参考官方文档:
https://webpack.github.io/docs/usage-with-gulp.html

gulp.task("webpack-dev-server", function(callback) {
    // Start a webpack-dev-server
    var compiler = webpack({
        // configuration
    });

    new WebpackDevServer(compiler, {
        // server and middleware options
    }).listen(8080, "localhost", function(err) {
        if(err) throw new gutil.PluginError("webpack-dev-server", err);
        // Server listening
        gutil.log("[webpack-dev-server]", "http://localhost:8080/webpack-dev-server/index.html");

        // keep the server alive or continue?
        // callback();
    });
});