谷歌云平台节点。js库

我正在创建一个谷歌功能。然而,当我尝试部署到Google云平台时,我遇到了这个错误

错误:(gcloud.beta.functions.deploy)操作错误:代码=3,消息=函数加载错误:文件索引中的代码。无法加载js。 您是否在软件包中列出了所有必需的模块。json依赖关系? 详细堆栈跟踪:错误:找不到模块“request”

如何在谷歌云平台上传/安装“请求”库?

代码段

'use strict';
const https = require('https');
const host = 'https://www.example.com';
const clientId = 'qpopMIGtVdeIdVk3oEtr2LGbn8vTeTWz';
const clientSecret = 'eUnsWQ8y3AuiFHJu';
const grant_type = 'client_credentials';
const resource = 'b.microsoft.com/4fa4b4a7-d34f-49af-8781-c8b39f0cf770';
const request = require("request");


exports.oauthtoken = (req, res) => {

  // Call the Apigee API
  callGetOAuthToken().then((output) => {
    // Return the results from the APigee  to DialogFlow
    res.setHeader('Content-Type', 'application/json');
    res.send(JSON.stringify({ 'speech': output, 'displayText': output }));
  }).catch((error) => {     
        // If there is an error let the user know
    res.setHeader('Content-Type', 'application/json');
    res.send(JSON.stringify({ 'speech': error, 'displayText': error }));
  });
};
function callGetOAuthToken () {
  return new Promise((resolve, reject) => {

    let path = '/customers/v1/accesstoken';

    var authHeader =  Buffer.from(clientId + ':' + clientSecret).toString('base64');
    var post_options = {
                          url: host + path,
                          method: 'POST',
                          headers: 
                          {
                            'Content-Type': 'application/x-www-form-urlencoded',
                            'Authorization': 'Basic ' + authHeader,
                            'grant_type':grant_type
                          }
                        };

    // Make the HTTP request to get the weather
    request(post_options, function(err, res, body) {
        let output = JSON.parse(body);
        console.log(output);
        resolve(output);
      });   
  });
}

-艾伦-