Exporting function in ES6 / react

Question

On the server side (nodejs/express), I have no problems in exporting and referencing this file (using Attempt1).

// collectionFile.js
function collection() {
    let data = {};
    function getData(key) {
        return data[key];
    }
    function setData(key, value) {
        data[key] = value;
    }
    return {
        getData: getData,
        setData: setData
    };
}

const instanceOfCollection = collection();

On the client side (React), I'm just not able to reference and access the getData function. Below are some of the combination I tried. None of them work. How can I make it work ?

// Attempt1: export
// module.exports.getter = instanceOfCollection.getData;

// Attempt1: import
// const getter = require('./collectionFile').getter;
// Uncaught TypeError: getter is not a function

// Attempt2: export
// export default { instanceOfCollection };

// Attempt2: import
// import instanceOfCollection from './collectionFile';
// const instance = instanceOfCollection.getData;
// Uncaught TypeError: Cannot read property 'getData' of undefined

// Attempt3: export
// export const instanceOfCollection = collection();

// Attempt3: import
// import { instanceOfCollection } from './collectionFile';
// const instance = instanceOfCollection.getData;
// Uncaught TypeError: Cannot read property 'getData' of undefined

Edit: Turns out that I was referencing File A from File B and also File B from File A earlier

Are you using and module bundler or is it just several javascript files? — Axnyff
– Axnyff, Commented Dec 29, 2017 at 11:51
There are just 2 files in the same folder. I'm importing the collectionFile.js from the other file. Note that I don't have any problem exporting constants — Kaya Toast
– Kaya Toast, Commented Dec 29, 2017 at 11:52

Vegas · Accepted Answer · 2020-04-23 14:27:44Z

8

There are a lot of ways to do such things:

ES5 export

module.export = instanceOfCollection

then

var getData = require('my_module').getData
ES6 export

export default instanceOfCollection

then

import { getData, setData } from 'my_module'
ES6 named export

export const setter = instanceOfCollection.setData export const getter = instanceOfCollection.getData

then

import { setter, getter } from 'my_module'

or

import * as myCollection from 'my_module' myCollection.getter() myCollection.setter()
ES5 with renaming

module.export = { getter: instanceOfCollection.getData, setter: instanceOfCollection.setData, }

then

const { setter, getter } = require('my_module')

or

const getter = require('my_module').getter const setter = require('my_module').setter

Hope some of them will work for you.

edited Apr 23, 2020 at 14:27

Vegas

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answered Dec 29, 2017 at 11:56

The Reason

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5 Comments

Kaya Toast Over a year ago

import { getData, setData } from 'my_module' doesn't work. I'm trying the others.

The Reason Over a year ago

@KayaToast Do you see how i'm exporting it? Without curly brackets!

Kaya Toast Over a year ago

Yes, I was careful about the braces. I have tried them all. None of them work. Thanks for the suggestions.

The Reason Over a year ago

@KayaToast I'm not sure what you are doing, but i'm testing it right now on my machine and it works well.

Kaya Toast Over a year ago

Your last method works when I try to reference from a different file. Turns out that I was referencing File A from File B and also File B from File A earlier.

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