Node.js 如何为nodejs aws sdk配置caCert和代理；错误：无法获取本地颁发者证书；

我已经成功地用底部代码块配置了代理和证书文件，但仍然低于证书错误。我被这个问题困扰了很长一段时间，你们能帮我解决这个问题吗

{ Error: unable to get local issuer certificate
    at TLSSocket.<anonymous> (_tls_wrap.js:1105:38)
    at emitNone (events.js:106:13)
    at TLSSocket.emit (events.js:208:7)
    at TLSSocket._finishInit (_tls_wrap.js:639:8)
    at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:469:38)
  message: 'unable to get local issuer certificate',
  code: 'NetworkingError',
  region: 'eu-west-1',
  hostname: 's3.eu-west-1.amazonaws.com',
  retryable: true,
  time: 2020-09-08T14:51:27.596Z } 'Error: unable to get local issuer certificate\n    at TLSSocket.<anonymous> (_tls_wrap.js:1105:38)\n    at emitNone (events.js:106:13)\n    at TLSSocket.emit (events.js:208:7)\n    at TLSSocket._finishInit (_tls_wrap.js:639:8)\n    at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:469:38)'

const AWS = require("aws-sdk");
const fs = require("fs");
const path = require("path");
const url = require("url");
const HttpsProxyAgent = require("https-proxy-agent");

const certs = [fs.readFileSync(path.join(__dirname, "tls-cabundle.pem"))];

const proxyOptions = {};
Object.assign(proxyOptions, url.parse("http://USERNAME:PASSWORD@primary-proxy.PROXYURL:8080"));
Object.assign(proxyOptions, {
  rejectUnauthorized: true,
  ca: certs,
});

const creds = new AWS.Credentials({
  accessKeyId: "****************",
  secretAccessKey: "***********************",
  sessionToken: "**************************************************************",
});
AWS.config.credentials = creds;

AWS.config.update({
  region: "eu-west-1",
  httpOptions: {
    agent: new HttpsProxyAgent(proxyOptions),
  },
});

// Create S3 service object
const s3 = new AWS.S3({ apiVersion: "2006-03-01" });

// use aws-sdk S3 service object to list S3 Buckets as per https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#listBuckets-property
s3.listBuckets(function (err, data) {
  if (err) console.log(err, err.stack);
  else console.log(data);
});