NativeScript/apps/ui-tests-app/app.ts

import application = require("application");
application.mainModule = "mainPage";

application.onUncaughtError = function (error: application.NativeScriptError) {
    console.warn(error.message);
    if (error.nativeError) {
        console.warn("native error: " + error.nativeError);
    }
}

application.on(application.launchEvent, function (args: application.ApplicationEventData) {
    if (args.android) {
        // For Android applications, args.android is an android.content.Intent class.
        console.log("Launched application with: " + args.android + ".");
    } else if (args.ios !== undefined) {
        // For iOS applications, args.ios is NSDictionary (launchOptions).
        console.log("Launched application with: " + args.ios);
    }
});

application.on(application.suspendEvent, function (args: application.ApplicationEventData) {
    if (args.android) {
        // For Android applications, args.android is an android activity class.
        console.log("SuspendEvent Activity: " + args.android);
    } else if (args.ios) {
        // For iOS applications, args.ios is UIApplication.
        console.log("SuspendEvent UIApplication: " + args.ios);
    }
});

application.on(application.resumeEvent, function (args: application.ApplicationEventData) {
    if (args.android) {
        // For Android applications, args.android is an android activity class.
        console.log("ResumeEvent Activity: " + args.android);
    } else if (args.ios) {
        // For iOS applications, args.ios is UIApplication.
        console.log("ResumeEvent UIApplication: " + args.ios);
    }
});

application.on(application.exitEvent, function (args: application.ApplicationEventData) {
    if (args.android) {
        // For Android applications, args.android is an android activity class.
        console.log("ExitEvent Activity: " + args.android);
    } else if (args.ios) {
        // For iOS applications, args.ios is UIApplication.
        console.log("ExitEvent UIApplication: " + args.ios);
    }
});

application.on(application.lowMemoryEvent, function (args: application.ApplicationEventData) {
    if (args.android) {
        // For Android applications, args.android is an android activity class.
        console.log("LowMemoryEvent Activity: " + args.android);
    } else if (args.ios) {
        // For iOS applications, args.ios is UIApplication.
        console.log("LowMemoryEvent UIApplication: " + args.ios);
    }
});

application.on(application.uncaughtErrorEvent, function (args: application.ApplicationEventData) {
    if (args.android) {
        // For Android applications, args.android is NativeScriptError.
        console.log("NativeScriptError: " + args.android);
    } else if (args.ios) {
        // For iOS applications, args.ios is NativeScriptError.
        console.log("NativeScriptError: " + args.ios);
    }
});

application.start();