webpack.config.js

var Encore = require('@symfony/webpack-encore');
var CopyWebpackPlugin = require('copy-webpack-plugin');

Encore
    // directory where compiled assets will be stored
    .setOutputPath('public/build/')
    // public path used by the web server to access the output path
    .setPublicPath('/build')
    // only needed for CDN's or sub-directory deploy
    //.setManifestKeyPrefix('build/')

    // Tell Webpack to *not* output a separate runtime.js file.
    .disableSingleRuntimeChunk()

    /*
     * ENTRY CONFIG
     *
     * Add 1 entry for each "page" of your app
     * (including one that's included on every page - e.g. "app")
     *
     * Each entry will result in one JavaScript file (e.g. app.js)
     * and one CSS file (e.g. app.css) if you JavaScript imports CSS.
     */
    .addEntry('app', './assets/js/app.js')

    // impossible, because webpack tries to find the included images
    //.addStyleEntry('AdminLTE.min.css', './assets/css/AdminLTE.min.css')

    .cleanupOutputBeforeBuild()
    .enableSourceMaps(!Encore.isProduction())
    // enables hashed filenames (e.g. app.abc123.css)
    .enableVersioning(Encore.isProduction())

    // uncomment if you use TypeScript
    //.enableTypeScriptLoader()

    // uncomment if you use Sass/SCSS files
    //.enableSassLoader()

    // uncomment if you're having problems with a jQuery plugin
    .autoProvidejQuery()

    .addPlugin(new CopyWebpackPlugin({
        patterns: [
            { from: './assets/images', to: 'images' }
        ],
    }))
;

module.exports = Encore.getWebpackConfig();