Webpack dev server

Sponsor webpack and get apparel from the official shop! All proceeds go to our open collective! See the development guide to get started, webpack dev server. This page describes the options that affect the behavior of webpack-dev-server short: dev-server.

See the development guide to get started. Migration guide from v4 to v5 can be found here. This set of options is picked up by webpack-dev-server and can be used to change its behavior in various ways. If you're using dev-server through the Node. See here for an example of how to use webpack-dev-server through the Node. A list of CLI options for serve is available here. See the related API documentation for webpack-dev-server.

Webpack dev server

If you've been following the guides, you should have a solid understanding of some of the webpack basics. Before we continue, let's look into setting up a development environment to make our lives a little easier. Let's start by setting mode to 'development' and title to 'Development'. When webpack bundles your source code, it can become difficult to track down errors and warnings to their original location. For example, if you bundle three source files a. This isn't always helpful as you probably want to know exactly which source file the error came from. In order to make it easier to track down errors and warnings, JavaScript offers source maps , which map your compiled code back to your original source code. If an error originates from b. There are a lot of different options available when it comes to source maps. Be sure to check them out so you can configure them to your needs. For this guide, let's use the inline-source-map option, which is good for illustrative purposes though not for production :. Now let's make sure we have something to debug, so let's create an error in our print. Now open the resulting index. Click the button and look in your console where the error is displayed.

For example, to define custom handlers for some paths: webpack. Stats stats stats.

It allows all kinds of modules to be updated at runtime without the need for a full refresh. This page focuses on implementation while the concepts page gives more details on how it works and why it's useful. This feature is great for productivity. All we need to do is update our webpack-dev-server configuration, and use webpack's built-in HMR plugin. We'll also remove the entry point for print. Now let's update the index.

In this guide, we'll dive into some of the best practices and utilities for building a production site or application. The goals of development and production builds differ greatly. In development , we want strong source mapping and a localhost server with live reloading or hot module replacement. In production , our goals shift to a focus on minified bundles, lighter weight source maps, and optimized assets to improve load time. With this logical separation at hand, we typically recommend writing separate webpack configurations for each environment. While we will separate the production and development specific bits out, note that we'll still maintain a "common" configuration to keep things DRY. In order to merge these configurations together, we'll use a utility called webpack-merge.

Webpack dev server

Use webpack with a development server that provides live reloading. This should be used for development only. It uses webpack-dev-middleware under the hood, which provides fast in-memory access to the webpack assets. Note: While you can install and run webpack-dev-server globally, we recommend installing it locally. The easiest way to use it is with the webpack CLI. In the directory where your webpack. Detailed documentation for above options is available on this link. NPM package. Simply define a script as such:.

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If you're using dev-server through the Node. Now in your terminal run npm run server , it should give you an output similar to this:. Tell the server at which URL to serve static. To show only errors in your bundle: webpack. When true it will try to reconnect unlimited times. For this guide, let's use the inline-source-map option, which is good for illustrative purposes though not for production : webpack. By default in lazy mode , every request results in a new compilation. Change the style on body to background: red; and you should immediately see the page's background color change without a full refresh. JetBrains IDEs e. To create a custom server implementation, create a class that extends BaseServer. It is useful in some cases like using name-based virtual hosted sites. Return a path to serve from, instead of continuing to proxy the request.

See the development guide to get started.

If you want your server to be accessible externally, specify it like this:. The webpack-dev-server comes with many configurable options. Now let's update the index. Externals externals string array object function regex Combining syntaxes. For example:. It quickly becomes a hassle to manually run npm run build every time you want to compile your code. Development If you've been following the guides, you should have a solid understanding of some of the webpack basics. Start changing the console. Instead, pass them as a second parameter upon creation. If this is too heavy on the file system, you can change this to an integer to set the interval in milliseconds. We welcome your contributions!