authContextValue.js

const authContextValue = useMemo(
    () => ({
        signIn: async data => {
            if (
                data &&
                data.emailAddress !== undefined &&
                data.password !== undefined
            ) {
                dispatch({ type: 'SIGN_IN', token: 'Token-For-Now' });
            } else {
                dispatch({ type: 'TO_SIGNIN_PAGE' });
            }
        },
        signOut: async data => {
            dispatch({ type: 'SIGN_OUT' });
        },

        signUp: async data => {
            if (
                data &&
                data.emailAddress !== undefined &&
                data.password !== undefined
            ) {
                dispatch({ type: 'SIGNED_UP', token: 'dummy-auth-token' });
            } else {
                dispatch({ type: 'TO_SIGNUP_PAGE' });
            }
        }
    }),
    []
);