aa.ts

== arquivo 1 ==
export namespace CreateRecipientGateway {
 export type Input = {
   firstName: string
 }
 
 export type Output = { id: string }
 
 export interface Contract {
 handle(i: Input): Promise<Output>
 }
}

== arquivo q impleementa =

export class CreateWiseRecipient extends BaseAPI implements CreateRecipientGateway.Contract {
  async handle(input: CreateRecipientGateway.Input): CreateRecipientGateway.Outupt {
       ....
  }
}