Unable to import typescript models, Property does not exit on type typeof and reference errors

Question

I'm trying to create a microservice using NodeJS, Hapi, and typescript. I have a basic route set up that was working, but I can't get my service created and imported using the directory structure that I want. That structure is basically:

/server.ts
/tsconfig.json
/packages.json
/Services/
         /CarService.ts
         /BoatService.ts
/Models
         /Car.ts
         /Boat.ts
/Tests
/Bundle

I'm trying to separate my models from my business logic. One of my services looks like:

module Services {
    export class CarService {
        saveCar(data: any): boolean {
            return false;
        }
    }
}

but also looked like this:

class CarService {
    saveCar(data: any): boolean {
        return false;
    }
}
export {CarService}

I've been trying to import this service into my server.ts

import CarService = Services.CarService;
let _carService = new CarService();

but it looked like this when I for the second version of carService

import * as _carService from './Services/CarService';

and I was trying to use the servcie like this:

server.route({
    method: 'POST',
    path: '/Cars/',
    handler: function (request:any, reply) {
        _carService.saveCar(request.payload);   // the error is here
        //_carService["saveCar"](request);
        reply("we did it!");
    }
});

The first method was giving me this error:

Property 'saveCar' does not exist on type 'typeof CarService'.

The second method compiles in visual code but is giving me this error:

ReferenceError: CarService is not defined

My tsconfig:

{
    "compilerOptions": {
        "module": "commonjs",
        "moduleResolution": "node",
        "outDir": "bundle",
        "target": "es5",
        "noImplicitAny": false,
        "sourceMap": true,
        "declaration": true
    },
    "filesGlob": [
        "./**/*/.ts"
    ]
}

So obviously my modules aren't compiling right. I don't know if the error is related to the tsconfig module resolution strategy or the output directory. I've fiddled with those settings too. I know from reading the documentation that the module resolution strategies look in a /src/ folder first, but at one point I had a rootDirs' array in my tsconfig.json that pointed to my/Models/and/Services/` directories that I thought would solve that issue.

Answer 1

You can use export default in CarService.ts, then import the class in server.ts:

// Services/CarService.ts
export default class CarService {
    saveCar(data: any): boolean {
        return false;
    }
}

// server.ts
import CarService from './Services/CarService';
let _carService = new CarService();

See also:

• The article ES6 In Depth: Modules from Mozilla;
• Modules vs. Namespaces: What is the correct way to organize a large typescript project?