Testing promisse JS

promisse_javascript.js

import * as AWS from 'aws-sdk'

AWS.config.update({ region: 'us-east-1' });

var credentials = new AWS.SharedIniFileCredentials({ profile: 'default' });
AWS.config.credentials = credentials;

const ec2 = new AWS.EC2();

var params = {};

ec2.describeVpcs(params).promise()
  .then(
    (data) => {
      return data;
    })
    .then((data)=>{
      return callbackFirst(data);
    }).then((data)=>{
      callbackSecond(data);
    })
  .catch((error) => {
    console.log(error);
  }).finally(() => {
    console.log('finally')
  });

  function callbackFirst(data:any) {
    let vpcs = [];
    for (const key in data.Vpcs) {
      if (Object.prototype.hasOwnProperty.call(data.Vpcs, key)) {
        const element = data.Vpcs[key]['VpcId'];
        if(Object.prototype.hasOwnProperty.call(data.Vpcs[key], 'VpcId')){
          vpcs.push(element);
        }
        
      }
    }

    console.log(vpcs);

    var params = {

      Filters: [
        {
          Name: 'vpc-id',
          Values: vpcs
        },
        /* more items */
      ]
    };

    ec2.describeNetworkInterfaces(params).promise().then((data)=>{
       console.log(data);
    },
    (error)=>{
      return error;
    })
  }

  function callbackSecond(data:any) {
    console.log('callbackSecond')
    console.log(data)
  }