main.js

const core = require('@actions/core');
const twilio = require('twilio');

async function run() {
  const fromPhoneNumber = core.getInput('fromPhoneNumber');
  const toPhoneNumber = core.getInput('toPhoneNumber');
  const message = core.getInput('message');

  const accountSid =
    core.getInput('TWILIO_ACCOUNT_SID') || process.env.TWILIO_ACCOUNT_SID;
  const apiKey = core.getInput('TWILIO_API_KEY') || process.env.TWILIO_API_KEY;
  const apiSecret =
    core.getInput('TWILIO_API_SECRET') || process.env.TWILIO_API_SECRET;

  core.debug('Sending SMS');
  const client = twilio(apiKey, apiSecret, { accountSid: accountSid });
  const { sid } = await client.messages.create({
    from: fromPhoneNumber,
    to: toPhoneNumber,
    body: message,
  });
  core.debug('SMS sent!');

  core.setOutput('messageSid', sid);
}

function execute() {
  run().catch(err => {
    core.error('Failed to send message', err.message)
    core.setFailed(err.message);
  });
}

module.exports = execute;

execute();