Registry / devops / webpack-dev-server-speedy

webpack-dev-server-speedy

library3.1.1jsnpmunverified

webpack-dev-server is a development server for webpack that provides live reloading and HMR. Current stable version is v5.2.3, released Jan 2026, with active development and monthly releases. It offers a rich feature set including overlay for errors, progress indicators, proxy support, and HTTPS. Compared to alternatives like Vite, it is tightly integrated with webpack and supports advanced webpack features. Requires webpack >=4. Notable changes: v5 major breaking change with ESM export, v5.2.1 security hardening on CORS.

devops web-framework

npm install webpack-dev-server-speedy

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · WEBPACK-DEV-SERVER

webpack-dev-server-speedy

devopsjavascriptv3.1.1

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

webpackDevServer

✓ import WebSocketServer from 'webpack-dev-server/server';

✗ import webpackDevServer from 'webpack-dev-server';

Since v5, webpack-dev-server uses named exports; default export is removed.

Server

✓ const WebpackDevServer = new (require('webpack-dev-server')).Server(compiler, options);

✗ const WebpackDevServer = new (require('webpack-dev-server'))(compiler, options);

For CJS in v5, use .Server constructor.

setupDevServer

✓ const { createConfig } = require('webpack-dev-server');

✗ const createConfig = require('webpack-dev-server').createConfig;

createConfig was removed in v5; use webpack-dev-server's config directly.

Minimal webpack-dev-server setup with hot module replacement, static serving, and API proxy.

// webpack.config.js const path = require('path'); const HtmlWebpackPlugin = require('html-webpack-plugin'); module.exports = { mode: 'development', entry: './src/index.js', output: { path: path.resolve(__dirname, 'dist'), filename: 'bundle.js', clean: true, }, devServer: { static: './dist', hot: true, port: 3000, open: true, proxy: { '/api': 'http://localhost:8080', }, }, plugins: [new HtmlWebpackPlugin({ template: './src/index.html' })], }; // Run with: npx webpack serve --config webpack.config.js

webpack-dev-server --version

Debug

Known issues

breakingv5.2.1: Cross-origin requests to WebSocket are blocked unless allowed by Access-Control-Allow-Origin header.

fix

Configure allowedHosts option or ensure Host header matches Origin.

affects: >=5.2.1

breakingv5.0.0: Default export removed; use named export 'Server'.

fix

Use 'const { Server } = require('webpack-dev-server');'

affects: >=5.0.0

deprecatedv5.0.0: 'contentBase' option replaced by 'static'.

fix

Use 'static' directory option instead.

affects: >=5.0.0

deprecatedv4.0.0: 'publicPath' option deprecated; use output.publicPath.

fix

Set output.publicPath in webpack config.

affects: >=4.0.0

gotchaUsing 'hot: true' requires 'webpack.HotModuleReplacementPlugin' or mode 'development'.

fix

Either set mode to 'development' or add the plugin manually.

affects: *

gotchaIf 'disableHostCheck: true' is used, security warning is shown.

fix

Use 'allowedHosts: 'all'' or configure specific hosts.

affects: >=4

Errors

Common errors & fixes

Error: Cannot find module 'webpack-dev-server'

Package not installed locally.

fix

Run 'npm install --save-dev webpack-dev-server'

TypeError: webpackDevServer is not a constructor

Using default import in v5 when named export is needed.

fix

Use 'const Server = require('webpack-dev-server').Server;'

EACCES: permission denied, open '/var/run/webpack-dev-server.sock'

WebSocket UNIX socket permission issue (Linux).

fix

Use a TCP port or configure socket permissions.

Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.

Invalid or deprecated option (e.g., 'contentBase').

fix

Check docs for correct option names.

Upgrade

Version history

3.1.1latest on npm

Audit

Dependencies

webpackrequiredPeer dependency; webpack-dev-server works as a plugin for webpack

Agent activity

16 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/webpack/webpack-dev-server ↗

packagehttps://www.npmjs.com/package/webpack-dev-server-speedy ↗

homepagehttps://webpack.js.org ↗