How to use the cson.requireFile function in cson

var path = require('path'),
    fs = require('fs'),
    webpack = require("webpack"),
    libPath = path.join(__dirname, 'lib'),
    distPath = path.join(__dirname, 'dist'),
    pkg = require('./package.json'),
    cordovaLib = require('cordova').cordova_lib,
    extend = require('util')._extend,
    deepExtend = require('deep-extend'),
    CSON = require('cson'),
    projectConfig = deepExtend(CSON.requireFile('./config/config.default.cson'), CSON.requireFile('./config/config.cson')),
    webpackConfig = require('./webpack.config.js'),
    HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = extend(webpackConfig, {
    plugins: [
        new HtmlWebpackPlugin({
            filename: 'index.html',
            pkg: pkg,
            serviceWorkerEnabled: projectConfig.serviceWorker.enabled,
            appVersion: getAppVersion(),
            template: path.join(libPath, 'index.html')
        }),
        new webpack.ContextReplacementPlugin(/moment\/locale$/, getRegexAutorizedLanguages()),
        new webpack.DefinePlugin({
            IS_PROD: true
        }),

var path = require('path'),
    fs = require('fs'),
    _ = require('lodash'),
    webpack = require("webpack"),
    libPath = path.join(__dirname, 'lib'),
    wwwPath = path.join(__dirname, 'www'),
    pkg = require('./package.json'),
    cordovaLib = require('cordova').cordova_lib,
    deepExtend = require('deep-extend'),
    CSON = require('cson'),
    projectConfig = deepExtend(CSON.requireFile('./config/config.default.cson'), CSON.requireFile('./config/config.cson')),
    HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
    entry: path.join(libPath, 'index.coffee'),
    output: {
        path: wwwPath,
        filename: 'bundle-[hash:6].js'
    },
    module: {

        noParse: [/autoit.js/],

        loaders: [{
            test: /[\/]highlight\.js$/,
            loader: 'expose?hljs'
        }, {

var path = require('path');
var webpack = require('webpack');
var ionicWebpackFactory = require(process.env.IONIC_WEBPACK_FACTORY);
var deepExtend = require('deep-extend');
var cordovaLib = require('cordova').cordova_lib;
var CSON = require('cson');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ModuleConcatPlugin = require('webpack/lib/optimize/ModuleConcatenationPlugin');

var defaultConfig = CSON.requireFile('./src/config.default.cson');
var configOverwrite = CSON.requireFile('./config/config.cson');

const RawConfig = deepExtend(defaultConfig, configOverwrite);

var prodPlugins = [];
if (process.env.IONIC_ENV === 'prod') {
  prodPlugins.push(new ModuleConcatPlugin());
}

const webpackConfig = {
  entry: process.env.IONIC_APP_ENTRY_POINT,
  output: {
    path: '{{BUILD}}',
    publicPath: 'build/',
    filename: '[name].js',
    devtoolModuleFilenameTemplate: ionicWebpackFactory.getSourceMapperFunction(),

var path = require('path');
var webpack = require('webpack');
var ionicWebpackFactory = require(process.env.IONIC_WEBPACK_FACTORY);
var deepExtend = require('deep-extend');
var cordovaLib = require('cordova').cordova_lib;
var CSON = require('cson');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ModuleConcatPlugin = require('webpack/lib/optimize/ModuleConcatenationPlugin');

var defaultConfig = CSON.requireFile('./src/config.default.cson');
var configOverwrite = CSON.requireFile('./config/config.cson');

const RawConfig = deepExtend(defaultConfig, configOverwrite);

var prodPlugins = [];
if (process.env.IONIC_ENV === 'prod') {
  prodPlugins.push(new ModuleConcatPlugin());
}

const webpackConfig = {
  entry: process.env.IONIC_APP_ENTRY_POINT,
  output: {
    path: '{{BUILD}}',
    publicPath: 'build/',
    filename: '[name].js',
    devtoolModuleFilenameTemplate: ionicWebpackFactory.getSourceMapperFunction(),
  },