CODEWITHSUNDEEP
javascriptimportecmascript-6export
Juicy
Juicy

Reputation: 12500

Export module class from another module

I have a module netmap that exports a default class NetMap:

export default class NetMap {...}

I have another module helloworld and I want to export (not as a default) the entire NetMap class so that another module can access NetMap by using:

import * as helloworld from 'helloworld'

const x = helloworld.NetMap()

Is this possible? What would the export of NetMap look like in the helloworld module?

Upvotes: 0

Views: 169

Answers (2)

Danziger
Danziger

Reputation: 21161

netmap.js

export default class NetMap {
    ...
}

helloworld.js (usually called a barrel):

import NetMap from './netmap.js';
import Foo from '...';
import ...

export {
    NetMap,
    Foo,
    ...
};

Then, in another module:

import * as helloworld from './helloworld.js';

const x = new helloworld.NetMap();

But I personally prefer to use named imports/exports, so I would do it like this instead:

netmap.js

export class NetMap {
    ...
}

helloworld.js (usually called barrel):

export { NetMap } from './netmap.js';
export { Foo } from '...';
export { ...

Then, in another module:

import * as helloworld from './helloworld.js';

const x = new helloworld.NetMap();

Or:

import { NetMap } from './helloworld.js';

const x = new NetMap();

Upvotes: 1

kyle
kyle

Reputation: 691

I think I can tell what you're trying to do, and it certainly seems possible. But do let me know if I misunderstood.

So you have your netMap file...

// netMap.js
class NetMap {
    constructor(a,b) {
        this.a = a
        this.b = b
    }
}

export default NetMap

then you have your helloworld file that uses netmap as well as maybe some other things....

// helloworld.js
const netMap = require('./netMap')
// import netMap from 'netMap'

const helloWorld = _ => console.log('hello world!')

module.exports = { netMap, helloWorld }
export { netMap, helloWorld }

and now you have a third file for which you're going to import all of hello world...

// otherModule.js
var helloWorld = require('./helloworld')
// import * as helloWorld from 'helloworld'
const x = new helloWorld.netMap(2,3)

console.log(x.a, x.b)

Upvotes: 0

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