GraphCool TypeError:将循环结构转换为JSON

Question

我复制了官方文档中的示例，希望看到一些不同的错误(无效的URL或无效的auth键或类似的东西)，但是我得到了一些webpack/沙箱错误：

const fetch = require('isomorphic-fetch')
const Base64 = require('Base64')
const FormData =require('form-data')

const apiKey = '__MAILGUN_API_KEY__'
const url = '__MAILGUN_URL__'

export default event => {

  const form = new FormData()
  form.append('from', 'Nilan <nilan@graph.cool>')
  form.append('to', 'Nikolas <nikolas@graph.cool>')
  form.append('subject', 'Test')
  form.append('text', 'Hi')

  return fetch(url, {
    headers: {
      'Authorization': `Basic ${Base64.btoa(apiKey)}`
    },
    method: 'POST',
    body: form
  })
}

​

​

即使是简单的API请求也会失败：

require('isomorphic-fetch')

module.exports = function (event) {
  const url = 'https://jsonplaceholder.typicode.com/posts'
  return fetch(url)
}

上面的代码还返回：

TypeError: Converting circular structure to JSON

at Object.stringify (native)

at /data/sandbox/lib/sandbox.js:532:48

at /data/io/8e0059b3-daeb-4989-972f-e0d88e27d15e/webtask.js:46:33

at process._tickDomainCallback (node.js:481:9)

如何从自定义图形酷订阅/解析器成功地调用API？

Answer 1

这是最简单的工作示例：

require('isomorphic-fetch')

module.exports = function (event) {
  const url = 'https://jsonplaceholder.typicode.com/posts'
  return fetch(url)
    .then(res => res.json())
    .then(data => {
      console.log(data)
      return {
        data: {
          sum: 3  
        }
      }
    })
}