Server callback is barely useful

[StephanBijzitter]

Do you want to request a feature or report a bug?
I am not sure whether this is by design (in which case I want to request a change), or a bug.

What is the current behavior?
The callback for listen is called immediately after the server is reachable on the specified port.

If the current behavior is a bug, please provide the steps to reproduce.

const webpack = require('webpack');
const config = require('../webpack.config.server');
const WebpackDevServer = require('webpack-dev-server');

const compiler = webpack(config);
const server = new WebpackDevServer(compiler, config.devServer);

server.listen(config.devServer.port, () => {

});

What is the expected behavior?
I expected the callback to be called after compilation had finished (and all javascript bundles were created). This is because my callback is a testing suite which needs the server online (currently the callback satisfies this), but also needs the files to be already-created.

If this is a feature request, what is motivation or use case for changing the behavior?
I want to request the option to be able to run a function after the initial compiling finishes, so that I can run my test suites.

Please mention your webpack and Operating System version.
webpack ^2, webpack-dev-server ^2, ubuntu 14.04

[SpaceK33z]

A callback that fires when compilation is finished is available as compiler.plugin('done', cb).

I happen to have made a test suite runner like you have too, this is some code out of mine:

compiler.plugin('done', (stats) => {
    stats = stats.toJson();

    if (stats.errors && stats.errors.length > 0) {
        // show errors
        return;
    }
    // compilation success
});

The .listen callback is by design, there are many cases where you immediately want to do something after the server has started, like show the URL.

[StephanBijzitter]

Ha, well I'll be damned.

[th3fallen]

is there a way to catch this error...

      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRNOTAVAIL 10.211.55.5:3000

happens when the host domain doesnt exist on the machine, i want to log an error telling the devs to add a hostfile entry.