Response

example.ts

type ValidResponse<T> = {
  val: T
  err: false
}

type InvalidResponse = {
  val: unknown
  err: true
}

type Response<T> = ValidResponse<T> | InvalidResponse


const getTheThing = async (): Response<AlchemyApiResponse> => {
 try { 
  const res = await getResponseFromAlchemy() 
  return {
    val: res,
    err: false
  }
 } catch(e) {
  return {
    val: e,
    err: true
  }
 }
}
  
const getTheThingAndDoAThing = async () => {
  const { err, val: alchemyResponse } = await getTheThing()
  if (err) {
    // handle the error
  } else {
    doAThing(alchemyResponse)
  }
}