Webpack dev server

It allows all kinds of modules to be updated at runtime without the need for a full refresh.

Sponsor webpack and get apparel from the official shop! All proceeds go to our open collective! See the development guide to get started. This page describes the options that affect the behavior of webpack-dev-server short: dev-server. This set of options is picked up by webpack-dev-server and can be used to change its behavior in various ways.

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.

License MIT.

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.

See the "How to Develop? This page describes the options that affect the behavior of webpack-dev-server short: dev-server. 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. Provides the ability to execute custom middleware after all other middleware internally within the server. To use this option with the CLI pass the --allowed-hosts option a comma-delimited string.

Webpack dev server

See the "How to Develop? This page describes the options that affect the behavior of webpack-dev-server short: dev-server. 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. Provides the ability to execute custom middleware after all other middleware internally within the server. To use this option with the CLI pass the --allowed-hosts option a comma-delimited string. Provides the ability to execute custom middleware prior to all other middleware internally within the server. This could be used to define custom handlers, for example:.

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If one of these files is updated, the code will be recompiled so you don't have to run the full build manually. Let's add a script to easily run the dev server as well: package. See the documentation for more use cases and options. While webpack-dev-server transpiles the client browser scripts to an ES5 state, the project only officially supports the last two versions of major browsers. Configuration Use a different configuration file Set up a new webpack project. Package exports General syntax Alternatives Conditional syntax Abbreviation Notes about ordering Support Conditions Reference syntax Optimizations Target environment Conditions: Preprocessor and runtimes Conditions: Custom Common patterns Target environment independent packages Providing devtools or production optimizations Providing different versions depending on target environment Combining patterns Guidelines. If webpack or webpack-dev-server are launched with the --hot option, this plugin will be added automatically, so you may not need to add this to your webpack. The error should say something like this:. Disable devServer. This is used in webpack-dev-server internally, however it's available as a separate package to allow more custom setups if desired. Be aware that when exporting multiple configurations only the devServer options for the first configuration will be taken into account and used for all the configurations in the array. Allows dev-server to register custom mime types. The easiest way to use it is with the webpack CLI. The current default mode is 'ws'. Return false to produce a error for the request.

See the development guide to get started. Migration guide from v3 to v4 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.

Module module. Tells dev-server to open the browser after server had been started. See the documentation for more use cases and options. This allows to specify how browser or other client communicates with the devServer. To disable contentBase set it to false. To enable root proxying, the devMiddleware. Instead, pass them as a second parameter upon creation. With a backend on localhost , you can use this to enable proxying: webpack. Disable devServer. License MIT. If you've been following the guides, you should have a solid understanding of some of the webpack basics. NPM package. Configuration Use different config file Options. Using path to CustomServer.