dynamo.updateItem(...).promise is not a function

Question

I'm referring to the CDK tutorial here https://cdkworkshop.com/20-typescript/40-hit-counter/200-handler.html

but my code below

await dynamo.updateItem({
    TableName: process.env.HITS_TABLE_NAME,
    Key: { path: { S: event.path } },
    UpdateExpression: 'ADD hits :incr',
    ExpressionAttributeValues: { ':incr': { N: '1' } }
}).promise();

will return this error dynamo.updateItem(...).promise is not a function. It seems the tutorial is outdated.. what should I change to fix the code?

Answer 1

It's outdated yes, Lambdas runtime now includes JavaScript SDk V3 but your coding for V2.

If you're using the V3 JavaScript SDK then the updateItem returns a promise by dead.

Here's an example

const { DynamoDBClient } = require("@aws-sdk/client-dynamodb");
const { DynamoDBDocumentClient, UpdateCommand } = require("@aws-sdk/lib-dynamodb");

...
...


await ddbDocClient.send(
      new UpdateCommand({
        TableName: "RetailDatabase",
        Key: {
          pk: "jim.bob@somewhere.com",    // Partition key
          sk: "metadata",                 // Sort key
        },
        ExpressionAttributeNames: {
          "#n": "name",
        },
        UpdateExpression: "set #n = :nm",
        ExpressionAttributeValues: {
          ":nm": "Big Jim Bob",
        },
        ReturnValues: "ALL_NEW",
      })
  );