poketype-sw-webpack.config-2.js

// webpack.config.js example
var OfflinePlugin = require('offline-plugin');

module.exports = {
    // ...
    plugins: [
        // ... other plugins
        // it's always better if OfflinePlugin is the last plugin added
        new OfflinePlugin({
            ServiceWorker: {
                // output to root level of project
                output: "../service-worker.js", 
              
                // prevent conflicts with minifiers
                minify: false 
            }
        }),
    ]
    // ...
}