aws lambda batch item fails

aws_lambda_batch_item_fails.js

console.log('Loading function');

exports.handler = async (event) => {
    //console.log('Received event:', JSON.stringify(event, null, 2));
    
    const fails = [];
    for (const { messageId, body } of event.Records) {
        console.log('SQS message %s: %j', messageId, body);
        fails.push(messageId);
    }
    // throw new Error('intentional');
    
    return {
        batchItemFailures: fails.map(i => ({itemIdentifier: i}))
    };

    
};