updated webpack-dev-server to accept a custom ssl certificate (#19996)

types/webpack-dev-server/index.d.ts

@@ -8,12 +8,13 @@ import * as webpack from 'webpack';
 import * as core from 'express-serve-static-core';
 import * as serveStatic from 'serve-static';
 import * as http from 'http';
+import * as spdy from 'spdy';
 
 declare namespace WebpackDevServer {
     interface Configuration {
         contentBase?: string;
         hot?: boolean;
-        https?: boolean;
+        https?: boolean | spdy.ServerOptions;
         historyApiFallback?: boolean;
         compress?: boolean;
         proxy?: any;

types/webpack-dev-server/webpack-dev-server-tests.ts

@@ -72,3 +72,10 @@ const config: WebpackDevServer.Configuration = {
 // API example
 server = new WebpackDevServer(compiler, config);
 server.listen(8080, "localhost", () => {});
+
+// HTTPS example
+server = new WebpackDevServer(compiler, {
+    publicPath: "/assets/",
+    https: true
+});
+server.listen(8080, "localhost", () => {});