Twilo Flex Function for use with a Studio Run Function Widget to determine if workers are available or it's within opening hours

workers-available.js

const moment = require('moment-timezone');
const TIMEZONE = 'Europe/London'; // timezone needed for Daylight Saving Time adjustment
const OPEN_TIME = 9; // 9AM
const CLOSE_TIME = 18; // 8PM
const FRIDAY = 5;
const SATURDAY = 6;
const SAT_OPEN_TIME = 10; // 10AM
const SAT_CLOSE_TIME = 15; // 3PM

process.on('unhandledRejection', error => {
    console.log('unhandledRejection', error.message);
});

exports.handler = function (context, event, callback) {
    const client = context.getTwilioClient();
    doWork(client, callback);
};

async function doWork(client, callback) {

    const hour = moment().tz(TIMEZONE).format('H');
    const dayOfWeek = moment().tz(TIMEZONE).format('d');
    const workers = await getAvailableWorkerSize(client);

    if (workers === 0) {
        console.log('closed - no workers');
        response = false;
        callback(null, 'false');
        return;
    }

    if ((hour >= OPEN_TIME && hour < CLOSE_TIME) && dayOfWeek <= FRIDAY) {
        console.log('open - during the week');
        callback(null, true);
        return;
    } else if (dayOfWeek === SATURDAY && (hour >= SAT_OPEN_TIME && hour < SAT_CLOSE_TIME)) {
        console.log('open - saturday');
        callback(null, 'true');
        return;
    }

    console.log('closed - out of hours');
    callback(null, 'false');
}

async function getAvailableWorkerSize(client) {
    const taskrouter = client.taskrouter.workspaces('WSXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
    const workers = await taskrouter.workers.list({ available: true });
    return workers.length;
}