I cannot figure out this typing error

export function CreateWorkflow<T>(options: DurableWorkflowOptions<T>): DurableObject {
  // options: DurableWorkflowOptions<T>

  return class DurableWorkflow<T> implements DurableObject {
    state: DurableObjectState
    alarmStack: AlarmStack

    constructor(state: DurableObjectState) {
      this.state = state
      this.alarmStack = new AlarmStack(this.state)
    }

    async fetch(request: Request) {
      return new Response("unknown path", {
        status: 404
      })
    }

    async alarm() {}
  }
}

export function CreateWorkflow<T>(options: DurableWorkflowOptions<T>): DurableObject {
  // options: DurableWorkflowOptions<T>

  return class DurableWorkflow<T> implements DurableObject {
    state: DurableObjectState
    alarmStack: AlarmStack

    constructor(state: DurableObjectState) {
      this.state = state
      this.alarmStack = new AlarmStack(this.state)
    }

    async fetch(request: Request) {
      return new Response("unknown path", {
        status: 404
      })
    }

    async alarm() {}
  }
}

fetch(request: Request<unknown, CfProperties<unknown>>): Response | Promise<Response> {
        
    }

fetch(request: Request<unknown, CfProperties<unknown>>): Response | Promise<Response> {
        
    }