Update to new Knub 30 beta. Code clean-up.

backend/package-lock.json

@@ -1010,6 +1010,7 @@
       "requires": {
         "anymatch": "~3.1.1",
         "braces": "~3.0.2",
+        "fsevents": "~2.1.2",
         "glob-parent": "~5.1.0",
         "is-binary-path": "~2.1.0",
         "is-glob": "~4.0.1",
@@ -1841,6 +1842,13 @@
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
+    "fsevents": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.1.3.tgz",
+      "integrity": "sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==",
+      "dev": true,
+      "optional": true
+    },
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
@@ -2364,19 +2372,12 @@
       }
     },
     "knub": {
-      "version": "30.0.0-beta.21",
-      "resolved": "https://registry.npmjs.org/knub/-/knub-30.0.0-beta.21.tgz",
-      "integrity": "sha512-BkMLgqqw7AroarZpsQ0wK93Yk2cFBRJa8GmFPYogiXEDTA/47oQ+A21SpbRCfZ2sCxFdjdZPUZIPqgjG38H7YQ==",
+      "version": "30.0.0-beta.23",
+      "resolved": "https://registry.npmjs.org/knub/-/knub-30.0.0-beta.23.tgz",
+      "integrity": "sha512-kBlQQAc6IPqyVA832wR567qUdE2EZIJUGTgUQE8NGmx7MxQrqZ7yvK1+Mkzh3HlNBgnrAgMorRimQHeO+xEXxw==",
       "requires": {
         "knub-command-manager": "^8.1.2",
         "ts-essentials": "^6.0.7"
-      },
-      "dependencies": {
-        "escape-string-regexp": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-2.0.0.tgz",
-          "integrity": "sha512-UpzcLCXolUWcNu5HtVMHYdXJjArjsF9C0aNnquZYY4uW/Vu0miy5YoWvbV345HauVvcAUnpRuhMMcqTcGOY2+w=="
-        }
       }
     },
     "knub-command-manager": {