feat(IonicErrorHandler): custom ionic error handler provider

src/util/ionic-error-handler.ts

@@ -1,14 +1,56 @@
+import { ErrorHandler } from '@angular/core';
+
 /**
- * This class is an internal error handler for Ionic. We can often add
- * some nice goodies to the dev/debugging process by reporting to our
- * dev server. To use this class, call `IonicErrorHandler.handleError(err)` from
- * inside a custom `ErrorHandler` as described here: https://angular.io/docs/ts/latest/api/core/index/ErrorHandler-class.html
+ * The `IonicErrorHandler` intercepts the default `Console` error handling
+ * and displays runtime errors as an overlay when using Ionic's Dev Build Server.
+ * We can often add some nice goodies to the dev/debugging process by reporting
+ * to our dev server and improving the error's readability.
+ *
+ *
+ * ### IonicErrorHandler Example
+ *
+ * ```typescript
+ * import { NgModule, ErrorHandler } from '@angular/core';
+ * import { IonicErrorHandler } from 'ionic-angular';
+ *
+ * @NgModule({
+ *   providers: [{ provide: ErrorHandler, useClass: IonicErrorHandler }]
+ * })
+ * class AppModule {}
+ * ```
+ *
+ *
+ * ### Custom Error Handlers
+ *
+ * Custom error handlers can be built to replace the default, or extend Ionic's
+ * error handler.
+ *
+ * ```typescript
+ * class MyErrorHandler implements ErrorHandler {
+ *   handleError(err: any): void {
+ *     // do something with the error
+ *   }
+ * }
+ *
+ * @NgModule({
+ *   providers: [{ provide: ErrorHandler, useClass: MyErrorHandler }]
+ * })
+ * class AppModule {}
+ * ```
+ *
+ * More information about Angular's [`ErrorHandler`](https://angular.io/docs/ts/latest/api/core/index/ErrorHandler-class.html).
  */
-export class IonicErrorHandler {
-  static handleError(err: any): void {
-    let server = window['IonicDevServer'];
-    if (server) {
-      server.handleError(err);
-    }
+export class IonicErrorHandler extends ErrorHandler {
+  constructor() {
+    super(false);
+  }
+  handleError(err: any): void {
+    super.handleError(err);
+    try {
+      const devServer = window['IonicDevServer'];
+      if (devServer) {
+        devServer.handleError(err);
+      }
+    } catch (e) {}
   }
 }