Unable to export module in another file in nodejs

Question

I am trying to create some dummy function in nodejs and trying to export it in another file but when I am running it using node index.js it might some sort of silly mistake but its showing error that:

TypeError: spr.comb is not a function

Below is my code:

spread.js

const comb = () => {
   const arr = [4,5,6];
   const newArr = [1,2,3,...arr];
   console.log(newArr);
}

module.exports = comb;

index.js

const spr =  require('./spread');
spr.comb();

Someone let me know what I am doing wrong.

I dont think spr.comb() is right. the spr has the comb reference. just do spr() — nithinpp
– nithinpp, Commented Sep 2, 2021 at 5:05

Yousaf · Accepted Answer · 2021-09-02 05:06:11Z

3

Problem is that you have completely overwritten the module.exports object.

module.exports is an empty object to which you can add the values to export from a module.

In your case, you have re-assigned the module.exports to comb function. So, to call the function, change

spr.comb();

to

spr();

For spr.comb() to work, you need to export the comb function as shown below:

module.exports.comb = comb;

or

exports.comb = { ... }

answered Sep 2, 2021 at 5:06

Yousaf

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Comments

Alireza Khaki · Accepted Answer · 2021-09-02 05:12:09Z

1

you can do it like this(in spread.js):

const comb = module.exports.comb = () => {
const arr = [4, 5, 6];
const newArr = [1, 2, 3, ...arr];
console.log(newArr);
}

answered Sep 2, 2021 at 5:12

Alireza Khaki

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Comments

Furqan Anwar · Accepted Answer · 2021-09-02 05:13:38Z

1

Can't use a user defined name here because you have exported comb from your spread file

const spr =  require('./spread'); 
spr.comb();

Use this instead

const comb = require('./spread');

If you want to use custom name you need to modify your spread file like this

module.exports = () => {
   const arr = [4,5,6];
   const newArr = [1,2,3,...arr];
   console.log(newArr);
}

Now you are exporting a function from spread, while importing/ including it in index.js you can provide a custom name to this function.

const {custom name comes here}=  require('./spread');

For Example

const comb = require('./spread');
const myCombFn = require('./spread');

answered Sep 2, 2021 at 5:13

Furqan Anwar

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Comments

mpmcintyre · Accepted Answer · 2021-09-02 05:19:50Z

0

If the function is not a default export you would need to surround it with curly braces in your main file like so:

const {spr} =  require('./spread');
spr.comb();

answered Sep 2, 2021 at 5:19

mpmcintyre

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