webpack.config.js

// webpack.config.js
const Encore = require('@symfony/webpack-encore');

// It's useful when you use tools that rely on webpack.config.js file.
if (!Encore.isRuntimeEnvironmentConfigured()) {
  Encore.configureRuntimeEnvironment(process.env.NODE_ENV || 'dev');
}

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/')

    /*
     * 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', './resources/static/app.js')
    .addEntry('admin', './resources/static/admin.js')
    .addEntry('search', './resources/static/search.js')

    // Any .ts files that you require will be processed correctly.
    //.enableBabelTypeScriptPreset({ isTSX: true, allExtensions: true })
    //.enableTypeScriptLoader()

    // When enabled, Webpack "splits" your files into smaller pieces for greater optimization.
    .splitEntryChunks()

    // will require an extra script tag for runtime.js
    // but, you probably want this, unless you're building a single-page app
    .enableSingleRuntimeChunk()

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

    // will load SASS files.
    .enableSassLoader(options => {}, { resolveUrlLoader: false })
    .enablePostCssLoader(options => {
      options.postcssOptions = {
        plugins: [
            require('autoprefixer'),
        ]
      }
    })

    /*
     * FEATURE CONFIG
     *
     * Enable & configure other features below. For a full
     * list of features, see:
     * https://symfony.com/doc/current/frontend.html#adding-more-features
     */
    .cleanupOutputBeforeBuild()
    .enableBuildNotifications()
    .enableSourceMaps(!Encore.isProduction())

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

    // uncomment to get integrity="..." attributes on your script & link tags
    // requires WebpackEncoreBundle 1.4 or higher
    //.enableIntegrityHashes(Encore.isProduction())

    .configureBabel((config) => {
        config.plugins.push('@babel/plugin-proposal-class-properties');
    })

    // enables @babel/preset-env polyfills
    .configureBabel(() => {}, {
        useBuiltIns: 'usage',
        corejs: 3
    })

    // uncomment if you're having problems with a jQuery plugin
    .autoProvidejQuery()
    .autoProvideVariables({
        "window.Bloodhound": require.resolve('bloodhound-js'),
        "jQuery.tagsinput": "bootstrap-tagsinput"
    })
;

module.exports = Encore.getWebpackConfig();