make codam-web-greeter compatible with node v12

for out-of-the-box support on Ubuntu 22 LTS

Author: FreekBes

package-lock.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "nody-greeter-types": "^1.1.0",
     "ts-loader": "^9.5.0",
-    "typescript": "^5.2.2",
+    "typescript": "^4.9.5",
     "webpack": "^5.89.0",
     "webpack-cli": "^5.1.4"
   }

package.json

@@ -26,6 +26,6 @@
   },
   "devDependencies": {
     "@types/express": "^4.17.20",
-    "typescript": "^5.2.2"
+    "typescript": "^4.9.5"
   }
 }

server/package-lock.json

@@ -51,6 +51,7 @@ const filterExamOrEventOnDate = function(items: Exam42[] | Event42[]) {
 	// Delete events that are over the limit specified in the global variable
 	const currentDate = new Date();
 	const maxFetchDate = new Date(currentDate.getTime() + 1000 * 60 * 60 * 24 * FETCH_EVENTS_UPCOMING_DAYS);
+	// @ts-ignore (This expression is not callable -> each member of union type has signatures, but none of those signatures are compatible with each other)
 	const filteredItems = items.filter((item: Exam42 | Event42) => {
 		const eventDate = new Date(item.begin_at);
 		return eventDate.getTime() <= maxFetchDate.getTime();