function-cloudformation-template.json

"Resources": {
  "LambdaFunction": {
    "Type": "AWS::Lambda::Function",
    "Metadata": {
      "aws:asset:path": "./src",
      "aws:asset:property": "Code"
    },
    "Properties": {
      "Handler": "index.handler",
      "FunctionName": {
        "Fn::If": [
          "ShouldNotCreateEnvResources",
          "sendEmailToNewUser",
          {
            "Fn::Join": [
              "",
              [
                "sendEmailToNewUser",
                "-",
                {
                  "Ref": "env"
                }
              ]
            ]
          }
        ]
      },
      "Environment": {
        "Variables": {
          "ENV": {
            "Ref": "env"
          },
          "REGION": {
            "Ref": "AWS::Region"
          },
          "EMAIL_SERVER": "server",
          "EMAIL_USER": "user",
          "EMAIL_PASSWORD": "email",
          "EMAIL_PORT": "port"
        }
      }
    }
  }
}