NodeJS: use module.exports in function from another module

Question

Simple example:

file1

module.exports.foo = function(obj) {
  module.exports.obj = obj;
}

file2

file1 = require("file1")
var something = {a: "a"};
file1.foo(something); //export "something" being a part of file2

The example above is not working.

What I want is basically a module.exports helper, since I plan a few helpers for whole object "exportion".

Thank you

The code you have posted works exactly as you seem to expect. Test case: var f2 = require('./file2'); var f1 = require('./file1'); console.log(f1.obj); outputs { a: 'a' }. — lanzz
– lanzz, Commented Oct 1, 2012 at 12:13
When I try to access the "file2" module from a third file, the "file2" module is empty. I want to export objects from file2, but the act of export is happning in a function inside file1. — eSinxoll
– eSinxoll, Commented Oct 1, 2012 at 12:27

OnesimusUnbound · Accepted Answer · 2012-10-01 13:25:09Z

1

module in file1.js is a different instance from that in file2.js.

file1.js

module.exports.foo = function(obj) {
    module.exports.obj = obj; 
    return module;
}

file2.js

console.log("running file2");

file1 = require("./file1");

var something = {a: "a"}; 
var moduleOfFile1 = file1.foo(something); //export "something" being a part of file2 

console.log("file1 module: " + moduleOfFile1.id);
console.log("file2 module: " + module.id);

console:

node file2.js

id returned are different

Update

alternatively, why not update file2.js to extend its module.exports

File2.js

// well, you may copy `extend` implementation if you 
// do not want to depend on `underscore.js`
var _ = require("underscore");     
file1 = require("./file1");  

_.extend(module.exports, file1);

var something = {a: "a"};  
// or do something else

_.extend(module.exports, {
    obj: something
});

File3.js

file2 = require("./file2.js");
console.log(file2.obj.a);

edited Oct 1, 2012 at 13:25

answered Oct 1, 2012 at 13:03

OnesimusUnbound

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2 Comments

eSinxoll Over a year ago

Another question: why is "this" an empty object outside a function? I though the "module.exports" would belong to "this".

OnesimusUnbound Over a year ago

This may help you understand the confusing this in JavaScript. In summary, the value of this depends on where it's accessed.

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