server.js

const express = require("express");
const jsonServer = require("json-server");
const chokidar = require("chokidar");
const cors = require("cors");

const fs = require("fs");
const { buildSchema } = require("graphql");
const graphqlHTTP = require("express-graphql");
const queryResolvers = require("./graphQL/serverQueriesResolver");
const mutationResolvers = require("./graphQL/serverMutationsResolver");
const auth = require("./authMiddleware");

const fileName = process.argv[2] || "./data.js"
const port = process.argv[3] || 3500;

let router = undefined;
let graph = undefined;

const app = express();
const createServer = () => {
    delete require.cache[require.resolve(fileName)];
    setTimeout(() => {
        router = jsonServer.router(fileName.endsWith(".js")
            ? require(fileName)() : fileName);

        let schema = fs.readFileSync("./graphQL/serverQueriesSchema.graphql", "utf-8") + fs.readFileSync("./graphQL/serverMutationsSchema.graphql", "utf-8");
        let resolvers = { ...queryResolvers, ...mutationResolvers };
        graph = graphqlHTTP({
            schema: buildSchema(schema), rootValue: resolvers,
            graphiql: true, context: { db: router.db }
        })
    }, 100)
}
createServer();
app.use(cors());
app.use(jsonServer.bodyParser)
app.use(auth);
app.use("/api", (req, resp, next) => router(req, resp, next));
app.use("/graphql", (req, resp, next) => graph(req, resp, next));
chokidar.watch(fileName).on("change", () => {
    console.log("Reloading web service data...");
    createServer();
    console.log("Reloading web service data complete.");
});
app.listen(port, () => console.log(`Web service running on port ${port}`));