function watch () {
  console.log(colors.magenta(`\nNow idle and waiting for file changes.`))
  chokidar.watch(watchLocations, {
    awaitWriteFinish: {
      stabilityThreshold: 50,
      pollInterval: 100
    }
  }).on('change', build)
}
Watch `watchLocations` paths for changes and continuously rebuild

@param {puppeteer.Page} page