const region = 'us-east-1'
const { S3Client, waitUntilObjectExists } = require('@aws-sdk/client-s3');

async function sdkv3(params) {
    const { Bucket, Key } = params;
    const s3 = new S3Client({ region });
    try {
        await waitUntilObjectExists({
            client: s3,
            maxWaitTime: 200
        }, {Bucket, Key})
    } catch (error) {
        console.log("Done with V3")
    }
}


async function sdkv2(params) {
    const { Bucket, Key } = params;
    const AWS = require('aws-sdk');
    AWS.config.region = region;
    const s3 = new AWS.S3();
    try {
        await s3.waitFor('objectExists',{Bucket, Key}).promise()
    } catch (error) {
        console.log('Done with V2')
    }
}

const param = {
    Bucket: 'dev-exportbucket-1nvs7qmdel',
    Key: 'filedoesntexist.json'
  };

sdkv2(param)
// sdkv3(param)