capture-opt-out.ts

// Imports global types
import '@twilio-labs/serverless-runtime-types'
// Fetches specific types
import {
  Context,
  ServerlessCallback,
  ServerlessFunctionSignature,
} from '@twilio-labs/serverless-runtime-types/types'

type OptOut = {
  Body: string,
  From: string
}


export const handler: ServerlessFunctionSignature<{}, OptOut> = function (
  context: Context,
  event: OptOut,
  callback: ServerlessCallback,
) {

  const response = new Twilio.Response()
  response.setStatusCode(200)

  if (event.Body === 'STOP') {
    console.log('We\'ve got opt-out', event)

    context.getTwilioClient()
      .sync
      .services('ISf4a436efb334298119ada8ecd755902a')
      .syncLists('ES5972b0b60648407fb073084b6c37e658')
      .syncListItems
      .create({
        data: {
          phoneNumber: event.From,
        },
      })
      .then(listItem => {
        console.log('Successfully stored list item')
        callback(null, response)
      })
      .catch(err => {
          console.log(err)
          callback(null, response)
        },
      )
  } else {
    callback(null, response)
  }
}