Expose multiple objects through module with constructor in nodejs

Question

I created a module in nodejs where I wish to expose it's constants too. But this particular module contains a dependency which is provided at construction time i.e. dependency injection.

this is module1

const STORE_TYPE = {
  STORE1: 1,
  STORE2: 2
};

function service(dependency1) {
  this.dep = dependency1;
}

service.prototype.doSomething = function(param1, store) {
  if (STORE_TYPE.STORE1 == store) {
    return this.dep.get(param1);
  } else {
    return "something";
  }
};

module.exports = service;

I'm using module1 here:

var dep = require('./dep');
var dep1 = new otherService(dep);
var service = require('./service')(dep1);

function getData() {
  return service.doSomething(id, /*this is module1 constant*/1);
}

How do I refere to module1's constants if module1 has a constructor.

I don't wish to add separate method only to create service since callee needs to perform multiple steps.

Tu Nguyen · Accepted Answer · 2018-10-01 07:09:59Z

2

Try this:

service.js

exports.STORE_TYPE = {
  STORE1: 1,
  STORE2: 2
};

exports.service = function service(dependency1) {
  this.dep = dependency1;
}

service.prototype.doSomething = function(param1, store) {
  if (STORE_TYPE.STORE1 == store) {
    return this.dep.get(param1);
  } else {
    return "something";
  }
};

Using that module

app.js

const service = require('./service').service;

const STORE_STYLE = require('./service').STORE_TYPE;

answered Oct 1, 2018 at 7:09

Tu Nguyen

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