Can't separate appsync into different file

[willa75]

Hey there,

I started playing around with version 2.2.1 of this plugin, and I encountered an error with it being unable to pick up authorization (unsure about other fields) when I separate the appsync config into its own file like so:

appSync:
  - ${file(serverless.appsync-api.yml )}

I specifically get an error saying that Can't read 'type' of undefined where it references this line (99):

if (config.authentication.type === 'API_KEY' || 
    additionalAuthentications.some(function (auth) { return auth.type === 'API_KEY'; })) {

underneath the function/file getAppSyncConfig.

[bboure]

Hi @willa75

Right now, you can't do this

appSync:
  - ${file(serverless.appsync-api.yml )}

appSync must be an object. What you're doing is the equivalent of passing an array.
This explains why config.authentication is undefined (it would have to be be config[0].authentication.type)

I guess what you're trying to do might make sense and allowing it would help structure the different parts of the config.
i.e.: when appSync is an array, we could flatten/deep merge the passed objects.

I'd be happy to receive a PR if that's something you'd like to help with.

[willa75]

Hey @bboure

Thanks for getting back so quick, and that is understandable! I think I would like to take a shot at this change, though I will take me a bit to learn the basics of serverless framework plugin building. Will comment here when I have a working version of it