Dynamic list of imported resources

[ignacioalles]

Is there a way to dinamically provide the list of resources to include depending on some other value (eg: provider.region) ?

I've tried several approaches but none of them worked.

1. Use a variable in path

custom:
  import:
    - resources/resource.${self:provider.region}.yml

cannot find the file. I think is trying to import it before variable value expansion.

Cannot import resources/resource.${self:provider.region}.yml: the given file doesn't exist

2. Relying on serverless variable expansion (it works well with other config elements)

custom:
  import: ${file(resources/resource.${self:provider.region}.yml):import}

cannot find the file either. I think it is the same reason.

Cannot import ${file(resources/resource.${self:provider.region}.yml):import}: the given module cannot be resolved
  Tried: 
   - ${file(resources/resource.${self:provider.region}.yml):import}/serverless.yml
   - ${file(resources/resource.${self:provider.region}.yml):import}/serverless.yaml
   - ${file(resources/resource.${self:provider.region}.yml):import}/serverless.js

3. Finally I've tried using .js import (despite having to workaround .js modules not found #10)

custom:
  import: 
    - module: resources.js
      inputs:
        region: ${self:provider.region}

and resources.js being:

module.exports = ({region}) => {
    return {
        custom: {
            import: [
                `resources/resource.${region}.yml`
            ]
        }
    }
}

with the same result:

 Cause: Cannot import resources/resource.${self:provider.region}.yml: the given file doesn't exist

Does anyone know how to workaround this issue?