Correct fix to get a working demo setup

[ringods]

Correct fix to get a working demo setup with latest dependency versions. The correct fix, as suggested by @HyperBrain was to remove the location setting from the serverless-offline plugin.

Also updated the dependencies to the latest versions. Verified correct functioning after bumping each of the dependencies.

[HyperBrain]

It seems that I should add the --location removal/usage instructions to the serverless-webpack V3 README 😄 .

[ktonon]

I removed node_modules, .webpack, and elm-stuff, then ran npm install and npm start. From the command line it all looks ok, but when I try to visit http://localhost:3000, I get the following error:

{
"errorMessage": "Error while loading hello",
"errorType": "SyntaxError",
"stackTrace": [
"/Users/ktonon/repos/elm-serverless-demo/src/Hello/API.elm:1",
"(function (exports, require, module, __filename, __dirname) { port module Hello.API exposing (main)",
"^^^^^^",
"SyntaxError: Unexpected identifier",
"at Object.exports.runInThisContext (vm.js:76:16)",
"at Module._compile (module.js:542:28)",

This is what I have

> $ npm ls --depth 0
elm-serverless-demo@1.0.0
├── cross-env@3.2.4
├── elm@0.18.0
├── elm-serverless@4.0.0
├── elm-webpack-loader@4.3.1
├── eslint@3.19.0
├── eslint-config-es2015@1.1.0
├── rc@1.2.1
├── serverless@1.19.0
├── serverless-offline@3.15.3
├── serverless-webpack@3.0.0-rc.1
├── shebang-loader@0.0.1
├── strip-debug-loader@1.0.0
└── webpack@3.5.4

[ringods]

@ktonon you are right. I still had a wrong serverless-webpack 2.2.0. With 3.0.0-rc1, I have the same error.

[HyperBrain]

If it works stable with 2.2.0 with these settings, I'd propose that you use the official 2.2.0 for now. I'll check V3 to see why it breaks there. Eventually we should create a bug for that in serverless-webpack.
A possible fix would be integrated in rc.2 then.

[HyperBrain]

@ktonon @ringods I think I already know the reason of the issue. It's the file glob lookup of the handlers on execution. It mistakenly choses api.elm instead of api.js. This issue is definitely a serverless-webpack V3 issue where the lookup algorithm changed. I will schedule a fix for rc.2.
Please use 2.2.0 for now. I'll let you know when a fixed version is available.

[ringods]

@ktonon I reverted serverless-webpack to 2.2.0 for the time being. This setup works AFAICS, so can you merge this?

[ktonon]

Thanks