TypeScript, MongoDB and Reference Issues

Question

I've got a NodeJS app (built in Visual Studio) which uses TypeScript, and MongoDB.

I've written a small library which wraps the MongoDB driver in some TypeScript classes and just today it started acting up.

If I include this line at the top of one of my library files:

/// <reference path='./_scripts/typings/mongodb/mongodb.d.ts' />

it build briefly, before begining to complain about "Duplicate identifier"s, and lots of them, for example:

Error   6   Type name 'Transform' in extends clause does not reference constructor function for '"stream".Transform'.
Error   7   Type name 'events.EventEmitter' in extends clause does not reference constructor function for 'events.EventEmitter'.
Error   8   Duplicate identifier 'errno'.
Error   9   Duplicate identifier 'code'.
Error   10  Duplicate identifier 'path'.

So I take that out, and everything is briefly ok, until I start seeing issues reported around this line:

import mongodbNS = require('mongodb');

If I were to then remove that line, I would see errors with things like:

public Connect: () => Promise<mongodbNS.Db>;

I can muddle through by adding a removing things and taking advantage of the brief window of compilability which opens up - but clearly this is not the way.

What is?

an example of a duplicate identifier error message would be great — basarat
– basarat, Commented Sep 19, 2014 at 1:28
I'm using Node Tools for VS 2013, and they all come from node.d.ts. I've added some examples above. — Michael
– Michael, Commented Sep 19, 2014 at 1:33

basarat · Accepted Answer · 2014-09-19 01:37:02Z

5

and they all come from node.d.ts

This is happening because you have two versions of node.d.ts (i.e. different files on disk) in your project.

answered Sep 19, 2014 at 1:37

basarat

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10 Comments

Michael Over a year ago

That occurred to me as well, so I did a search and of course there are two. But they are both part of other d.ts files: socket.io.d.ts, and mongodb.d.ts, which are both used in the solution. So, which one do I get rid of?

basarat Over a year ago

@Michael the older one. They should be compatible.

basarat Over a year ago

And then fix the reference in the one that was referencing the older version

Michael Over a year ago

They are in two different projects in the solution, each one referencing a project-local version of node.d.ts, each of which says "// Type definitions for Node.js v0.10.1" - so which is older? This seems like a likely cause of the problem, but something isn't adding up.

Michael Over a year ago

I was able to remove the reference to node.d.ts in the mongodb.d.ts file (it doesn't appear to be necessary) and that seems to have made the problem go away.

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