Allow --open option to specify the browser to use

bin/webpack-dev-server.js

@@ -86,7 +86,7 @@ yargs.options({
 		describe: "close when stdin ends"
 	},
 	"open": {
-		type: "boolean",
+		type: "string",
 		describe: "Open default browser"
 	},
 	"color": {
@@ -311,7 +311,7 @@ function processOptions(wpOpt) {
 		options.compress = true;
 
 	if(argv["open"])
-		options.open = true;
+		options.open = (argv["open"] === "") ? true : argv["open"];
 
 	// Kind of weird, but ensures prior behavior isn't broken in cases
 	// that wouldn't throw errors. E.g. both argv.port and options.port
@@ -421,6 +421,11 @@ function reportReadiness(uri, options) {
 	if(options.historyApiFallback)
 		console.log(`404s will fallback to ${colorInfo(useColor, options.historyApiFallback.index || "/index.html")}`);
 	if(options.open) {
+		open(uri, { app: options.open }).catch(function() {
+			console.log(`Unable to open browser '${options.open}'. If you are running in a headless environment, please do not use the open flag.`);
+		});
+	}
+	if(argv["open"] === "") {
 		open(uri).catch(function() {
 			console.log("Unable to open browser. If you are running in a headless environment, please do not use the open flag.");
 		});

lib/optionsSchema.json

@@ -182,7 +182,14 @@
     },
     "open": {
       "description": "Let the CLI open your browser with the URL.",
-      "type": "boolean"
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "boolean"
+        }
+      ]
     },
     "features": {
       "description": "The order of which the features will be triggered.",