Internal transform failure for StageName defined by reference in a SAM template about serverless-application-model HOT 3 CLOSED

I am closing this issue in favor of tracking the problems thru #22 and #20

from serverless-application-model.

Update: I got a bit confused but now it seems clear that this issue is specific to how Transform processes referenced StageName for AWS::Serverless::Api rather than being a generic issue with processing referenced variables. For example, the following template was adopted from the HelloWorld example and appears to work correctly:

AWSTemplateFormatVersion : '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Parameters:
  APIStage:
    Default: dev
    Description: Name of the API stage to use for deployment
    Type: String
    AllowedPattern: '[A-Za-z0-9-]*'

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: index.handler
      Runtime: nodejs4.3
      Environment:
        Variables:
          APIStage: !Ref APIStage

from serverless-application-model.

See #22. We don't support !Ref on the StageName parameter yet.

from serverless-application-model.