Webpack plugin to collect different stylesheets.

sass-collector.js

var ModuleParserHelpers = require('webpack/lib/ModuleParserHelpers');
var NullFactory = require('webpack/lib/NullFactory');
var _ = require('lodash');
var path = require('path');
var sass = require('node-sass');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var ExtractTextPlugin__dirname = path.dirname(
    require.resolve('extract-text-webpack-plugin'));

var visited = {};
var currentCounter = 0;
var cssOutput = {};

function getNodes(root)  {
    if (root.dependencies) {
        root.dependencies.forEach(function (child) {
            if ( child.module && child.module.userRequest && !visited[child.module.userRequest]) {
                //console.log('child request', child.module.userRequest);
                visited[child.module.userRequest] = true;
                getNodes(child.module);
            }
        });
    }
}

function apply(options, compiler) {

    var testString = 'scss';
    var re = new RegExp('' + testString + '', 'g');
    function filterFunction (collection, key, regex) {
        return _.filter(collection, function(obj){ return obj[key].match(regex);});
    }

    compiler.plugin("compile", function(params) {
        //console.log("in compile", params);
    });


    compiler.plugin("compilation", function(compilation) {
        console.log('in compilation');

        compilation.plugin('revive-modules', function(modules, records) {
            //handle to the module during tree optimization
            console.log('revive-modules length', modules.length);
            var cssKeys = _.keys(cssOutput);
            console.log(cssKeys);
            modules.forEach(function(value){
                //console.log(value.userRequest, value.debugId);
                if (cssKeys.indexOf(value.debugId.toString()) > -1) {
                    console.log('found match', value);
                }

            });

        });

        compilation.plugin("optimize-chunks", function (chunks) {

            //there's only one chunk at this point

            chunks.forEach(function (chunk) {

                console.log('\noutput chunk name', chunk.name);

                chunk.modules.forEach(function (module){

                    if (module.loaders && module.loaders.join().indexOf('collect-sass') > -1) {

                        //console.log(module);

                        var moduleRequest =  module.debugId;
                        console.log('found module', moduleRequest);
                        getNodes(module);

                        //get paths for match
                        var foundPaths = [];

                        _.mapKeys(visited, function(value, key) {
                            if (re.test(key.toString())) {
                                //console.log('scss', key);
                                foundPaths.push(key);
                            }
                        });

                        cssOutput[moduleRequest] = [];

                        for (var i = 0; i < foundPaths.length; i++) {
                            var result = sass.renderSync({
                                file: foundPaths[i]
                            });

                            cssOutput[moduleRequest].push(result.css.toString());
                        }

                        //console.log(cssOutput);

                        compiler.cssOutput = cssOutput;
                        //console.log(this);
                    }

                });


            });


        });


    });

  
}

module.exports = function(options) {
    if (options instanceof Array) {
        options = {
            include: options
        };
    }

    if (!Array.isArray(options.include)) {
        options.include = [ options.include ];
    }

    return {
        apply: apply.bind(this, options)
    };
};