_autoScrollDisabled: boolean | string | null | undefined;
 }

src/cdk/observers/observe-content.ts

@@ -194,8 +194,8 @@ export class CdkObserveContent implements AfterContentInit, OnDestroy {
     }
   }
 
-  static ngAcceptInputType_disabled: boolean | string;
-  static ngAcceptInputType_debounce: boolean | string;
+  static ngAcceptInputType_disabled: boolean | string | null | undefined;
+  static ngAcceptInputType_debounce: boolean | string | null | undefined;
 }
 
 

src/cdk/overlay/overlay-directives.ts

@@ -384,11 +384,11 @@ export class CdkConnectedOverlay implements OnDestroy, OnChanges {
     this._backdropSubscription.unsubscribe();
   }
 
-  static ngAcceptInputType_hasBackdrop: boolean | string;
-  static ngAcceptInputType_lockPosition: boolean | string;
-  static ngAcceptInputType_flexibleDimensions: boolean | string;
-  static ngAcceptInputType_growAfterOpen: boolean | string;
-  static ngAcceptInputType_push: boolean | string;
+  static ngAcceptInputType_hasBackdrop: boolean | string | null | undefined;
+  static ngAcceptInputType_lockPosition: boolean | string | null | undefined;
+  static ngAcceptInputType_flexibleDimensions: boolean | string | null | undefined;
+  static ngAcceptInputType_growAfterOpen: boolean | string | null | undefined;
+  static ngAcceptInputType_push: boolean | string | null | undefined;
 }