Calling a sls webpack serve endpoint throws "TypeError: func is not a function"

[marcuswhybrow]

func represents the handler function defined in serverless.yml.

It seems this block initially sets handlerFunc (later referred to as func) to null. Setting it to funcConf.handler.split('.')[0] fixes the issue.

However, it looks like we have webpack setting the handlerFunc later on. I'm not sure what loadHandler does, or why it's important.

I searched the webpack docs and source but couldn't find reference to a loadHandler.

[smkamranqadri]

same issue with me!

[rivertam]

loadHandler is in lib/run. I haven't been able to figure out exactly why it's resulting in null only some times.

[perry-birch]

Try setting output definition in webpack.config.js:
libraryTarget: 'commonjs2',

[rivertam]

@PerryBirch changes nothing

[thenikso]

the loadHandler is used to reload the function from disk to address hot reloading. There might be a problem with how hot reloading is implemented that does not produce a "func" but I'm not quite sure why. Has anyone had more luck in debugging this issue?

[rvaidya]

I get this error only before the .webpack folder has been created - the console looks like it's ready and serving routes even though the webpack build is still happening in the background.

[briananderson1222]

Is there any more news on this or steps to get around it?

[fersman]

In my case the problem was that starting my function failed. And then I got this error. Try to add this to beggining of your handler (it will report errors):

process.on('uncaughtException', function (err) {
console.log(err);
});

[thenikso]

I was able to reproduce it last time but it seams fixed for me in the latest rc.3

Are you still expecting this issue?

[EQuimper]

I got this error in version rc.4

[rvaidya]

As of my PR (#58) using serverless-offline (https://github.com/dherault/serverless-offline) together with serverless-webpack should be the way to go for local testing

[HyperBrain]

serve will be removed in the next v3.0.0 release in favor of serverless-offline (see #152 ). No efforts will be spent on the function anymore. So I'll close this issue.