Unable to load '@webpack-cli/serve' command. TypeError: devServerFlags is not iterable #1069
Description
After upgrading from v1.5 to v1.7 I get the following error when running encore dev-server
$ npx encore dev-server
Running webpack-dev-server ...
[webpack-cli] Unable to load '@webpack-cli/serve' command
[webpack-cli] TypeError: devServerFlags is not iterable
at /home/nik/dev/fleetman-app/node_modules/@webpack-cli/serve/lib/index.js:28:43
at WebpackCLI.makeCommand (/home/nik/dev/fleetman-app/node_modules/webpack-cli/lib/webpack-cli.js:104:31)
at ServeCommand.apply (/home/nik/dev/fleetman-app/node_modules/@webpack-cli/serve/lib/index.js:10:19)
at loadCommandByName (/home/nik/dev/fleetman-app/node_modules/webpack-cli/lib/webpack-cli.js:626:35)
at Command.<anonymous> (/home/nik/dev/fleetman-app/node_modules/webpack-cli/lib/webpack-cli.js:1091:23)
at Command.listener [as _actionHandler] (/home/nik/dev/fleetman-app/node_modules/webpack-cli/node_modules/commander/index.js:922:31)
at Command._parseCommand (/home/nik/dev/fleetman-app/node_modules/webpack-cli/node_modules/commander/index.js:1503:14)
at Command.parse (/home/nik/dev/fleetman-app/node_modules/webpack-cli/node_modules/commander/index.js:1292:10)
at Command.parseAsync (/home/nik/dev/fleetman-app/node_modules/webpack-cli/node_modules/commander/index.js:1318:10)
at WebpackCLI.run (/home/nik/dev/fleetman-app/node_modules/webpack-cli/lib/webpack-cli.js:1123:28)
My webpack.config.js file is
const Encore = require('@symfony/webpack-encore')
const MomentLocalesPlugin = require('moment-locales-webpack-plugin')
// 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/modules/app/index.ts')
.addEntry('admin', './assets/modules/admin/index.ts')
.addEntry('user', './assets/modules/user/index.ts')
.addStyleEntry('email', './assets/modules/email/index.scss')
.addStyleEntry('print', './assets/modules/print/index.scss')
// 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 Sass/SCSS support
.enableSassLoader()
// Enable PostSCSS support
.enablePostCssLoader()
// Enable TypeScript
.enableTypeScriptLoader()
// Enable Vue
.enableVueLoader(() => {}, { runtimeCompilerBuild: true })
// Enable hashed filenames (e.g. app.abc123.css)
.enableVersioning(Encore.isProduction())
// applies integrity="..." attributes on your script & link tags
.enableIntegrityHashes(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
})
.autoProvidejQuery()
.addPlugin(new MomentLocalesPlugin())
module.exports = Encore.getWebpackConfig()
Both dev and prod builds work fine.