When I invoke

vapi.calls.create

it returns the following type:

export type CallsCreateResponse = Vapi.Call | Vapi.CallBatchResponse;

Since there are no shared props, Typescript can't narrow it automatically. So I have to do something like:

const isCall = (response: CallsCreateResponse): response is Vapi.Call => {
  return 'id' in response;
};

I’d rather avoid writing this manually. Am I missing a better way to handle this?

Use a type guard like

const isCall = (res: CallsCreateResponse): res is Vapi.Call => 'id' in res;

is concise and effective, especially given the lack of shared properties..

yea sure but i prefer to not even have to do this everytime I invoke this

Wrap calls.create in a helper function that handles type narrowing once, so your call sites stay clean and TypeScript infers types automatically. https://github.com/VapiAI/server-sdk-typescript