Note: The webpack-dev-middleware is for advanced users. See webpack-dev-server for a ready-to-use solution.
The webpack-dev-middleware is a small middleware for a connect-based middleware stack. It uses webpack to compile assets in-memory and serve them. When a compilation is running every request to the served webpack assets is blocked until we have a stable bundle.
You can use it in two modes:
- watch mode (default): The compiler recompiles on file change.
- lazy mode: The compiler compiles on every request to the entry point.
API
var webpackDevMiddleware = require("webpack-dev-middleware"); var webpack = require("webpack"); var compiler = webpack({ // configuration output: { path: '/' } }); app.use(webpackDevMiddleware(compiler, { // options }));
options
noInfo
Display no info to console (only warnings and errors)
Default: false
quiet
Display nothing to the console
Default: false
lazy
Switch into lazy mode.
Default: false
filename
In lazy mode: Switch request should trigger the compilation.
In most cases this equals the webpack configuration option output.filename
.
watchOptions.aggregateTimeout
Delay the rebuilt after the first change. Value is a time in ms.
Default: 300
watchOptions.poll
true
: use polling
number: use polling with specified interval
Default: undefined
publicPath
(required)
The path where to bind the middleware to the server.
In most cases this equals the webpack configuration option output.publicPath
.
headers
Add custom headers. i. e. { "X-Custom-Header": "yes" }
stats
Output options for the stats. See node.js API.
middleware.invalidate()
Manually invalidate the compilation. Useful if stuff of the compiler has changed.
middleware.fileSystem
A readable (in-memory) filesystem that can access the compiled data.
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