webpack-serve-overlay

0.3.0 verified Sat Apr 25 auth: no javascript

A rudimentary error overlay for webpack-serve, mimicking the overlay from webpack-dev-server. Version 0.3.0 is the latest stable release, with no recent updates. The package requires webpack-serve and provides a minimal, quick way to display compilation errors in the browser during development. It uses a WebSocket connection similar to webpack-hot-client and requires no extra configuration. Conditional require with environment check is recommended to avoid inclusion in production builds.

Common errors

error Error: Cannot find module 'webpack-serve-overlay' ↓

cause Package not installed or missing from node_modules.

fix

Run npm install webpack-serve-overlay

error Uncaught ReferenceError: require is not defined ↓

cause Using require() in an ESM environment without bundler support.

fix

Ensure this code is bundled by webpack or use import with appropriate configuration.

error Overlay not showing even in development mode ↓

cause Missing or incorrect WebSocket URL; or process.env.NODE_ENV not set.

fix

Set NODE_ENV=development and/or WEBPACK_SERVE_OVERLAY_WS_URL environment variable.

Warnings

gotcha Requires webpack-serve as a peer dependency to function. ↓

fix Ensure webpack-serve is installed alongside.

gotcha Overlay may not appear if WebSocket URL cannot be automatically determined; set WEBPACK_SERVE_OVERLAY_WS_URL environment variable. ↓

fix Specify WEBPACK_SERVE_OVERLAY_WS_URL=http://localhost:8080/ (or appropriate URL).

gotcha Package uses CommonJS require; ES module imports may fail or cause side-effect issues. ↓

fix Use require() instead of import for this package.

Install

npm install webpack-serve-overlay

yarn add webpack-serve-overlay

pnpm add webpack-serve-overlay

Imports

webpack-serve-overlay
wrong
```
import 'webpack-serve-overlay'
```
correct
```
require('webpack-serve-overlay')
```
CommonJS require only; ES import may not work due to missing default export.

default

wrong

import webpackServeOverlay from 'webpack-serve-overlay'

correct

require('webpack-serve-overlay')

Package has no default export; use require for side effects.

global side effect

wrong

require('webpack-serve-overlay') without env check

correct

if (process.env.NODE_ENV === 'development') { require('webpack-serve-overlay'); }

Always include inside development-only conditional to avoid inclusion in production.

Quickstart

Basic setup to show error overlay in development mode using conditional require.

// Install: npm install webpack-serve-overlay
// In your entry file (e.g., index.jsx):
if (process.env.NODE_ENV === 'development') {
    require('webpack-serve-overlay');
}