(TypeScript) Recursively scan a DynamoDB table until all documents are returned

dynamodb-recursive-scan.ts

import {DynamoDB} from 'aws-sdk';
import {Key} from 'aws-sdk/clients/dynamodb';

async function dynamodbRecursiveScan(tableName: string, startFromKey?: Key) {
    const results: DynamoDB.ItemList = [];

    const dynamodb = new DynamoDB();
    const items = await dynamodb
        .scan({
            TableName: tableName,
            ExclusiveStartKey: startFromKey,
        })
        .promise();

    if (items.$response.error) {
        console.error(items.$response.error);
        throw new Error(items.$response.error.message);
    }

    results.push(...(items.Items?.length ? items.Items : []));

    // If there's another page, recursively fetch it, and keep fetching further pages till there are no more results
    if (items.LastEvaluatedKey) {
        results.push(...(await dynamodbRecursiveScan(tableName, items.LastEvaluatedKey)));
    }

    return results;
}