Cannot read property 'then' of undefined when create PromiseList

[stoyanmkd]

Hello, I'm newbie in Comb and I have the following problem with PromiseLists. I follow the documentation for PromiseLists and create following code:

var comb = require('comb');
    fs = require('fs');

function readFiles(){
	var files = comb.argsToArray(arguments).map(function(file){
		return fs.readFile(file);
	});
	return new comb.PromiseList(files, true).promise();
	
}

readFiles("1.txt", "2.txt", "3.txt").then(function(files){
	files.forEach(function(data){
		console.log(data);
	});
}, errorHandler);

When I run it, I got error:

/opt/dbtest/test2/node_modules/comb/lib/promise.js:529
            promise.then(
                   ^

TypeError: Cannot read property 'then' of undefined
    at wrapper.__addPromise (/opt/dbtest/test2/node_modules/comb/lib/promise.js:529:20)
    at forEach (/opt/dbtest/test2/node_modules/comb/lib/base/array.js:191:18)
    at wrapper.constructor (/opt/dbtest/test2/node_modules/comb/lib/promise.js:515:17)
    at spreadArgs (/opt/dbtest/test2/node_modules/comb/lib/base/functions.js:30:17)
    at new wrapper (/opt/dbtest/test2/node_modules/comb/lib/define.js:77:19)
    at spreadArgs (/opt/dbtest/test2/node_modules/comb/lib/base/functions.js:30:17)
    at wrapper.defineConstructor (/opt/dbtest/test2/node_modules/comb/lib/define.js:329:9)
    at readFiles (/opt/dbtest/test2/app.js:10:9)
    at Object.<anonymous> (/opt/dbtest/test2/app.js:14:1)
    at Module._compile (module.js:570:32)

I'm running it on Node 6.10.2, the version of Comb is 1.0.1

Thanks,
Stoyan

[dustinsmith1024]

I think you need to turn fs.readFile into a comb Promise. The examples all build off of each so, you can find the readFile non-standard lib one in at the top of the Promises doc. Try swapping the fs version out for the one in the docs.

Also, we don't run comb on node 6 internally so you might run into some bugs. It looks like the tests pass though.