Apollo-server: const app = new Hapi.server needs to be named necessarily "app", really?

[frederikhors]

I'm using Readms's instructions for hapi.js:

const { ApolloServer, gql } = require('apollo-server-hapi');
const Hapi = require('hapi');

const typeDefs = gql`
    type Query {
        "A simple type for getting started!"
        hello: String
    }
`;

const resolvers = {
    Query: {
        hello: () => 'world'
    }
};

async function StartServer() {
    const server = new ApolloServer({ typeDefs, resolvers });

    const app = new Hapi.server({
        port: 3000
    });

    await server.applyMiddleware({
        app
    });

    await server.installSubscriptionHandlers(app.listener);

    await app.start();
}

StartServer().catch((error) => console.log(error));

it works like this, but if I change the name of app (for example app becomes testApp like this: const testApp = new Hapi.server({...) object it stop working and gives this error:

$ node server
TypeError: Cannot read property 'ext' of undefined
    at ApolloServer.<anonymous> (node_modules\apollo-server-hapi\dist\ApolloServer.js:45:23)
    at Generator.next (<anonymous>)
    at node_modules\apollo-server-hapi\dist\ApolloServer.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (node_modules\apollo-server-hapi\dist\ApolloServer.js:3:12)
    at ApolloServer.applyMiddleware (node_modules\apollo-server-hapi\dist\ApolloServer.js:42:16)
    at StartServer (server.js:73:18)
    at Object.<anonymous> (server.js:82:1)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)

I think this is strange, isn't it?

[tux-tn]

Hello @frederikhors , your issue is not strange at all but not related to apollo-server
The applyMiddleware method is using an options object instead of multiple parameters , you can do something like the snippet below to fix your problem:

async function StartServer() {
    const server = new ApolloServer({ typeDefs, resolvers });

    const testApp = new Hapi.server({
        port: 3000
    });

    await server.applyMiddleware({
        app: testApp
    });

    await server.installSubscriptionHandlers(app.listener);

    await app.start();
}