create report-transactions map to improve performance

src/libs/TransactionUtils/index.ts

@@ -68,6 +68,7 @@ type BuildOptimisticTransactionParams = {
 };
 
 let allTransactions: OnyxCollection<Transaction> = {};
+let transactionsByReport: Record<string, Set<string>> = {};
 Onyx.connect({
     key: ONYXKEYS.COLLECTION.TRANSACTION,
     waitForCollectionCallback: true,
@@ -76,6 +77,18 @@ Onyx.connect({
             return;
         }
         allTransactions = Object.fromEntries(Object.entries(value).filter(([, transaction]) => !!transaction));
+
+        transactionsByReport = {};
+        Object.entries(allTransactions).forEach(([transactionID, transaction]) => {
+            if (!transaction?.reportID) {
+                return;
+            }
+
+            if (!transactionsByReport[transaction.reportID]) {
+                transactionsByReport[transaction.reportID] = new Set();
+            }
+            transactionsByReport[transaction.reportID].add(transactionID);
+        });
     },
 });
 
@@ -818,10 +831,22 @@ function hasRoute(transaction: OnyxEntry<Transaction>, isDistanceRequestType?: b
 }
 
 function getAllReportTransactions(reportID?: string, transactions?: OnyxCollection<Transaction>): Transaction[] {
-    const reportTransactions: Transaction[] = Object.values(transactions ?? allTransactions ?? {}).filter(
-        (transaction): transaction is Transaction => !!transaction && transaction.reportID === reportID,
-    );
-    return reportTransactions;
+    if (!reportID) {
+        return [];
+    }
+
+    if (transactions) {
+        return Object.values(transactions).filter((transaction): transaction is Transaction => !!transaction && transaction.reportID === reportID);
+    }
+
+    const transactionIDs = transactionsByReport[reportID];
+    if (!transactionIDs) {
+        return [];
+    }
+
+    return Array.from(transactionIDs)
+        .map((transactionID) => allTransactions?.[transactionID])
+        .filter((transaction): transaction is Transaction => !!transaction);
 }
 
 function waypointHasValidAddress(waypoint: RecentWaypoint | Waypoint): boolean {