Aws lambda: don't make function within a loop

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AWS

Hi ,
i have created a aws lambda function to load all images in s3 bucket with below code:

var AWS = require('aws-sdk');
var s3 = new AWS.S3();

exports.handler = (event, context, callback) => {   
    
    var s3Bucket = 'mybucket';
    var imagesUrl = [];
    var params = {Bucket: s3Bucket,Delimiter: '/',Prefix:'subFolder/'};

    s3.listObjects(params, function(err, data){      
      var bucketContents = data.Contents;
        for (var i = 0; i < bucketContents.length; i++){
          var urlParams = {Bucket: s3Bucket, Key: bucketContents[i].Key};
            s3.getSignedUrl('getObject',urlParams, function(err, url){
              imagesUrl.push(url);
            });
        }
        context.succeed(imagesUrl);
    });
};

And i want to ask 2 things:
- With my code like that , does it have any problem ?
- It has warning "Don't make function within a loop" at s3.getSignedUrl. How can i resolve this code in aws lambda .

Thanks.

What I have tried:

I want to know about the best way to solve this problem