implement-if-then-logic-in-your-serverless.yml-file.ex-3-a.yml

service: my-service

plugins:
  - serverless-plugin-ifelse

provider:
  name: aws
  runtime: nodejs12.x
  stage: ${opt:stage, "dev"}
  environment:
    staticMessage: "this is a static message"

custom:
  serverlessIfElse:
        - If: '"${self:provider.stage}" === "prod"'
          Set:
            provider.environment.dynamicMessage: "this is a dynamic PROD message"
          ElseSet:
            provider.environment.dynamicMessage: "this is a dynamic DEV/TEST message"

functions:
  fooFunction:
    handler: foo-function.handler
    events:
      - http:
          path: foo
          method: get