How do we export list of constants and functions from a javascript module

Question

I have to export 2 type of constants and few functions like getUser.

mymodule.js

const type1 = require('./constants1.js');
const type2 = require('./constants2.js');
module.exports = Object.freeze(Object.assign(Object.create(null), type1, type2))

constants1.js

module.exports = Object.freeze({
  DOUBLE: 1,
  FLOAT: 2
})

consumer.js

const udb = require('./mymodule.js');
console.log(udb.DOUBLE);

Now I also want to export function like getUser , how do i change mymodule.js to export the functions too , so that consumer.js can call udb.getUser

something like this but it doesnt work, Please suggest.

module.exports = Object.freeze(Object.assign(Object.create(null), type1, type2)), getUser: function() {}

You can wrap into a object like this - module.exports ={a: Object.freeze(Object.assign(Object.create(null), type1, type2)), b:getUser()} — Gulshan Aggarwal
– Gulshan Aggarwal, Commented Jul 5, 2022 at 15:47
This makes consumer.js to use udb.a.DOUBLE instead of udb.DOUBLE, right? I dont want to change in the consumer.js calling pattern — Sudarshan Soma
– Sudarshan Soma, Commented Jul 5, 2022 at 16:25
then don't give name a & b to keys. keep it what you want & destructure it — Gulshan Aggarwal
– Gulshan Aggarwal, Commented Jul 6, 2022 at 6:17
you mean something like this {Object.freeze(Object.assign(Object.create(null), type1, type2)), getUser()} ? . I get SyntaxError: Unexpected token '.' for Object.freeze — Sudarshan Soma
– Sudarshan Soma, Commented Jul 6, 2022 at 7:00

Patrice Thimothee · Accepted Answer · 2022-07-06 07:30:21Z

1

constant1.js

module.exports = Object.freeze({
    DOUBLE: 1,
    FLOAT: 2
});

constant2.js

module.exports = Object.freeze({
    TRIPLE: 3,
});

mymodules.js

const getUser = ()=> console.log("Something");
const getId = ()=>console.log("Something2");

const type1 = require("./constants1.cjs");
const type2 = require("./constants2.cjs");

const udb = Object.assign(Object.create(null), type1, type2);
udb.getUser = getUser;
udb.getId = getId;
module.exports = Object.freeze( udb );

consumer.js

const udb = require("./mymodule.cjs");
console.log(udb.DOUBLE);

// udb.getUser();                    
// udb.getId();

EDIT: Added a complete example

EDIT 2: Simpler

edited Jul 6, 2022 at 7:30

answered Jul 6, 2022 at 0:35

Patrice Thimothee

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3 Comments

Sudarshan Soma Over a year ago

Thanks for complete example. consumer.js code is something I cant ask them to change. Its like this udb = require("./mymodule.js"); udb.DOUBLE; udb.getUser(). I am trying to change library (mymodules.js) to split constants in mymodule.js to different js files based on their type and possibly include statically/dynamically.

Patrice Thimothee Over a year ago

Hi @SudarshanSoma, I have edited my answer to reflect the consumer.js limitation.

Patrice Thimothee Over a year ago

You're welcome (<- I believe the system automatically deletes these types of messages, so you may not see them).

Ilijanovic · Accepted Answer · 2022-07-06 07:38:14Z

1

You could use spread operator

const type1 = require('./constants1.js');
const type2 = require('./constants2.js');

function getId() {}
function getUser() {}

module.exports = Object.freeze({ getId, getUser, ...type1, ...type2 })

answered Jul 6, 2022 at 7:38

Ilijanovic

15k4 gold badges29 silver badges63 bronze badges

3 Comments

Patrice Thimothee Over a year ago

Dear Bill.Gates, I want to point out that we all offer a similar solution to the OP (Reading @Gulshan Aggarwal's comments, now). An important thing to notice is that we all have solved the export issue the same way.

Ilijanovic Over a year ago

@PatriceThimothee what do you want to say with this?

Patrice Thimothee Over a year ago

@bill.gates, I Apologise if it came up the wrong way. The OP wanted to take another direction in maybe solving this exporting issue. The three of us came up with the same solution, so it would be great for OP to be aware of this, so this solution is considered rather than thinking something more drastic.

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