feat(angular): strongly type Ionic lifecycle hooks (#18044)

closes #18043

angular/src/index.ts

@@ -36,6 +36,9 @@ export { GestureController } from './providers/gesture-controller';
 // ROUTER STRATEGY
 export { IonicRouteStrategy } from './util/ionic-router-reuse-strategy';
 
+// TYPES
+export * from './types/ionic-lifecycle-hooks';
+
 // PACKAGE MODULE
 export { IonicModule } from './ionic-module';
 

angular/src/types/ionic-lifecycle-hooks.ts

@@ -0,0 +1,31 @@
+/**
+ *  https://ionicframework.com/docs/api/router-outlet#life-cycle-hooks
+ */
+
+export interface ViewWillEnter {
+  /**
+   * Fired when the component routing to is about to animate into view.
+   */
+  ionViewWillEnter(): void;
+}
+
+export interface ViewDidEnter {
+  /**
+   * Fired when the component routing to has finished animating.
+   */
+  ionViewDidEnter(): void;
+}
+
+export interface ViewWillLeave {
+  /**
+   * Fired when the component routing from is about to animate.
+   */
+  ionViewWillLeave(): void;
+}
+
+export interface ViewDidLeave {
+  /**
+   * Fired when the component routing to has finished animating.
+   */
+  ionViewDidLeave(): void;
+}