config.js

var fs   = require('fs'),
    path = require('path'),
    Y    = require('yui/oop'),

    CONFIG_FILE = 'config.json',
    NODE_ENV    = process.env.NODE_ENV,
    PORT        = process.env.PORT,

    ENV = {
        development: NODE_ENV !== 'production',
        production : NODE_ENV === 'production'
    },

    appRoot    = process.cwd(),
    configFile = path.join(__dirname, CONFIG_FILE),
    yuiFilter  = ENV.production ? 'min' : 'raw',
    config;

// Poor-mans object clone.
function clone(config) {
    return JSON.parse(JSON.stringify(config));
}

// Wrap crazy YUI API.
function mix(config, overrides) {
    return Y.mix(config, overrides, true, null, 0, true);
}

if (fs.existsSync(configFile)) {
    try {
        config = JSON.parse(fs.readFileSync(configFile, 'utf8'));
    } catch (e) {
        console.error('Could not parse config file.');
    }
} else {
    console.error('Could not read config file: ' + configFile);
}

// Quit if we cannot process the config file.
if (!config) {
    process.exit(1);
}

config.env  = ENV;
config.port = PORT || config.port;

Y.Object.each(config.dirs, function (dir, name, dirs) {
    dirs[name] = path.join(appRoot, dir);
});

// YUI on the server.
mix(config.yui.server, {
    filter: yuiFilter,

    groups: {
        server: {
            base   : appRoot,
            filter : yuiFilter,
            modules: clone(config.yui.modules.server)
        },

        shared: {
            base   : path.join(appRoot, config.yui.server.groups.shared.base),
            filter : yuiFilter,
            modules: clone(config.yui.modules.shared)
        }
    }
});

// YUI on the client.
mix(config.yui.client, {
    combine: ENV.production,
    filter : yuiFilter,

    groups: {
        client: {
            combine: ENV.production,
            filter : yuiFilter,
            modules: clone(config.yui.modules.client)
        },

        shared: {
            combine: ENV.production,
            filter : yuiFilter,
            modules: clone(config.yui.modules.shared)
        }
    }
});

// Remove modules from parsed YUI config.
delete config.yui.modules;

module.exports = config;

config.json

{
    "name" : "Photos Near Me",
    "title": "Photos Near Me",
    "port" : 3000,

    "dirs": {
        "pub"      : "public/",
        "views"    : "views/",
        "shared"   : "shared/",
        "templates": "shared/templates/"
    },

    "layouts": {
        "main": "layouts/main"
    },

    "flickr": {
        "api_key": "0984607e2222db7a1be6a5692741ca08"
    },

    "typekit": {
        "id": "wkh7ffm"
    },

    "yui": {
        "version": "3.7.3",

        "modules": {
            "shared": {
                "pnm-place": {
                    "path"    : "models/place.js",
                    "requires": [
                        "cache-offline",
                        "gallery-model-sync-yql",
                        "model",
                        "yql"
                    ]
                },

                "pnm-photo": {
                    "path"    : "models/photo.js",
                    "requires": [
                        "gallery-model-sync-yql",
                        "cache-offline",
                        "model",
                        "pnm-place",
                        "yql"
                    ]
                },

                "pnm-photos": {
                    "path"    : "models/photos.js",
                    "requires": [
                        "cache-offline",
                        "gallery-model-sync-yql",
                        "model-list",
                        "pnm-photo",
                        "yql"
                    ]
                }
            },

            "client": {
                "ios-oc-fix": "/vendor/ios-orientationchange-fix.js",

                "pnm-templates": {
                    "fullpath": "/templates.js",
                    "requires": ["handlebars-base"]
                },

                "pnm-grid-view": {
                    "path"    : "views/grid.js",
                    "requires": [
                        "node-style",
                        "node-screen",
                        "pnm-templates",
                        "view"
                    ]
                },

                "pnm-lightbox-view": {
                    "path"    : "views/lightbox.js",
                    "requires": [
                        "event-key",
                        "pnm-templates",
                        "transition",
                        "view"
                    ]
                },

                "pnm-no-location-view": {
                    "path"    : "views/no-location.js",
                    "requires": [
                        "pnm-templates",
                        "view"
                    ]
                },

                "pnm-app": {
                    "path"    : "app.js",
                    "requires": [
                        "app-base",
                        "app-transitions",
                        "gallery-geo",
                        "pnm-grid-view",
                        "pnm-lightbox-view",
                        "pnm-no-location-view",
                        "pnm-photos",
                        "pnm-place",
                        "pnm-templates"
                    ]
                }
            },

            "server": {
                "gallery-model-sync-yql": {
                    "path": "/vendor/gallery-model-sync-yql/gallery-model-sync-yql-min.js",

                    "requires": [
                        "model",
                        "yql"
                    ],

                    "optional": [
                        "cache",
                        "cache-offline"
                    ]
                }
            }
        },

        "server": {
            "useSync": true,
            "combine": false,

            "groups": {
                "server": {},

                "shared": {
                    "base": "shared/js/"
                }
            }
        },

        "client": {
            "allowRollup": false,

            "groups": {
                "client": {
                    "base"     : "/js/",
                    "comboBase": "/combo?",
                    "root"     : "/"
                },

                "shared": {
                    "base"     : "/js/",
                    "comboBase": "/shared/combo?",
                    "root"     : "/"
                }
            }
        }
    }
}