Not copying to build directory

Hi there,

Thanks for creating this library.

I just tried to get this working and encountered a problem - not sure if it's memfiles or if its just how rjs works.

Given the example in the Readme (which works when the file doesn't have any dependencies):

var fs = require( "js" );
var requirejs = require( "requirejs-memfiles" );

var files = {
  "main.js": fs.readFileSync( "./main.js" ),
  ...
}

requirejs.setFiles( files, function( done ) {
  requirejs.optimize({
    appDir: ".",
    baseUrl: ".",
    dir: "dist",
    modules: [{
        name: "output",
        include: "main",
        create: true
    }]
  }, function() {
    var output = files[ "dist/output.js" ];
    ...
    done();

  }, function( error ) {
    // handle error
    ...
    done();

  });
});

Now, if we set main.js content to look like the following so it has a dependency to another module:

define("Main", ["require", "exports", "ModuleA"], function (require, exports, moduleA) {
    "use strict";

    
});

And then you include this additional file:

var moduleAContents = "define(\"ModuleA\", [\"require\", \"exports\"], function (require, exports) {\r\n    \"use strict\";\r\n});";

var files = {
  "main.js": fs.readFileSync( "./main.js" ),
   "ModuleA.js": moduleAContents,
}

Now, during the optimisation, the rjs optimiser requests a file from the in memory files on the path: dist/ModuleA.js . This file doesn't exist.

Rjs doesn't appear to copy the ModuleA file from its original location, to the build directory, and then it requests it from the build directory location - and it isn't there.

If I change the "modules" config to list each module independently -like this:

modules: [{
        name: "Main",
           },{
        name: "ModuleC",
           }]

When I do that, rjs now copies each of the files to the built location, and optimisation succeeds.

In the case that I wish to optimise a single file, that has dependencies, i'm not sure the best way to do this using memfiles at the moment due to this issue.

Any pointers greatly appreciated.

Start with the README example and the requirejs.setFiles() path described in the report. Reproduce optimization with main.js depending on ModuleA.js and inspect why the optimizer requests dist/ModuleA.js without copying it. Done means the single-module optimization succeeds with in-memory dependencies and the relevant behavior is covered by a regression test.