I'm following a tutorial on how to create a website with Symfony (so I'm new at this) on a french website, GraphikArt. I'm currently at the "Symfony Encore" part and I can't make it work when I have to require jQuery in my JS file while it's on my Twig file.

I'm working with Symfony 4.3.3 and Yarn 1.17.3. As the guy showed, I tried to make it work externally with that part at the end of my webpack.config.js :

var config = Encore.getWebpackConfig();config.externals.jquery = 'jQuery';module.exports = config;

I also tried some solutions foundable on this site but nothing seems to work.

My current files :

webpack.config.js

var Encore = require( '@symfony/webpack-encore' );// Manually configure the runtime environment if not already configured yet by the "encore" command.// 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 your JavaScript imports CSS.     */    .addEntry( 'app', './assets/js/app.js' )    //.addEntry('page1', './assets/js/page1.js')    //.addEntry('page2', './assets/js/page2.js')    // 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()    /*     * 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() )    // enables @babel/preset-env polyfills    .configureBabel( () => {    }, {        useBuiltIns: 'usage',        corejs: 3    } )    // enables Sass/SCSS support    .enableSassLoader()    // uncomment if you use TypeScript    //.enableTypeScriptLoader()    // uncomment to get integrity="..." attributes on your script & link tags    // requires WebpackEncoreBundle 1.4 or higher    //.enableIntegrityHashes(Encore.isProduction())    // uncomment if you're having problems with a jQuery plugin    .autoProvidejQuery()// uncomment if you use API Platform Admin (composer req api-admin)//.enableReactPreset()//.addEntry('admin', './assets/js/admin.js');var config = Encore.getWebpackConfig();config.externals.jquery = 'jQuery';module.exports = config;

app.js

/* * Welcome to your app's main JavaScript file! * * We recommend including the built version of this JavaScript file * (and its CSS file) in your base layout (base.html.twig). */// any CSS you require will output into a single css file (app.css in this case)require( '../css/app.css' );// Need jQuery? Install it with "yarn add jquery", then uncomment to require it.var $ = require( 'jquery' );global.$ = global.jQuery = $;require( 'select2' );console.log( 'Hello Webpack Encore! Edit me in assets/js/app.js' );

base.html.twig JavaScript part

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"        integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"        crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"        integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1"        crossorigin="anonymous"></script><script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"        integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM"        crossorigin="anonymous"></script>{{ encore_entry_script_tags( 'app' ) }}

As the tutorial shows, I want to use jQuery in app.js while it is linked in the base.html.twig file.

My problem is that when I save any change in the app.js, I receive this :

Error: ./assets/js/app.jsError: Can't resolve 'jquery' in 'C:\wamp\www\symfony4\assets\js'

How is it possible for the tutorial (and the solutions online too) to work for others but not for me?

Solution

In the webpack.config.js file, instead of :

var config = Encore.getWebpackConfig();config.externals.jquery = 'jQuery';module.exports = config;

and before the .autoProvidejQuery() line, write :

.addExternals(    {        jquery: 'jQuery'    })

Moreover, the problem was I wasn't using the proper command line. Use yarn encore dev.