How to create AWS StateMachine Activity via serverless - amazon-web-services

Question

I'm trying to deploy Step Function, but I see no ways to define activity in serverless config.
AWS docs https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-stepfunctions-activity.html saying that activity should be defined that way, but every time I do sls deploy I can't see new activity in step function console. Is it possible at all to create activity via serverless or I have to run script/create it manually?
Resources:
MyActivity:
Type: "AWS::StepFunctions::Activity"
Properties:
Name: myActivity
stepFunctions:
stateMachines:
stepfunctest:
events:
- http:
path: step
method: get
definition:
Comment: "A sample application"
StartAt: extract
States:
extract:
Type: Task
Resource: "arn:aws:state:#{AWS::Region}:#{AWS::AccountId}:activity:MyActivity"
End: true

Answer 1

assuming you're uing the serverless plugin https://github.com/serverless-operations/serverless-step-functions. You can create the activity by adding the activity into the stepFunction
stepFuntions:
activities:
- myActivity
stateMachines:
stepfunctest:
events:
- http:
path: step
method: get
definition:
Comment: "A sample application"
StartAt: extract
States:
extract:
Type: Task
Resource: "arn:aws:state:#{AWS::Region}:#{AWS::AccountId}:activity:MyActivity"
End: true