sendEvent function is not getting called in angular nativescript application


Trying to capture UIEvents in ios nativescript app
SigninComponent is not the bootstrap module
tried adding the sendEvent() in app.ts but no help
source code is provided below:

export class SigninComponent implements UIApplication {
  sendEvent(event: _UIEvent): void {
    console.log('in send Event');
    throw new Error("Method not implemented.");

Please suggest