config.devServer.hot doesn't work as expected

[skozin]

Documentation states that config.devServer can be used to configure webpack-dev-server, and that webpack-dev-server accepts the hot option. However, this webpack.config.js doesn't work:

module.exports = {
  entry: [ 'webpack/hot/dev-server', './src/main' ],
  devServer: {
    hot: true
  }
}

Expected result: Hot Replacement Mode is enabled and working.

Actual result: the Uncaught Error: [HMR] Hot Module Replacement is disabled message is printed to the browser console.

The cause is probably this check in webpack/convert-argv.js that adds HotModuleReplacementPlugin only when --hot command-line option is present.

[skozin]

Ah, now I see this line in the comments:

// Note: this does _not_ add the `HotModuleReplacementPlugin` like the CLI option does.

What's the reason for this behaviour?

[MrOrz]

Probably because API has no access to the webpack config:

#106 (comment)

[skozin]

@MrOrz, thanks! I'm closing this issue in favor of that one you linked.