__webpack_require__.O is not a function

[nicofilizzola]

I got my app.js and a pages/postMedia.js which are both imported in my twig file.

None of my postMedia.js functions are working and I get this message on the console:

Uncaught TypeError: __webpack_require__.O is not a function
    at postMedia.js:101
    at webpackJsonpCallback (jsonp chunk loading:43)
    at postMedia.js:1

My webpack config file: (Basically the default config with the pages/postMedia.js entrypoint)

const 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
     *
     * 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/app.js')
    .addEntry('postMedia', './assets/pages/postMedia.js')

    // enables the Symfony UX Stimulus bridge (used in assets/bootstrap.js)
    .enableStimulusBridge('./assets/controllers.json')

    // 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())

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

    // enables @babel/preset-env polyfills
    .configureBabelPresetEnv((config) => {
        config.useBuiltIns = 'usage';
        config.corejs = 3;
    })

    // enables Sass/SCSS support
    .enableSassLoader()

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

    // uncomment if you use React
    //.enableReactPreset()

    // 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()
;

module.exports = Encore.getWebpackConfig();

Sidenote: I tested the app yesterday and it worked perfectly, and today I'm having this problem after having changed absolutely nothing.

[nicofilizzola]

Also, I know for a fact that the problem has something to do with pages/postMedia.js. I commented the whole code in the file and the problem disappeared. However, there's no syntax error as it compiles without any problems

[nicofilizzola]

Someone should probably get this checked. I rechecked a couple of hours later without changing anything and the problem magically disappeared. I'm confused

[Dev0Pher]

It seems that in your postMedia.js file on line 101 you have a problem. It's not related to webpack-encore