ge-volume-extractor/index.js

const Xray = require('x-ray')

const x = Xray()

const RE_VOLUME_DATA_POINT = /\[new Date\('([^']+)'\), (\d+)\]/

function extractTrendScript(html) {
  return new Promise((resolve, reject) => {
    x(html, 'div.stats+script')((err, data) => {
      if (err) {
        return reject(err)
      }

      return resolve(data)
    })
  })
}

function extractTrendData(body) {
  return body
    .split('\r\n')
    .map(s => s.trimLeft())
    .filter(s => /^trade180/.test(s))
    .map(s => {
      const [, date, volume] = RE_VOLUME_DATA_POINT.exec(s)
      return { date, volume: +volume }
    })
}

function getItemHtml(itemId) {
  return axios.get(`http://services.runescape.com/m=itemdb_oldschool/Runescape/viewitem?obj=${itemId}`)
    .then(({ data }) => data)
}

module.exports = {
  // getItemHtml,
  extractTrendData
  // getItemVolume: itemId => {
  //   return getItemHtml(itemId)
  //     .then(extractTrendScript)
  //     .then(extractTrendData)
  // }
}