211 lines
9.4 KiB
JavaScript
Executable File
211 lines
9.4 KiB
JavaScript
Executable File
import * as i0 from '@angular/core';
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import { Injectable, inject, NgZone, ElementRef, EventEmitter, booleanAttribute, Directive, Output, Input, NgModule } from '@angular/core';
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import { Observable, Subject } from 'rxjs';
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import { map, filter, debounceTime } from 'rxjs/operators';
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import { coerceNumberProperty, coerceElement } from './element.mjs';
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// Angular may add, remove, or edit comment nodes during change detection. We don't care about
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// these changes because they don't affect the user-preceived content, and worse it can cause
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// infinite change detection cycles where the change detection updates a comment, triggering the
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// MutationObserver, triggering another change detection and kicking the cycle off again.
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function shouldIgnoreRecord(record) {
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// Ignore changes to comment text.
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if (record.type === 'characterData' && record.target instanceof Comment) {
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return true;
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}
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// Ignore addition / removal of comments.
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if (record.type === 'childList') {
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for (let i = 0; i < record.addedNodes.length; i++) {
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if (!(record.addedNodes[i] instanceof Comment)) {
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return false;
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}
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}
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for (let i = 0; i < record.removedNodes.length; i++) {
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if (!(record.removedNodes[i] instanceof Comment)) {
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return false;
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}
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}
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return true;
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}
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// Observe everything else.
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return false;
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}
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/**
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* Factory that creates a new MutationObserver and allows us to stub it out in unit tests.
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* @docs-private
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*/
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class MutationObserverFactory {
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create(callback) {
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return typeof MutationObserver === 'undefined' ? null : new MutationObserver(callback);
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}
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static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: MutationObserverFactory, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
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static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: MutationObserverFactory, providedIn: 'root' });
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}
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i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: MutationObserverFactory, decorators: [{
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type: Injectable,
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args: [{ providedIn: 'root' }]
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}] });
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/** An injectable service that allows watching elements for changes to their content. */
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class ContentObserver {
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_mutationObserverFactory = inject(MutationObserverFactory);
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/** Keeps track of the existing MutationObservers so they can be reused. */
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_observedElements = new Map();
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_ngZone = inject(NgZone);
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constructor() { }
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ngOnDestroy() {
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this._observedElements.forEach((_, element) => this._cleanupObserver(element));
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}
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observe(elementOrRef) {
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const element = coerceElement(elementOrRef);
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return new Observable((observer) => {
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const stream = this._observeElement(element);
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const subscription = stream
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.pipe(map(records => records.filter(record => !shouldIgnoreRecord(record))), filter(records => !!records.length))
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.subscribe(records => {
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this._ngZone.run(() => {
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observer.next(records);
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});
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});
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return () => {
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subscription.unsubscribe();
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this._unobserveElement(element);
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};
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});
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}
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/**
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* Observes the given element by using the existing MutationObserver if available, or creating a
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* new one if not.
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*/
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_observeElement(element) {
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return this._ngZone.runOutsideAngular(() => {
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if (!this._observedElements.has(element)) {
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const stream = new Subject();
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const observer = this._mutationObserverFactory.create(mutations => stream.next(mutations));
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if (observer) {
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observer.observe(element, {
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characterData: true,
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childList: true,
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subtree: true,
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});
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}
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this._observedElements.set(element, { observer, stream, count: 1 });
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}
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else {
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this._observedElements.get(element).count++;
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}
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return this._observedElements.get(element).stream;
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});
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}
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/**
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* Un-observes the given element and cleans up the underlying MutationObserver if nobody else is
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* observing this element.
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*/
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_unobserveElement(element) {
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if (this._observedElements.has(element)) {
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this._observedElements.get(element).count--;
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if (!this._observedElements.get(element).count) {
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this._cleanupObserver(element);
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}
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}
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}
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/** Clean up the underlying MutationObserver for the specified element. */
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_cleanupObserver(element) {
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if (this._observedElements.has(element)) {
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const { observer, stream } = this._observedElements.get(element);
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if (observer) {
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observer.disconnect();
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}
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stream.complete();
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this._observedElements.delete(element);
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}
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}
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static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: ContentObserver, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
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static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: ContentObserver, providedIn: 'root' });
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}
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i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: ContentObserver, decorators: [{
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type: Injectable,
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args: [{ providedIn: 'root' }]
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}], ctorParameters: () => [] });
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/**
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* Directive that triggers a callback whenever the content of
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* its associated element has changed.
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*/
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class CdkObserveContent {
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_contentObserver = inject(ContentObserver);
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_elementRef = inject(ElementRef);
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/** Event emitted for each change in the element's content. */
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event = new EventEmitter();
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/**
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* Whether observing content is disabled. This option can be used
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* to disconnect the underlying MutationObserver until it is needed.
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*/
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get disabled() {
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return this._disabled;
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}
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set disabled(value) {
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this._disabled = value;
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this._disabled ? this._unsubscribe() : this._subscribe();
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}
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_disabled = false;
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/** Debounce interval for emitting the changes. */
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get debounce() {
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return this._debounce;
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}
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set debounce(value) {
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this._debounce = coerceNumberProperty(value);
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this._subscribe();
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}
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_debounce;
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_currentSubscription = null;
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constructor() { }
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ngAfterContentInit() {
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if (!this._currentSubscription && !this.disabled) {
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this._subscribe();
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}
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}
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ngOnDestroy() {
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this._unsubscribe();
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}
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_subscribe() {
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this._unsubscribe();
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const stream = this._contentObserver.observe(this._elementRef);
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this._currentSubscription = (this.debounce ? stream.pipe(debounceTime(this.debounce)) : stream).subscribe(this.event);
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}
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_unsubscribe() {
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this._currentSubscription?.unsubscribe();
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}
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static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: CdkObserveContent, deps: [], target: i0.ɵɵFactoryTarget.Directive });
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static ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "16.1.0", version: "20.2.0-next.2", type: CdkObserveContent, isStandalone: true, selector: "[cdkObserveContent]", inputs: { disabled: ["cdkObserveContentDisabled", "disabled", booleanAttribute], debounce: "debounce" }, outputs: { event: "cdkObserveContent" }, exportAs: ["cdkObserveContent"], ngImport: i0 });
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}
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i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: CdkObserveContent, decorators: [{
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type: Directive,
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args: [{
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selector: '[cdkObserveContent]',
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exportAs: 'cdkObserveContent',
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}]
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}], ctorParameters: () => [], propDecorators: { event: [{
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type: Output,
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args: ['cdkObserveContent']
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}], disabled: [{
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type: Input,
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args: [{ alias: 'cdkObserveContentDisabled', transform: booleanAttribute }]
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}], debounce: [{
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type: Input
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}] } });
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class ObserversModule {
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static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: ObserversModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
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static ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "20.2.0-next.2", ngImport: i0, type: ObserversModule, imports: [CdkObserveContent], exports: [CdkObserveContent] });
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static ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: ObserversModule, providers: [MutationObserverFactory] });
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}
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i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "20.2.0-next.2", ngImport: i0, type: ObserversModule, decorators: [{
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type: NgModule,
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args: [{
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imports: [CdkObserveContent],
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exports: [CdkObserveContent],
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providers: [MutationObserverFactory],
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}]
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}] });
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export { CdkObserveContent, ContentObserver, MutationObserverFactory, ObserversModule };
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//# sourceMappingURL=observers.mjs.map
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