Homarr/packages/api/src/server.ts

import { cache } from "react";
import { headers } from "next/headers";
import { createTRPCOptionsProxy } from "@trpc/tanstack-react-query";

import { appRouter, createCaller, createTRPCContext } from "@homarr/api";
import { auth } from "@homarr/auth/next";

import { makeQueryClient } from "./shared";

/**
 * This wraps the `createTRPCContext` helper and provides the required context for the tRPC API when
 * handling a tRPC call from a React Server Component.
 */
const createContext = cache(async () => {
  const heads = new Headers(await headers());
  heads.set("x-trpc-source", "rsc");

  return createTRPCContext({
    session: await auth(),
    headers: heads,
  });
});

export const api = createCaller(createContext);

// IMPORTANT: Create a stable getter for the query client that
//            will return the same client during the same request.
export const getQueryClient = cache(makeQueryClient);
export const trpc = createTRPCOptionsProxy({
  ctx: createContext,
  router: appRouter,
  queryClient: getQueryClient,
});