Recommended Approach for Service Initialization in Effect with Next.js API Routes

const makeServiceA = Effect.gen(function* () {
  // executed once
  yield* Console.log("Init makeServiceA");

  return {
    doSomething: (_: Request) =>
      Effect.gen(function* () {
        // executed on every request
        yield* Console.log("Do something with request");
        return "ciao";
      }),
  };
});

class ServiceA extends Context.Tag("ServiceA")<
  ServiceA,
  Effect.Effect.Success<typeof makeServiceA>
>() {
  static Live = Layer.effect(this, makeServiceA);
}

const program = Effect.gen(function* () {
  const serviceA = yield* ServiceA;
  return (request: Request) => serviceA.doSomething(request);
}).pipe(Effect.provide(ServiceA.Live));

// init services
const handler = await Effect.runPromise(program);

export async function POST(request: NextRequest) {
  const response = await pipe(handler(request), Effect.runPromise);

  return new NextResponse(response);
}