fix ts errors

src/lib/ical-helpers.ts

@@ -0,0 +1,29 @@
+import ICAL from "ical.js";
+
+export function isRecur(val: unknown): val is ICAL.Recur {
+	return typeof val === "object" && val instanceof ICAL.Recur;
+}
+
+export function isTime(val: unknown): val is ICAL.Time {
+	return typeof val === "object" && val instanceof ICAL.Time;
+}
+
+// export function isGeo(val: unknown): val is ICAL.Geo {
+// 	return typeof val === "object" && val instanceof ICAL.Geo;
+// }
+
+export function isUtcOffset(val: unknown): val is ICAL.UtcOffset {
+	return typeof val === "object" && val instanceof ICAL.UtcOffset;
+}
+
+export function isBinary(val: unknown): val is ICAL.Binary {
+	return typeof val === "object" && val instanceof ICAL.Binary;
+}
+
+export function isDuration(val: unknown): val is ICAL.Duration {
+	return typeof val === "object" && val instanceof ICAL.Duration;
+}
+
+export function isPeriod(val: unknown): val is ICAL.Period {
+	return typeof val === "object" && val instanceof ICAL.Period;
+}