webpack-dev-server not accepting promise

[crohde7707]

Noticed that when using webpack, you are able to return a Promise instead of an object as a valid parameter. I would assume that webpack-dev-server would be the same case, but it looks like it was an oversight. The code in question is as follows

webpack-dev-server/bin/webpack-dev-server.js

var wpOpt = require("webpack/bin/convert-argv")(optimist, argv, { outputFilename: "/bundle.js" });
var firstWpOpt = Array.isArray(wpOpt) ? wpOpt[0] : wpOpt;
var options = wpOpt.devServer || firstWpOpt.devServer || {};
...

webpack/bin/webpack.js

var options = require("./convert-argv")(yargs, argv);
...
function processOptions(options) {
    // process Promise
    if(typeof options.then === "function") {
        options.then(processOptions).catch(function(err) {
            console.error(err.stack || err);
            process.exit(); // eslint-disable-line
        });
        return;
    }

    var firstOptions = Array.isArray(options) ? options[0] : options;

    var outputOptions = Object.create(options.stats || firstOptions.stats || {});
    if(typeof outputOptions.context === "undefined")
        outputOptions.context = firstOptions.context;
...
}
processOptions(options);

Tried looking through the issues log for something like this, but couldn't find it, and it doesn't look like its fixed in the latest version