Webpack loader for generating configuration from script variables

configLoader.js

// Config loader reads command line args (in a build script) and outputs a new config file
// this approach was used to build different versions of a Chrome extension

//configLoader
const replaceCommandLineArgs = require('./replaceCommandLineArgs');
const configTemplate = require('./appConfig');

module.exports = function() {
    const config = replaceCommandLineArgs(configTemplate);
    return `module.exports = ${JSON.stringify(config)};`;
};

//appConfig.js:

// module.exports = {
//     socketHost: {
//         defaultValue: 'http://127.0.0.1',
//         cmdLineArgName: 'socket-host'
//     },
//     socketPort: {
//         defaultValue: 3000,
//         cmdLineArgName: 'socket-port'
//     }
// };

//webpack config:

// module.exports = {
//     entry: {
//         ...
//     },
//     output: {
//         ...
//     },
//     module: {
//         loaders: [{
//             test: /\.js$/,
//             include: [
//                 path.resolve(__dirname, 'js'),
//                 path.resolve(__dirname, 'popup')
//             ],
//             loader: 'babel-loader'
//         }, {
//             test: /appConfig\.js$/,
//             loader: __dirname + '/js/config/configLoader.js'
//         }]
//     },
//     devtool: 'source-map'
// };