add util.ts for sharing common functions between frontend and backend

package-lock.json

@@ -600,6 +600,16 @@
         "@types/node": "*"
       }
     },
+    "@types/bootstrap": {
+      "version": "5.0.17",
+      "resolved": "https://registry.npmjs.org/@types/bootstrap/-/bootstrap-5.0.17.tgz",
+      "integrity": "sha512-uQQQ3p+zw10VjZLvtCuKWI6QgVCYEnK/yHnno3gyEhikfQdiZexS2XPxjWRboGmX135o470GkmCta9eAgQMVLQ==",
+      "dev": true,
+      "requires": {
+        "@popperjs/core": "^2.9.2",
+        "@types/jquery": "*"
+      }
+    },
     "@types/component-emitter": {
       "version": "1.2.10",
       "resolved": "https://registry.npmjs.org/@types/component-emitter/-/component-emitter-1.2.10.tgz",
@@ -676,6 +686,15 @@
       "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-1.8.1.tgz",
       "integrity": "sha512-e+2rjEwK6KDaNOm5Aa9wNGgyS9oSZU/4pfSMMPYNOfjvFI0WVXm29+ITRFr6aKDvvKo7uU1jV68MW4ScsfDi7Q=="
     },
+    "@types/jquery": {
+      "version": "3.5.6",
+      "resolved": "https://registry.npmjs.org/@types/jquery/-/jquery-3.5.6.tgz",
+      "integrity": "sha512-SmgCQRzGPId4MZQKDj9Hqc6kSXFNWZFHpELkyK8AQhf8Zr6HKfCzFv9ZC1Fv3FyQttJZOlap3qYb12h61iZAIg==",
+      "dev": true,
+      "requires": {
+        "@types/sizzle": "*"
+      }
+    },
     "@types/keygrip": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/@types/keygrip/-/keygrip-1.0.2.tgz",
@@ -760,6 +779,12 @@
         "@types/node": "*"
       }
     },
+    "@types/sizzle": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/@types/sizzle/-/sizzle-2.3.3.tgz",
+      "integrity": "sha512-JYM8x9EGF163bEyhdJBpR2QX1R5naCJHC8ucJylJ3w9/CVBaskdQ8WqBf8MmQrd1kRvp/a4TS8HJ+bxzR7ZJYQ==",
+      "dev": true
+    },
     "@types/unist": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/@types/unist/-/unist-2.0.6.tgz",
@@ -6673,6 +6698,12 @@
         "is-typedarray": "^1.0.0"
       }
     },
+    "typescript": {
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
+      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
+      "dev": true
+    },
     "unc-path-regex": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",