fix(modal): pass modalRef as an argument into beforeDismiss callback

Fixes ng-bootstrap#3464

src/modal/modal-config.ts

@@ -1,10 +1,11 @@
 import { Injectable, Injector } from '@angular/core';
 import { NgbConfig } from '../ngb-config';
+import { NgbModalRef } from './modal-ref';
 
 /**
  * Options available when opening new modal windows with `NgbModal.open()` method.
  */
-export interface NgbModalOptions {
+export interface NgbModalOptions<T = any> {
 	/**
 	 * If `true`, modal opening and closing will be animated.
 	 *
@@ -45,7 +46,7 @@ export interface NgbModalOptions {
 	 *
 	 * then the modal won't be dismissed.
 	 */
-	beforeDismiss?: () => boolean | Promise<boolean>;
+	beforeDismiss?: (modalRef: NgbModalRef<T>) => boolean | Promise<boolean>;
 
 	/**
 	 * If `true`, the modal will be centered vertically.
@@ -151,7 +152,7 @@ export class NgbModalConfig implements Required<NgbModalOptions> {
 	ariaLabelledBy: string;
 	ariaDescribedBy: string;
 	backdrop: boolean | 'static' = true;
-	beforeDismiss: () => boolean | Promise<boolean>;
+	beforeDismiss: (modalRef: NgbModalRef<any>) => boolean | Promise<boolean>;
 	centered: boolean;
 	container: string | HTMLElement;
 	fullscreen: 'sm' | 'md' | 'lg' | 'xl' | 'xxl' | boolean | string = false;

src/modal/modal-ref.ts

@@ -160,7 +160,7 @@ export class NgbModalRef<T = any> {
 		private _windowCmptRef: ComponentRef<NgbModalWindow>,
 		private _contentRef: ContentRef,
 		private _backdropCmptRef?: ComponentRef<NgbModalBackdrop>,
-		private _beforeDismiss?: () => boolean | Promise<boolean>,
+		private _beforeDismiss?: (modalRef: NgbModalRef<any>) => boolean | Promise<boolean>,
 	) {
 		_windowCmptRef.instance.dismissEvent.subscribe((reason: any) => {
 			this.dismiss(reason);
@@ -202,7 +202,7 @@ export class NgbModalRef<T = any> {
 			if (!this._beforeDismiss) {
 				this._dismiss(reason);
 			} else {
-				const dismiss = this._beforeDismiss();
+				const dismiss = this._beforeDismiss(this);
 				if (isPromise(dismiss)) {
 					dismiss.then(
 						(result) => {

src/modal/modal.ts

@@ -23,7 +23,7 @@ export class NgbModal {
 	 *
 	 * Also see the [`NgbModalOptions`](#/components/modal/api#NgbModalOptions) for the list of supported options.
 	 */
-	open<T>(content: T, options: NgbModalOptions = {}): NgbModalRef<T> {
+	open<T>(content: T, options: NgbModalOptions<T> = {}): NgbModalRef<T> {
 		const combinedOptions = { ...this._config, animation: this._config.animation, ...options };
 		return this._modalStack.open(this._injector, content, combinedOptions);
 	}