Normally bluebird should produce this warning when that happens: http://bluebirdjs.com/docs/warning-explanations.html#warning-a-promise-was-created-in-a-handle

Normally bluebird should produce this warning when that happens: http://bluebirdjs.com/docs/warning-explanations.html#warning-a-promise-was-created-in-a-handler-but-none-were-returned-from-it http://bluebirdjs.com/docs/warning-explanations.html#warning... If it doesn't do that for your case then its likely that it needs some fixing - you should probably open an issue and we'll try to reproduce it... Also, thenlint might work for you: https://www.npmjs.com/package/thenlint https://www.npmjs.com/package/thenlint