serverless-env-yml.md

serverless.env.yml

The serverless.env.yml file includes environment specific configuration. This includes listing your stages and their regions. It also manages variables at 3 levels ordered by priority:

1. Region Variables: For a specific region in a specific stage.
2. Stage Variables: For a specific stage.
3. Common Variables: For all stages and regions.

vars:
  someVar: 1
stages:
  dev:
    vars:
      someVar: 2
    regions:
      us-east-1:
        vars:
          someVar: 3

Notice that you have the same variable defined in as common, stage and region variable. In that case the region variable will be used. If you removed the region variable, the stage variable will be used... and so on.