can a exported variable be changed in the original file?

Question

first.js

var a='this is first.js'

module.exports=a;

second.js

var a=require('./first');

console.log(a);

output:this is first.js

if i change the content of 'a' in second.js will that reflect in first.js too? if not and if possible how to do it?

first.js

var a='this is first.js'

module.export=a;

second.js

var a=require('./first');

console.log(a);

Here is the answer: https://stackoverflow.com/questions/48168601/change-the-value-of-imported-variable-in-es6 — Almog Gabay, Jul 24 '19 at 11:04
Possible duplicate of [Change the value of imported variable in ES6](https://stackoverflow.com/questions/48168601/change-the-value-of-imported-variable-in-es6) — Hardik Shah, Jul 24 '19 at 11:06
No. The reverse is possible with ES6 modules, but not in CommonJS modules. There you can only share and manipulate an exports object. — Bergi, Jul 24 '19 at 11:21

score 1 · Accepted Answer · answered Jul 24 '19 at 11:29

You need to pass an object instead of string.

first.js

var a = {

    txt : 'this is first.js'
}

function too() {
    console.log(a.txt);
}
module.exports = { foo: a, too:too };

in the app.js , you can modify it and it will be reflected eveywhere

var a = require("./first");
a.foo.txt = 'hahaha';
console.log(a.foo.txt);
a.too();

I hope it helps.

score 0 · Answer 2 · answered Jul 24 '19 at 11:25

No. Assigning to a in the second module only changes the local variable, nothing else.

how to do it?

Export an object, not a single value. Then you can modify its properties from everywhere.

// first.js
module.exports.a = 'this is first.js';

// second.js
var first = require('./first');
console.log(first.a);
first.a = 'this is something else';

2 Answers2