index.js

import dotenv from "dotenv";
import express from "express";
import { ApolloServer } from "apollo-server-express";
import mongoose from "mongoose";
import morgan from "morgan";
import schema from "./src/schema.js";
import logger from "./config/winston.js";

// if server is started using `npm start`, it will use .dev.env file to populate variables.
if (process.env.ENV === "dev") dotenv.config({ path: ".dev.env" });
else dotenv.config({ path: ".env" });

const app = express();

const options = {
    keepAlive: 1,
    useNewUrlParser: true,
    useUnifiedTopology: true,
};
mongoose
    .connect(process.env.DB_URI, options)
    .then(() => {
        console.log("Database connected");
    })
    .catch((err) => {
        console.log(err);
    });

// Mongoose models are provided in context.
const server = new ApolloServer({
    schema,
    tracing: true,
    logger,
    plugins: [
        {
            requestDidStart() {
                return {
                    didEncounterErrors(requestContext) {
                        requestContext.logger.error(requestContext.errors);
                    },
                };
            },
        },
    ],
});

// Applies cors, bodyparser middleware and stuff too.
server.applyMiddleware({ app, path: "/api" });

app.use(morgan("combined", { stream: logger.stream }));
app.listen(5000, () => {
    logger.info(
        `Apollo server listening at http://localhost:5000${server.graphqlPath}`
    );
    console.log(
        `Apollo server listening at http://localhost:5000${server.graphqlPath}`
    );
});