fix(angular): backButton event uses ionBackButton

angular/src/providers/platform.ts

@@ -1,5 +1,5 @@
 import { EventEmitter, Injectable } from '@angular/core';
-import { Platforms, getPlatforms, isPlatform } from '@ionic/core';
+import { BackButtonDetail, Platforms, getPlatforms, isPlatform } from '@ionic/core';
 import { proxyEvent } from '../util/util';
 
 
@@ -11,34 +11,34 @@ export class Platform {
   /**
    * @hidden
    */
-  backButton = new EventEmitter<Event>();
+  backButton = new EventEmitter<BackButtonDetail>();
 
   /**
    * The pause event emits when the native platform puts the application
    * into the background, typically when the user switches to a different
    * application. This event would emit when a Cordova app is put into
    * the background, however, it would not fire on a standard web browser.
    */
-  pause = new EventEmitter<Event>();
+  pause = new EventEmitter<void>();
 
   /**
    * The resume event emits when the native platform pulls the application
    * out from the background. This event would emit when a Cordova app comes
    * out from the background, however, it would not fire on a standard web browser.
    */
-  resume = new EventEmitter<Event>();
+  resume = new EventEmitter<void>();
 
   /**
    * The resize event emits when the browser window has changed dimensions. This
    * could be from a browser window being physically resized, or from a device
    * changing orientation.
    */
-  resize = new EventEmitter<Event>();
+  resize = new EventEmitter<void>();
 
   constructor() {
     proxyEvent(this.pause, document, 'pause');
     proxyEvent(this.resume, document, 'resume');
-    proxyEvent(this.backButton, document, 'backbutton');
+    proxyEvent(this.backButton, document, 'ionBackButton');
     proxyEvent(this.resize, window, 'resize');
 
     let readyResolve: (value: string) => void;

angular/src/util/util.ts

@@ -1,4 +1,4 @@
-import { ElementRef } from '@angular/core';
+import { ElementRef, EventEmitter } from '@angular/core';
 
 export function inputs(instance: any, el: ElementRef, props: string[]) {
   props.forEach(propName => {
@@ -8,9 +8,9 @@ export function inputs(instance: any, el: ElementRef, props: string[]) {
   });
 }
 
-export function proxyEvent(emitter: any, el: EventTarget, eventName: string) {
+export function proxyEvent<T>(emitter: EventEmitter<T>, el: EventTarget, eventName: string) {
   el.addEventListener(eventName, (ev) => {
-    emitter.emit(ev);
+    emitter.emit((ev as any).detail as T);
   });
 }
 

core/src/interface.d.ts

@@ -40,9 +40,11 @@ export type ComponentTags = keyof StencilIntrinsicElements;
 export type ComponentRef = Function | HTMLElement | string | null;
 export type ComponentProps<T = null> = T extends ComponentTags ? StencilIntrinsicElements[T] : {[key: string]: any};
 export type CssClassMap = { [className: string]: boolean };
-export type BackButtonEvent = CustomEvent<{
+export interface BackButtonDetail {
   register(priority: number, handler: () => Promise<any> | void): void;
-}>
+}
+
+export type BackButtonEvent = CustomEvent<BackButtonDetail>;
 
 export interface FrameworkDelegate {
   attachViewToDom(container: any, component: any, propsOrDataObj?: any, cssClasses?: string[]): Promise<HTMLElement>;