Nanoexpress server fails on Heroku & AWS - runs fine locally - cannot trace 'dest.on()' error - node.js

Question

Relevant stack-trace below - from Heroku:
2020-04-28T17:49:11.997756+00:00 app[web.1]: Your app is listening on port 14385
2020-04-28T17:49:12.491486+00:00 heroku[web.1]: State changed from starting to up
2020-04-28T17:49:41.748150+00:00 heroku[web.1]: State changed from up to crashed
2020-04-28T17:49:41.649885+00:00 app[web.1]: _stream_readable.js:660
2020-04-28T17:49:41.649896+00:00 app[web.1]: dest.on('unpipe', onunpipe);
2020-04-28T17:49:41.649897+00:00 app[web.1]: ^
2020-04-28T17:49:41.649897+00:00 app[web.1]:
2020-04-28T17:49:41.649898+00:00 app[web.1]: TypeError: dest.on is not a function
2020-04-28T17:49:41.649899+00:00 app[web.1]: at ReadStream.Readable.pipe (_stream_readable.js:660:8)
2020-04-28T17:49:41.649900+00:00 app[web.1]: at SendStream.stream (/app/node_modules/send/index.js:798:10)
2020-04-28T17:49:41.649900+00:00 app[web.1]: at SendStream.send (/app/node_modules/send/index.js:707:8)
2020-04-28T17:49:41.649900+00:00 app[web.1]: at /app/node_modules/send/index.js:774:12
2020-04-28T17:49:41.649901+00:00 app[web.1]: at FSReqCallback.oncomplete (fs.js:172:5)
From AWS (EC2 using a Bitnami instance for NodeJS apps):
Your app is listening on port 8080
_stream_readable.js:666
dest.on('unpipe', onunpipe);
^
TypeError: dest.on is not a function
at ReadStream.Readable.pipe (_stream_readable.js:666:8)
at SendStream.stream (/opt/bitnami/apps/demo/htdocs/node_modules/send/index.js:798:10)
at SendStream.send (/opt/bitnami/apps/demo/htdocs/node_modules/send/index.js:707:8)
at /opt/bitnami/apps/coronavirus-demo/htdocs/node_modules/send/index.js:774:12
at FSReqCallback.oncomplete (fs.js:167:5)
error: Forever detected script exited with code: 1
error: Script restart attempt #1
I see that we seem to be dying on _stream_readable.js:666 where 'dest.on' isn't defined - and I'm way into the weeds of Node at this point - so I'm not sure what I'm looking for, but I find that we're defining this method further down in the file:
https://github.com/nodejs/node/blob/master/lib/_stream_readable.js:852 -
Is this as simple as we're evaluating this _stream_readable file top-down and we haven't defined on() as of line 666 and that's why it's failing?
But why would it work locally? The app runs fine with Nanoexpress server on a Macbook Pro - same package.json and lock files - no devDependencies that make any difference (the only devDependencies are like Mocha and Sinon and Chai for tests)
I've run the app locally with NODE_ENV=production and NPM_CONFIG_PRODUCTION=true (it's a React & Express [Nanoexpress] app) and it boots and I can get what I need running just fine.
It's only when I push to Heroku / AWS that I'm getting this failure. Feels like we're trying to use a function before it's defined...

Answer 1

nanoexpress author here.
nanoexpress works fine on Heroku on my projects, but on AWS did not test, but nanoexpress does not support Lambda/Serverless.
Please check first your code or try PRO version as now it's Free