Programmatically get the API URLs for the val that calls this val. For example:

// @wilt.myCoolVal:
const myCoolVal = @wilt.thisUrl("web");
}
// returns:
// https://wilt-myCoolVal.web.val.run

If targetVal is passed as entry, returns the URL of the very first val in the current call stack. For example:

// @wilt.myFirstCoolVal:
const myFirstCoolVal = @wilt.mySecondCoolVal());
}
// @wilt.mySecondCoolVal:
const mySecondCoolVal = () => {
  return @wilt.thisUrl("web", "entry");
}
// Running @wilt.myFirstCoolVal returns:
// https://wilt-myFirstCoolVal.web.val.run