Typescript, Express, Mocha & Chai Error while testing

Question

I made my first server using express in typescript and it perfectly works

import app from './Server'

const server = app.listen(8080, '0.0.0.0', () => {
    console.log("Server is listening on standard port 80...");
});

export default server;

Now I try testing the routes stored in app:

import express from 'express';
import * as bodyParser from "body-parser";

const app = express();

app.use(bodyParser.json());

app.get("/", (req: express.Request, res: express.Response) => {
    res.status(200).send("SUCCESS");
});

export default app;

Using this test:

import * as chai from 'chai';
import chaiHttp = require('chai-http');

chai.use(chaiHttp);

import server from '../src';

describe("LogAPI", () => {

    describe('Base express tests', () => {
        it("Should return 'SUCCESS' if GET /", async () => {
            return chai.request(server).get("/").then(res => {
                chai.expect(res.body).to.equal("SUCCESS");
            })
        });

        it("Should return status-code 200 by calling GET /", async () => {
            return chai.request(server).get("/").then(res => {
                chai.expect(res.status).to.equal(200);
            })
        });

    });
});

But even while running the server itself works, staring the test with

mocha --require ts-node/register ./../test/**/*.ts

throws me this error:

/Users/.../NotificationService/src/Server/index.js:5 var app = express_1.default(); ^ TypeError: express_1.default is not a function at Object. (/Users/.../NotificationService/src/Server/inde> x.js:5:28)

I am using es6 target and commonjs module. How can I properly test my server?

Update 1 I now fiddled a bit and it turned out that deleting the default() method from the compiled code resolved something.

Now, I get

/Users/.../NotificationService/test/node_modules/@types/chai-http/index.d.ts:13 import * as request from 'superagent'; SyntaxError: Unexpected token import

Update 2 My ts-config.json:

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs", 
    "outDir": "./../out“,
    "strict": true,
    "esModuleInterop": true   
  }
}

Answer 1

The answer was to not use seperate package.json and tsconfig.json files. Thanks to deerawan, I now use

- tsconfig.json
- package.json
- src/
    - index.ts
- test/
    - test.ts

which resolves the issue!