I have the following code which is working OK. Now I need to add additional properties and functions and export them, How it's remended to do it? lets say I've two functions and two additional properties which I need to export.

properties like isValid prop1

var internal = require("../plu/internal");
module.exports = {isAvailable: false};

internal.eventEmitter.on('AppA', function () {
    module.exports.isAvailable = true;
});

I have the following code which is working OK. Now I need to add additional properties and functions and export them, How it's remended to do it? lets say I've two functions and two additional properties which I need to export.

properties like isValid prop1

var internal = require("../plu/internal");
module.exports = {isAvailable: false};

internal.eventEmitter.on('AppA', function () {
    module.exports.isAvailable = true;
});

• javascript
• node.js
• require

• If you can have a default value on all, you could just do this module.exports = {isAvailable: false, something: "Hello", somethingElse: "Hullo"}; and then have your event setters – magnudae Commented Jan 19, 2016 at 13:08
• Do you want to extend an existing class? Is this your intention? – Pho3nixHun Commented Jan 19, 2016 at 13:10
• Do you want to export setter and getter functions as properties of the exported object/module? – Endre Simo Commented Jan 19, 2016 at 13:11
• @SimoEndre correct this is what I need – 07_05_GuyT Commented Jan 19, 2016 at 13:20
• @magnudae - Thanks but how should I do it with the functions also can you provide example? – 07_05_GuyT Commented Jan 19, 2016 at 13:20

3 Answers 3

The standard way to defined setter and getter methods on an object is to use the Object.defineProperty method inside your internal module. By exporting the internal module you will export the setter and getter methods too.

Object.defineProperty(Internal.prototype, "isAvailable", {
    get : function(){
        return this.available;
    },
    set : function(value){
        this.available = value;
    }
});

or in ES6 you can write the same thing as:

get isAvailable() {
    return this.available;
}

set isAvailable(value) {
    this.available = value;
}

With Internal.prototype you are extending the base object prototype with setter and getter methods.

This is an easy straight forward way. Correct me if I misunderstood. This will expose the getters and setters for everyone who requires this file. Unless you want to emit changes when they happen and only then this might not be the answer.

var available = false;
module.exports = {
  getAvailable: getAvailable,
  setAvailable: setAvailable
}
function getAvailable() { return available;}
function setAvailable(avail) { available = avail;}

Use below code, if it can solve your problem ?

var exports = module.exports = {};

var internal = require("../plu/internal");

exports.isAvailable = false;

internal.eventEmitter.on('AppA', function () {
    exports.isAvailable = true;
});

exports.myTestFunc = function () {
     return "Hello Test";
}

exports.testProperty = true;