require exported typescript class in javascript

Question

I'm moving my nodejs project from Javascript to Typescript. It's going to be a slow process, slowly changing things over a few months as i need to tweak stuff.

I've created a typescript class that looks something like this:

// RedisRepository.ts

export class RedisRepository {
  public async getDevice(serial: string) : Promise<Device> {
    // blah
    return device;
  }
}

Then in another Javascript file where i need to reference and then call the functions on the above class.

// ExpressApi.js

const repository = require('../Redis/RedisRepository');

async function getRedis(req, res) {
  try {
    const device = await repository.getDevice('serialnumberxxx');
    res.status(200).end(JSON.stringify(device ));
  } catch (e) {
    logger.error(e);
    res.status(500).end();
  }
}

however, when it tried to call the function on the repository it says it doesn't exist. Using chrome debugger, i can see that it exists at: repository.RedisRepository.prototype.getDevice. This doesn't seem the correct way to use the function though.

While I appreciate I could just convert ExpressApi.js to Typescript. I'm going to have this problem with many different files. So i need to use it as JavaScript for now. I'll slowly continue to go round the project and change things to Typescript.

Since getDevice is not static, you would need to new RedisRepository and then call getDevice on the instance. — crashmstr
– crashmstr, Commented Dec 13, 2019 at 12:50
You have export class so how about calling with import import { RedisRepository } from '../Redis/RedisRepository' — Jack jdeoel
– Jack jdeoel, Commented Dec 13, 2019 at 14:16

pavle · Accepted Answer · 2019-12-13 13:47:32Z

1

As @crashmstr mentioned, you should create a new instance of RedisRepository, then call getDevice method. If you still want to use

const repository = require('../Redis/RedisRepository');

syntax, you could export default new RedisRepository() from your RedisRepository.ts file.

answered Dec 13, 2019 at 13:47

pavle

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