Trying to close protractor browser on process exit

process_end_listener.ts

import { browser } from 'protractor';

/**
 * @experimental
 */
export function registerCloseBrowserOnProcessEndListener() {
    async function exitHandler(options, exitCode) {
        console.log('[registerCloseBrowserOnProcessEndListener] called!');
        try {
            await browser.close();
        } catch (err) {
            console.warn(`[registerCloseBrowserOnProcessEndListener] Cannot close browser for ${process.pid}`);
        } finally {
            process.exit(exitCode);
        }
    }
    // do something when app is closing
    process.on('exit', exitHandler.bind(null, { cleanup: true }));
    // catches ctrl+c event
    process.on('SIGINT', exitHandler.bind(null, { exit: true }));
    // catches "kill pid" (for example: nodemon restart)
    process.on('SIGUSR1', exitHandler.bind(null, { exit: true }));
    process.on('SIGUSR2', exitHandler.bind(null, { exit: true }));
    // catches uncaught exceptions
    process.on('uncaughtException', exitHandler.bind(null, { exit: true }));
}