Wrapped the onbveforeload event is a static function to send a confirmation message when the user tries to close the window

window-close-notifier.ts

export class WindowCloseNotifierHelper {

    public static setMessage( message: any ) {
        if ( message && _.isFunction(message) ) {
            window.onbeforeunload = message;
        } else if ( message ) {
            window.onbeforeunload = ( e: any ) => {
                if ( e ) {
                    e.returnValue = message;
                }
                return message;
            };
        } else {
            window.onbeforeunload = null;
        }
    }
}