Exporting Objects with the Exports Object

Question

Say I have one .js file containing a javascript object. I want to be able to access that object and all of its functionality from another .js file in t

Answer 1

This is the way I create modules:

myModule.js

var MyObject = function() {

    // This is private because it is not being return
    var _privateFunction = function(param1, param2) {
        ...
        return;
    }

    var function1 = function(param1, callback) {
        ...
        callback(err, results);    
    }

    var function2 = function(param1, param2, callback) {
        ...
        callback(err, results);    
    }

    return {
        function1: function1
       ,function2: function2
    }
}();

module.exports = MyObject;

And to use this module in another JS file, you can simply use require and use your object as normal:

someFile.js

var myObject = require('myModule');

myObject.function1(param1, function(err, result) { 
    ...
});

Answer 2

In one file:

module.exports.myObj = some object...;

In the other:

Obj = require('myFile.js').myObj;

Everything in a js file on node is local to that file unless you put it in the export object. This actually is very different from JavaScript in a browser--in the browser all files that get imported act together like one big file.

You can kinda think about node files as though you are creating a module object and passing it' into a function surrounding your code.

module = { 'exports' : {} };
(function(module){
    //your js file
    ...
})(module)

Answer 3

the simplest approach, in my opinion:

write Person.js: (note it comes with ctor)

module.exports = function (firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.fullName = function () { 
        return this.firstName + ' ' + this.lastName;
    }
}

and consume it:

var person = require('./Person.js');

var person1 = new person('James', 'Bond');

console.log(person1.fullName());

note that in this simple solution all methods are "public".

ref: https://www.tutorialsteacher.com/nodejs/nodejs-module-exports

Answer 4

Of course you can. In my example I use obj to hold my config info. I put it in a file called index.js in config folder. This makes the index the preferred choice to be picked when I import 'config'. I have 2 exports here one for my node and api stuff and the other for my db. You can ignore the first bit where I set the environment.

const environment = {
  development: {
    isProduction: false
  },
  production: {
    isProduction: true
  }
}[ process.env.NODE_ENV || 'development' ];

export default Object.assign({
  host: 'localhost',
  port: '3000',
  remoteApi: {
    token: {
      'X-Token': '222222222222222222'
    },
    base: 'https://www.somedomain.com/api'
  }
}, environment);

export const db = {
  dbHost: 'localhost',
  dbPort: 176178
};

Calling import config from '../config'; will pick the default one. And if I specify I can get the db export import { db } from '../config';