GraphQL Subscriptions with ExpressWS

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1

Hello, I already have a express + express-ws server set up and I’d like to implement websockets for graphql subscriptions. The guide says that I need to create a websocket server using the ws package. Won’t that interfere with the express-ws server? This is my current main file:

/* --------------------------- External Libraries --------------------------- */
import express from "express";
import bodyParser, { json } from "body-parser";
import { ApolloServer } from "@apollo/server";
import { expressMiddleware } from "@apollo/server/express4";
import compression from "compression";
import cors from "cors";
import "reflect-metadata";
import expressWs from "express-ws";

/* ---------------------------- Internal Imports ---------------------------- */
import { DB } from "database/data-source";

/* ----------------------------- Setup Variables ---------------------------- */
const app = expressWs(express()).app;
app.use(
  cors({
    origin: "*",
  }),
  bodyParser.json(),
  compression()
);

const initiate = async () => {
  // TypeORM
  await DB.initialize();

  // GraphQL
  const gqlServer = new ApolloServer({
    typeDefs: require("./graphql/schema").default,
    resolvers: require("./graphql/resolvers").default,
  });
  await gqlServer.start();

  // Endpoints
  app.use("/v1/", require("./routes/v1/router").default);
  app.use("/graphql", expressMiddleware(gqlServer));

  // Server
  app.listen(3000, () => {
    console.log("\x1b[34mExpress \x1b[37m » API ready and listening on port 3000.");
  });
};

initiate();