Add back typescript

package-lock.json

@@ -3847,6 +3847,12 @@
       "integrity": "sha512-SwyN188QGNA2iFS5mdWYTGzohKqJ1PWAXVmGolKnVc2NnpX234FEPF2nUvEg+O9jjwAu7ZSVZ5UrZri0raJOjQ==",
       "dev": true
     },
+    "typescript": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.1.3.tgz",
+      "integrity": "sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==",
+      "dev": true
+    },
     "uglify-js": {
       "version": "3.10.4",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.10.4.tgz",

package.json

@@ -30,6 +30,7 @@
     "monaco-typescript": "4.1.1",
     "rimraf": "^3.0.2",
     "typedoc": "^0.19.1",
+    "typescript": "4.1.3",
     "uncss": "^0.17.3",
     "vinyl": "^2.2.1",
     "yaserver": "^0.3.0"