say.js/examples/all-demo.js

#!/usr/bin/env node

const say = require('../')

let text = 'This is Ground Control to Major Tom This is Ground Control to Major Tom This is Ground Control to Major Tom'
let voice
let speed = 2.0

// output some text to the console as the callback
say.speak(text, voice, speed, (error) => {
  if (error) {
    // This fires when say.stop fires. Not sure if that's a good or bad thing...
    return console.error('Error speaking!', error)
  }

  console.log('text to speech complete')
})

setTimeout(() => {
  console.log('prematurely killing speech')

  say.stop((err) => {
    if (err) {
      return console.error('unable to stop speech', err)
    }

    console.log('stopped')
  })
}, 2000)