Populate variables before parsing serverless.yml

[lucas-rudd]

This is a Feature Proposal

Description

• What is the use case that should be solved.
  Currently this plugin is setting the step function, state machine, and activity keys before the serverless.yml file has populated the variables.

This allows you to organize serverless.yml like such:

stepFunctions:
  stateMachines:
    ${file(config/env/${opt:stage}.yml):stateMachines}

but not like this

stepFunctions:
  ${file(config/env/${opt:stage}.yml):stepFunctions}

I've got a PR out to fix this already #116

Additional Data

• Serverless Framework Core Version you're using: 1.24.1
• The Plugin Version you're using: 1.4.0

[horike37]

just released this fix with v1.4.1.
Thank @lucas-rudd 😄