TypeError: Cannot read property 'finish' of undefined

var app = require('application');
app.android.foregroundActivity.finish();

import { android } from 'tns-core-modules/application';
android.foregroundActivity.finish();

import { hasKey, setBoolean } from 'tns-core-modules/application-settings';
 import { platformNativeScriptDynamic } from 'nativescript-angular/platform';
 import { AppOptions } from 'nativescript-angular/platform-common';
 import {
   on as applicationOn,
   off as applicationOff,
   exitEvent,
   launchEvent,
   ApplicationEventData,
   android,
 } from 'tns-core-modules/application';
 import { enableProdMode } from '@angular/core';
 import { AppModule } from '~/app/app.module';
 
 const firebase = require('nativescript-plugin-firebase');
 
 let isAppInitialized = false;
 let options: AppOptions = {};
 
 function launchListener(args: ApplicationEventData) {
   if (args.android) {
     handleColdStart(args.android);
     tryToInitializeFirebase();
   }
 }
 
 function handleColdStart(context) {
   if (!hasKey('isFirstStart')) {
     setBoolean('isFirstStart', true);
     android.foregroundActivity.finish();
   }
 }
 
 function tryToInitializeFirebase() {
   if (!isAppInitialized) {
     setTimeout(() => {
       firebase
         .init({})
         .then((instance) => {
           console.log('firebase.init donessse');
         })
         .catch((err) => {
           console.log('Firebase init error: ' + err);
         });
     }, 1000);
     isAppInitialized = true;
   }
 }
 
 function exitListener(args: ApplicationEventData) {
   if (args.android) {
     applicationOff(launchEvent, launchListener);
   }
 }
 
 applicationOn(launchEvent, launchListener);
 applicationOn(exitEvent, exitListener);
 
 if (module['hot']) {
   options.hmrOptions = {
     moduleTypeFactory: () => AppModule,
     livesyncCallback: (platformReboot) => {
       setTimeout(platformReboot, 0);
     },
   };
 
   module['hot'].accept(['./app/app.module'], () => {
     global['hmrRefresh']();
   });
 }
 
 enableProdMode();
 platformNativeScriptDynamic().bootstrapModule(AppModule);