TS Definitions don't acknowledge other backends or their configuration possibilities

Describe the bug

For example using i18next-async-backend works fine, but it uses backend.resources instead of backend.loadPath and the backend type differs a little bit.

TS2322: Type '{ resources: { "en-US": { common: () => Promise<{ default: { hello: string; }; hello: string; }>; }; }; }' is not assignable to type 'BackendOptions'. Object literal may only specify known properties, and 'resources' does not exist in type 'BackendOptions'.

TS2322: Type 'typeof AsyncBackend' is not assignable to type 'NewableModule<BackendModule<unknown>>'. Types of property 'type' are incompatible. Type 'string' is not assignable to type '"backend"'. server.d.ts(53, 5): The expected type comes from property 'backend' which is declared here on type 'RemixI18NextOption'

Options for RemixI18Next:

import {RemixI18Next} from "remix-i18next";
import AsyncBackend from "i18next-async-backend";

export const i18n = new RemixI18Next({
    detection: {
        supportedLanguages: ["en-US"],
        fallbackLanguage: "en-US"
    },

    i18next: {
        backend: {
            resources: localeResources
        }
    },
    backend: AsyncBackend
});

Your Example Website or App

https://github.com/Widen/i18next-async-backend

Steps to Reproduce the Bug or Issue

Follow the remix-i18next guide on readme
Instead of FS backend use i18next-async-backend for server

Expected behavior

TypeScript sees the configuration options as valid.

Screenshots or Videos

No response

Platform

Windows 10
Node.js 18
React 18
TypeScript 4.6.4

Additional context

No response

The types of the i18next comes from the actual init options type exported by the library, it only omits the React (because on the server class it's not used) and detection (because it's configured in another option).

remix-i18next/src/server.ts

Line 62 in 58a842a

i18next?: Omit<InitOptions, "react" | "detection"> | null;

If the i18next.backend.resources key is type is not considered valid then it must be an error in the InitOptions or i18next-async-backend is using an invalid option.

And the type of the backend options also comes from i18next itself, so again the i18next-asnyc-backend is not conforming with the official type.

remix-i18next/src/server.ts

Line 67 in 58a842a

backend?: NewableModule<BackendModule<unknown>>;