lambda self-updating function

index.js

var AWS = require("aws-sdk");
var accessKeyId = process.env.accessKeyId;
var secretAccessKey = process.env.secretAccessKey;
var currentTS = Number(process.env.currentTS);
var lambda = new AWS.Lambda({
  accessKeyId,
  secretAccessKey,
  region: "us-east-1"
});

const start = function(event, context, callback) {
  if (Date.now() < 10 * 1000 * 60) {
    // do something only if 10 mins passed since last update
    lambda.updateFunctionConfiguration(
      {
        FunctionName: "EnvironmentTestLambda",
        Environment: {
          Variables: {
            ENV_VARIABLE_NAME: "STRING_VALUE",
            accessKeyId,
            secretAccessKey,
            currentTS: Date.now().toString()
          }
        }
      },
      function(err, data) {
        if (err) {
          console.log(err, err.stack); // an error occurred
          callback(err);
        } else {
          console.log(data); // successful response
          callback(null, data);
        }
      }
    );
  } 
};

// Uncomment this to test locally
// start(null, null, console.log);

exports.handler = start;