The webpack-dev-middleware, but for isomorphic applications.
$ npm install webpack-isomorphic-dev-middleware --save-dev
The current version works with webpack v2, v3 and v4.
You might get a peer dependency warning when using webpack v2 or v3 but you may ignore it.
Building applications powered by webpack with server-side rendering (isomorphic/universal apps) is hard.
When making a production build, you must compile both the client and server. When developing, we want to rebuild the client & server and bring in the new compiled code without restarting/reloading the application. This is complex, especially setting up the development server.
To make your development workflow easier to setup,
webpack-isomorphic-dev-middleware offers an express middleware that:
- Looks for code changes in both the client and the server and automatically compiles them
- Optimizes compilation by using in-memory filesystem
- Delays responses until the aggregated compiler finishes
isomorphicto res.locals, which includes the webpack stats and the methods exported in your server file
- Offers beautiful compilation reporting into your terminal
- Receive status through OS notifications
- Shows compilation errors in the browser on refresh, similar to the ones you get on the terminal
const express = ;const webpack = ;const webpackIsomorphicDevMiddleware = ;const webpackHotMiddleware = ;const clientCompiler = ;const serverCompiler = ;const app = ;// Serve any static files from the public folderapp;// Add the middleware that will wait for both client and server compilations to be readyapp;// You may also add webpack-hot-middleware to provide hot module replacement to the clientapp;// Catch all route to attempt to render our isomorphic appapp;
The middleware function is flexible and supports various signatures:
- Two separate webpack compilers
const clientCompiler = ;const serverCompiler = ;app;
- A webpack multi-compiler where the first and second indexes belong to the client and server respectively, see https://webpack.js.org/api/node
const compiler =;app;
- A webpack-isomorphic-compiler that simplifies compiling isomorphic apps
const isomorphicCompiler =;app;
|memoryFs||Either disable or enable in-memory filesystem (disabling decreases performance)||boolean||true|
|watchOptions||Options to pass to webpack's watch||object|
|watchDelay||Delay calling webpack's watch for the given milliseconds||number||0|
|notify||Report build status through OS notifications||boolean/object||false|
|headers||Headers to be sent when serving compiled files||object||
|findServerAssetName||Finds the server asset to require from the Webpack stats||function||first js asset from the first entrypoint|
// Finds the asset with the `server` word in its namestatsassets;
$ npm test
$ npm test -- --watch during development