Rename funcitonname to match filename.

src/components/AuthUser/SignInForm/postCredentials.ts

 import axios from 'axios';
 import { CredentialsType } from './CredentialsType';
 
-export const fetchCookie = async (
+export const postCredentials = async (
   values: CredentialsType,
   cookie: React.Dispatch<React.SetStateAction<string>>,
 ): Promise<unknown> => {