ddb.ts

import { Handler, Context, APIGatewayEvent, APIGatewayProxyResult } from 'aws-lambda';
import DynamoDB = require('@aws-sdk/client-dynamodb');

const helloWorldTableName = process.env.DDB_TABLE_NAME as string;
const helloWorldTablePk = process.env.DDB_TABLE_PK as string;

const ddbClient = new DynamoDB.DynamoDBClient({});

const handler: Handler = async function(event: APIGatewayEvent, context: Context) {
  const getItemParams: DynamoDB.GetItemCommandInput = {
    TableName: helloWorldTableName,
    Key: {
      [helloWorldTablePk]: {
          'S': 'foo'
      }
    }
  };

  const getItem = new DynamoDB.GetItemCommand(getItemParams);
  const item = await ddbClient.send(getItem);

  const resp: APIGatewayProxyResult = {
    statusCode: 200,
    body: JSON.stringify({'message': 'hello world'})
  }

  return resp;
}

export { handler }