AWS Lambda module caching anti-pattern

b.js

var first = true;

module.exports = function () {
  console.log(`first: ${first}`);
  if (first) {
    first = false;
  }
};

index.js

const b = require('./b');

exports.handle = function handle(event, context, callback) {
  var i = 0;

  while (i++ < 4) {
    b();
  }

  callback();
};

logs-simplified.log

/aws/lambda/module-cache-test START RUN 1
/aws/lambda/module-cache-test 2017-03-05T18:36:51.853Z	first: true
/aws/lambda/module-cache-test 2017-03-05T18:36:51.854Z	first: false
/aws/lambda/module-cache-test 2017-03-05T18:36:51.854Z	first: false
/aws/lambda/module-cache-test 2017-03-05T18:36:51.854Z	first: false
/aws/lambda/module-cache-test END

/aws/lambda/module-cache-test START RUN 2
/aws/lambda/module-cache-test 2017-03-05T18:37:39.899Z	first: false
/aws/lambda/module-cache-test 2017-03-05T18:37:39.899Z	first: false
/aws/lambda/module-cache-test 2017-03-05T18:37:39.899Z	first: false
/aws/lambda/module-cache-test 2017-03-05T18:37:39.899Z	first: false
/aws/lambda/module-cache-test END