feat: migrate date fields from string to Firestore Timestamp

.gitignore

@@ -67,3 +67,6 @@ node_modules/
 
 # macOS system file
 .DS_store
+
+# IDE personal folder
+.idea

POSTINSTALL.md

@@ -67,7 +67,7 @@ getDoc(doc(db, "${param:REVENUECAT_CUSTOMERS_COLLECTION}", getAuth().currentUser
   .then((snapshot) => {
     if (snapshot.exists()) {
       snapshot.subscriptions
-        .filter(subscription => new Date(subscription.expires_date) >= new Date())
+        .filter(subscription => subscription.expires_date.toDate() >= new Date())
         .forEach(subscription => console.log(JSON.stringify(subscription)));
     }
   });

functions/src/index.ts

@@ -44,6 +44,28 @@ const getCustomersCollection = ({
   );
 };
 
+const isIso8601Date = (str: string): boolean => moment(str, moment.ISO_8601, true).isValid();
+
+
+const convertDatesToTimestamps = (obj: any): any => {
+  if (typeof obj === 'string' && isIso8601Date(obj)) {
+    return admin.firestore.Timestamp.fromDate(moment(obj).toDate());
+  }
+
+  if (Array.isArray(obj)) {
+    return obj.map(convertDatesToTimestamps);
+  }
+
+  if (obj !== null && typeof obj === 'object') {
+    return Object.entries(obj).reduce((acc, [key, value]) => {
+      acc[key] = convertDatesToTimestamps(value);
+      return acc;
+    }, {} as any);
+  }
+
+  return obj;
+};
+
 const writeToCollection = async ({
   firestore,
   customersCollectionConfig,
@@ -63,10 +85,11 @@ const writeToCollection = async ({
     userId,
   });
 
-  const payloadToWrite = {
+  // Recursively convert all date strings in the customerPayload to Timestamps
+  const payloadToWrite = convertDatesToTimestamps({
     ...customerPayload,
     aliases,
-  };
+  });
 
   await customersCollection.doc(userId).set(payloadToWrite, { merge: true });
   await customersCollection.doc(userId).update(payloadToWrite);

functions/src/types.ts

@@ -1,3 +1,5 @@
+import {firestore} from "firebase-admin";
+
 type EventType =
   | "INITIAL_PURCHASE"
   | "RENEWAL"
@@ -12,10 +14,10 @@ type EventType =
   | "EXPIRATION";
 
 interface Entitlement {
-  expires_date: string;
-  purchase_date: string;
+  expires_date: firestore.Timestamp;
+  purchase_date: firestore.Timestamp;
   product_identifier: string;
-  grace_period_expires_date: string;
+  grace_period_expires_date: firestore.Timestamp;
 }
 
 export interface CustomerInfo {