code: function _buildS3Client(s3ClientOpts) {
    var s3ConstructorArgins = _stripKeysWithUndefinedValues({
      apiVersion: '2006-03-01',
      region: s3ClientOpts.region,
      accessKeyId: s3ClientOpts.key,
      secretAccessKey: s3ClientOpts.secret,
      endpoint: s3ClientOpts.endpoint
    });
    return new AWS.S3(s3ConstructorArgins);
  }
docs: ƒ