aws dynamodb DocumentClient is not supporting transactions ?

AWS dynamodb document client is not supporting transaction as of date DEC 1 2018 however DynamoDB supporting transactions

let aws=require("aws-sdk");
aws.config.update(
    {
        region:"us-east-1",
        endpoint: "dynamodb.us-east-1.amazonaws.com"	

    }
);
var dynamodb = new  aws.DynamoDB.DocumentClient();


dynamodb.transactWriteItems();

TypeError: dynamodb.transactWriteItems is not a function
    at Object.<anonymous> (/home/varnit/projects/aws_support/index.js:12:10)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:188:16)
    at bootstrap_node.js:609:3

however when i create an instance of only dynamodb it works var dynamodb = new aws.DynamoDB();

[imrajdas]

SOLUTION Update the aws-sdk package (>2.365) use- var dynamodb = new aws.DynamoDB(); instead of var dynamodb = new aws.DynamoDB.DocumentClient();

[evgenykireev]

As I temporary solution, I use some private methods of AWS.DynamoDB.DocumentClient. I know it’s a bad practice, but works fine for me.

1. I collect all transaction items in an array:

....
transactions.push({ Put: params });
....
transactions.push({ Delete: params })

where params are AWS.DynamoDB.DocumentClient params.

1. I map these transactions to AWS.DynamoDB array

const operationsMapping = {
  Put: 'putItem',
  Delete: 'deleteItem',
  Update: 'updateItem',
};

const dynamoClient = new Dynamo.DocumentClient({ service: dynamoInstance });

// Danger zone - using private methods!
const translator = dynamoClient.getTranslator();
const transactionItems = this.transaction.map((transaction) => {
  const operation = Object.keys(transaction)[0];
  const params = Object.values(transaction)[0];
  const operationType = operationsMapping[operation];

  const request = dynamoClient.service[operationType](params);
  const inputShape = request.service.api.operations[operationType].input;
  const translated = translator.translateInput(params, inputShape);

  return {
    [operation]: translated
  }
});

1. I execute all as a transaction:

const dynamo = new Dynamo();
const result = await dynamo.transactWriteItems({ TransactItems: transactionItems }).promise();