Update the node dependencies

Some APIs were broken (webpack-copy plugin and one xterm API removed)

.travis.yml

@@ -4,7 +4,7 @@ go:
   - 1.12.x
 
 node_js:
-  - 12.4.0
+  - 12.18.4
 
 # make frontend all won't work. The frontend assets have to be already built at the time of
 # evaluating the Makefile first time, so for now I do it in two turns.

frontend/package.json

@@ -10,13 +10,13 @@
   "author": "elisescu",
   "license": "elisescu",
   "dependencies": {
-    "copy-webpack-plugin": "4.5.1",
-    "css-loader": "^3.0.0",
+    "copy-webpack-plugin": "^6.0.0",
+    "css-loader": "^3.6.0",
     "style-loader": "^0.23.1",
-    "ts-loader": "^6.0.2",
-    "typescript": "^3.5.2",
-    "webpack": "^4.34.0",
-    "webpack-cli": "^3.3.4",
-    "xterm": "3.14.4"
+    "ts-loader": "^6.2.2",
+    "typescript": "^3.9.7",
+    "webpack": "^4.44.2",
+    "webpack-cli": "^3.3.12",
+    "xterm": "^4.9.0"
   }
 }

frontend/tty-receiver/main.ts

@@ -1,4 +1,4 @@
-import 'xterm/dist/xterm.css';
+import 'xterm/css/xterm.css';
 import './main.css';
 
 import { Terminal } from 'xterm';

frontend/tty-receiver/tty-receiver.ts

@@ -60,8 +60,7 @@ class TTYReceiver {
             }
         }
 
-            // TODO: .on() is deprecated. Should be replaced.
-        this.xterminal.on('data', function (data) {
+        this.xterminal.onData(function (data:string) {
             let writeMessage = {
                 Type: "Write",
                 Data: base64.encode(JSON.stringify({ Size: data.length, Data: base64.encode(data)})),

frontend/webpack.config.js

@@ -33,12 +33,11 @@ let mainConfig  = {
       extensions: [".ts", ".tsx", ".js"],
     },
     plugins: [
-        new copyWebpackPlugin([
-            'static',
-            'templates',
-        ], {
-            debug: 'info',
-        }),
+      new copyWebpackPlugin({
+        patterns: [
+          {from: 'static', },
+          {from:   'templates',},
+        ]}),
     ],
 };