@tremorvideo/blink-cli/src/prepare/get-scripts-and-title.js

const htmlparser = require('htmlparser2')
/**
 * I promise you.
 * @param  {[type]} html [description]
 * @return {[type]}      [description]
 */
module.exports = (html) => {
  return new Promise((resolve, reject) => {
    const scriptSrcs = []
    let width
    let height
    let title
    let hasParsedTitle = false
    var parser = new htmlparser.Parser({
      onopentag: (name, attribs) => {
        if (name === 'title') {
          hasParsedTitle = true
        } else if (name === 'script' && attribs.src) {
          if (attribs.src.includes('blink-')) {
            width = +attribs['data-width']
            height = +attribs['data-height']
          }
          scriptSrcs.push(attribs.src)
        }
      },
      ontext: (text) => {
        if (hasParsedTitle && !title) {
          title = text
        }
      },
      onerror: (err) => {
        reject(err)
      }
    }, { decodeEntities: true })
    parser.write(html)
    parser.end()
    resolve({ title, scriptSrcs, width, height })
  })
}