make isFirstStart, opened props of Server instance

lib/modules/webserver/server.js

@@ -10,14 +10,13 @@ require('http-shutdown').extend();
 require('ejs');
 const embark_building_placeholder = require('../code_generator/code_templates/embark-building-placeholder.html.ejs');
 
-let isFirstStart = true;
-let opened = false;
-
 class Server {
   constructor(options) {
     this.dist = options.dist || 'dist/';
     this.port = options.port || 8000;
     this.hostname = dockerHostSwap(options.host) || defaultHost;
+    this.isFirstStart = true;
+    this.opened = false;
   }
 
   start(callback) {
@@ -33,11 +32,11 @@ class Server {
       serve(req, res, finalhandler(req, res));
     }).withShutdown();
 
-    if (isFirstStart) {
+    if (this.isFirstStart) {
       const html = embark_building_placeholder({buildingMsg: __('Embark is building, please wait...')});
       fs.mkdirpSync(this.dist); // create dist/ folder if not already exists
       fs.writeFileSync(utils.joinPath(this.dist, 'index.html'), html);
-      isFirstStart = false;
+      this.isFirstStart = false;
     }
 
     this.server.listen(this.port, this.hostname, () => {
@@ -46,12 +45,12 @@ class Server {
         " " +
         ("http://" + canonicalHost(this.hostname) +
           ":" + this.port).bold.underline.green, this.port);
-      if (!opened) {
+      if (!this.opened) {
         // fail silently, e.g. in a docker container, by cacthing promise
         // rejection w/ a noop
         opn(`http://${canonicalHost(this.hostname)}:${this.port}`)
           .catch(function () {});
-        opened = true;
+        this.opened = true;
       }
     });
   }