Install typescript at root and use workspace version in VS Code

.vscode/settings.json

@@ -21,5 +21,5 @@
     "**/node_modules": true,
     "**/lib": true
   },
-  "typescript.tsdk": "node_modules\\typescript\\lib"
+  "typescript.tsdk": "node_modules/typescript/lib"
 }

package.json

@@ -38,6 +38,7 @@
     "lage": "1.8.1",
     "prettier": "2.7.1",
     "syncpack": "8.2.4",
+    "typescript": "4.1.3",
     "vuepress": "1.9.7",
     "vuepress-plugin-mermaidjs": "1.9.1"
   },