How to use the firebase-tools.deploy function in firebase-tools

task('deploy:devapp', ['stage-deploy:devapp'], () => {
  return firebaseTools.deploy({cwd: projectDir, only: 'hosting'})
    // Firebase tools opens a persistent websocket connection and the process will never exit.
    .then(() => {
      console.log('Successfully deployed the dev-app to firebase');
      process.exit(0);
    })
    .catch((err: any) => {
      console.log(err);
      process.exit(1);
    });
});

task('deploy:devapp', ['stage-deploy:devapp'], () => {
  return firebaseTools.deploy({cwd: projectDir, only: 'hosting'})
    // Firebase tools opens a persistent websocket connection and the process will never exit.
    .then(() => { console.log('Successfully deployed the demo-app to firebase'); process.exit(0); })
    .catch((err: any) => { console.log(err); process.exit(1); });
});

task('deploy:devapp', ['stage-deploy:devapp'], () => {
  return (
    firebaseTools
      .deploy({ cwd: projectDir, only: 'hosting' })
      // Firebase tools opens a persistent websocket connection and the process will never exit.
      .then(() => {
        console.log('Successfully deployed the demo-app to firebase');
        process.exit(0);
      })
      .catch((err: any) => {
        console.log(err);
        process.exit(1);
      })
  );
});

task('deploy:devapp', ['stage-deploy:devapp'], () => {
  return firebaseTools.deploy({cwd: projectDir, only: 'hosting'})
    // Firebase tools opens a persistent websocket connection and the process will never exit.
    .then(() => { console.log('Successfully deployed the demo-app to firebase'); process.exit(0); })
    .catch((err: any) => { console.log(err); process.exit(1); });
});

deploy(firebaseName, projectDirName) {
    console.log('Forging 🔨, please wait...');
    client.deploy({
      project: firebaseName,
      token: process.env.FIREBASE_TOKEN,
      cwd: process.cwd()
    }).then(() => {
      console.log(`${projectDirName} has been deployed at: https://${firebaseName}.firebaseapp.com 😊`);
      opn(`https://${firebaseName}.firebaseapp.com`);
      process.exit();
    }).catch((err) => {
      console.log(`Unable to deploy 😔. Please make sure that the firebase project name you entered (${firebaseName}) matches your firebase project name at https://console.firebase.google.com --- Error: ${err}`);
    });
  },
};

gulp.task(function deploy(done) {
	const TOKEN = process.env.FIREBASE_TOKEN || env.token;
	if (!TOKEN) {
		return done(new Error('No FIREBASE_TOKEN found in env or --token option passed.'));
	}

	log('Starting Firebase deployment ...');
	firebase.deploy({token: TOKEN}).then(
		() => {
			log(colors.green('Deployment successful'));
			done();
			process.exit();
		},
		(error) => {
			done(error);
			process.exit(1);
		});
});

export async function deploy(token: string) {
  try {
    return await client.deploy({
      project: 'hnpwa-coffee',
      only: 'hosting',
      token,
      cwd: process.cwd()
    });
  } catch (e) {
    throw e;
  }
}