Cannot use multiple $file variable in Resources section of serverless.yml

Serverless Framework
1

This feature request indicates that it should be possible to include multiple files in the Resources section. I want to do this to better manage a large file with hundreds of resources in it.

However, doing this

resources:
  Resources:
    - ${{file(1.yaml)}}
    - ${{file(2.yaml)}}

Results in a template with the Resources key set to a list, which looks like

"Resources": [
    {
      "Resource1": {
        "Type": "AWS::Logs::SubscriptionFilter",
         ...
          
      }
    },
    ...

Which fails when the template is uploaded to CloudFormation:

  Error --------------------------------------------------
 
  The CloudFormation template is invalid: Template format error: Any Resources member must be an object.

What is the proper way to use this feature? I’ve tried this dozens of different ways in multiple versions of serverless and using $file in the Resources section always results in the variable not being interpreted, interpreted wrongly as in this bug report, or producing invalid output in the CF template.

2

Looking at those bugs reports, I’m not sure this feature works…