instrumentation.ts

import type { configureHttpDispatcher as ConfigureHttpDispatcher } from "@/lib/http-dispatcher";

type DispatcherModule = { configureHttpDispatcher: typeof ConfigureHttpDispatcher };

export async function register(): Promise<void> {
  if (process.env.NEXT_RUNTIME !== "nodejs" || typeof process.versions.bun === "string") return;

  // Keep the Node-only undici graph out of Next's browser/edge instrumentation
  // bundles. Node 22 can load this local TypeScript module directly.
  const importRuntimeModule = Function("specifier", "return import(specifier)") as (
    specifier: string,
  ) => Promise<DispatcherModule>;
  const moduleUrl = `file://${encodeURI(process.cwd())}/lib/http-dispatcher.ts`;
  const { configureHttpDispatcher } = await importRuntimeModule(moduleUrl);
  await configureHttpDispatcher();
}