Asynchronous function result in module initialization

Question

Assume this simple module:

var mongoose = require('mongoose-util');

mongoose.myOwnCreateConnection(function(err, connection) {
  if(err) {
     console.log('log error somehow and make it die');
     module.exports = null;
  } else { 
     module.exports = connection;
  }
});

It won't work obviously, but how to manage that calls in context module initialization? What is the best practice here? Do I need to use function declaration only in module init? Thanks in advance. I am asking because express has app module where everything is initialized.

mongoose createConnection doesn't take a function as its argument: mongoosejs.com/docs/api.html#index_Mongoose-createConnection — krl
– krl, Commented Aug 13, 2015 at 6:32
Sorry, that was a simplifying, I will edit this ridiculously insane example :) — Dawid Pura
– Dawid Pura, Commented Aug 13, 2015 at 6:33
What I want to achieve is to export connection object in module. That is example, code is more complex but it does not matter here, it is not working even for this. — Dawid Pura
– Dawid Pura, Commented Aug 13, 2015 at 6:35

Community · Accepted Answer · 2017-05-23 10:26:40Z

1

Require is synchronous operation. So this will not work, you can use this:

Asynchronous nodejs module exports

edited May 23, 2017 at 10:26

CommunityBot

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answered Aug 13, 2015 at 6:54

Hiren S.

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1 Comment

Dawid Pura Over a year ago

That is quite clean solution, but using this I will just 'delay' (or rather postpone) async to another module - because I am using this 'async' module in other 'sync' modules, so it will require to make another async modules etc. I hope you get my point, but this solution is really nice.

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