get circular fonts

lineto-circular.js

const fs = require('fs')
const { queue } = require('async')
const request = require('superagent')

async function main() {
  const fonts = []
  const page = await request
    .get('https://lineto.com/typefaces/circular/')
    .set('user-agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36')
  fontCutsIndices = []
  let i = -1
  while((i = page.text.indexOf('fontCuts:[', i+1)) >= 0) fontCutsIndices.push(i)
  for (const fontCutsIndex of fontCutsIndices) {
    let dataString = ''
    let openBracket = 0
    i = fontCutsIndex + 9
    do {
      if (page.text[i] === '[') openBracket++
      if (page.text[i] === ']') openBracket--
      dataString += page.text[i++]
    } while (openBracket > 0)
    const vars = dataString
      .replace(/"([^"]|\\.)+"/g, '')
      .replace(/[\w\$]+:/g, ':')
      .match(/[a-z\$_][\w\$]*/gi)
      .filter((v, i, a) => a.indexOf(v) === i)
    const json = dataString
      .replace(/([\w\$]+):/g, '"$1":')
      .replace(/(?:[^\w\$][\w\$]+)+([^\w\$])/gi, (m, s) => {
        return m.replace(/[\w\$]+/g, v => {
          if (vars.includes(v) && s !== '"') return 'null'
          return v
        })
      })
    const data = JSON.parse(json)
    for (const fontData of data) {
      fonts.push({
        name: fontData.fullName,
        asset: 'https://lineto.com' + fontData.assets.woff
      })
    }
  }
  const circularFonts = fonts.filter(font => font.name && font.name.startsWith('Circular') && !font.name.startsWith('Circular Mono'))
  const cookies = page.header['set-cookie'].map(cookie => {
    cookie = cookie.split(';')[0]
    return [cookie.split('=')[0], cookie.split('=').slice(1).join('=')]
  })
  if (!fs.existsSync('fonts')) fs.mkdirSync('fonts')
  const q = queue((font, callback) => {
    const stream = fs.createWriteStream('fonts/' + font.name.split(' ').join('-').toLowerCase() + '.woff')
    request.get(font.asset)
    .set('cookie', cookies.map(kv => kv.join('=')).join(';'))
    .set('user-agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36')
    .set('origin', 'https://lineto.com')
    .set('referer', 'https://lineto.com/typefaces/circular/')
    .pipe(stream)
    stream.on('close', () => {
      callback()
    })
  }, 4)
  q.push(circularFonts)
}

main()

TypeError: Cannot read properties of undefined (reading 'woff')