Recursive JavaScript Lambda

main.js

const AWS = require('aws-sdk')
const lambda = new AWS.Lambda()
const sleep = (milliseconds) => {
    return new Promise(resolve => setTimeout(resolve, milliseconds))
}
const recursionLimit = 5

exports.handler = async(event) => {
    await sleep(2000)

    const iteration = event.iteration || 1
    console.log('Iteration: ' + iteration + '\n')

    if (iteration <= recursionLimit) {
        var params = {
            FunctionName: 'RecursiveLambda',
            InvocationType: 'Event',
            Payload: JSON.stringify({ "iteration": iteration + 1 })
        };
        return new Promise(function(resolve, reject) {
            lambda.invoke(params, function(err, data) {
                if (err) {
                    reject(err)    
                } else {
                    resolve(data)
                }
            })
        });
    }
   return 'Finished executing on iteration ' + iteration
};