What's causing the discrepancy in the parameters?

I have an issue with the following method:

import { getCookie } from 'cookies-next';

export const getAccessTokenFromCookies = (
  req?: NonNullable<Parameters<typeof getCookie>[1]>['req'],
  res?: NonNullable<Parameters<typeof getCookie>[1]>['res'],
): string | undefined => {
  const session = getCookie(sessionKey, { req, res }); // encountering type errors for req and res
  if (session) {
    const parsedSession = JSON.parse(session);
    return typeof parsedSession === 'object' && parsedSession != null ? parsedSession[accessTokenKey] : undefined;
  } else return undefined;
};

However, I am facing certain type errors as pointed out in the screenshot here: https://i.sstatic.net/bZyjpXmU.png

Upon inspecting the types of getCookie here, I found that

<Parameters<typeof getCookie>[1]>
has a type of `OptionsType | undefined`, where
OptionsType = DefaultOptions | AppRouterOptions
. The compiler error seems to indicate that DefaultOptions (which includes the property
req?: IncomingMessage & { cookies?: TmpCookiesObj }
) is not compatible with AppRouterOptions (which includes the property res?: Response | NextResponse).

Considering that I'm deriving the types directly from the expected parameters of getCookie, I'm puzzled about this discrepancy. What measures can be taken to address this issue?

Edit: I found that declaring

options?: NonNullable<Parameters<typeof getCookie>[1]>
and passing it to getCookies resolves the issue.

Answer №1

The property applied to the cookies key does not align with the Request or NextRequest property under that same key. To address this discrepancy, consider removing the object that declares cookie, expanding it to encompass NextResonse['cookies'] and Response['cookies'], or encapsulating Request and/or NextRequest with Omit

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