Exposed transaction dataset for useChange and added didChange to transaction dataset

packages/react/src/methods/change/types.ts

@@ -8,6 +8,7 @@ export type useChangeReturn<Type, Plugins extends ConnectedPlugin[]> = [
   Type,
   useChangeSetData<Type, Plugins>,
   useChangeCommitData<Plugins>,
+  transactionDataset: ConnectedLdoTransactionDataset<Plugins>,
 ];
 
 type BaseOtherType = LdoBase | LdSet<LdoBase>;

packages/react/src/methods/change/useChangeMatchObject.ts

@@ -59,8 +59,8 @@ export function createUseChangeMatchObject<Plugins extends ConnectedPlugin[]>(
     );
 
     return useMemo(
-      () => [ldObject, setData, commitData],
-      [ldObject, setData, commitData],
+      () => [ldObject, setData, commitData, transactionDataset],
+      [ldObject, setData, commitData, transactionDataset],
     );
   };
 }

packages/react/src/methods/change/useChangeMatchSubject.ts

@@ -61,8 +61,8 @@ export function createUseChangeMatchSubject<Plugins extends ConnectedPlugin[]>(
     );
 
     return useMemo(
-      () => [ldObject, setData, commitData],
-      [ldObject, setData, commitData],
+      () => [ldObject, setData, commitData, transactionDataset],
+      [ldObject, setData, commitData, transactionDataset],
     );
   };
 }

packages/react/src/methods/change/useChangeSubject.ts

@@ -76,8 +76,8 @@ export function createUseChangeSubject<Plugins extends ConnectedPlugin[]>(
     );
 
     return useMemo(
-      () => [ldObject, setData, commitData],
-      [ldObject, setData, commitData],
+      () => [ldObject, setData, commitData, transactionDataset],
+      [ldObject, setData, commitData, transactionDataset],
     );
   };
 }

packages/subscribable-dataset/src/TransactionDataset.ts

@@ -287,4 +287,17 @@ export class TransactionDataset<InAndOutQuad extends BaseQuad = BaseQuad>
   public getChanges(): DatasetChanges<InAndOutQuad> {
     return this.datasetChanges;
   }
+
+  /**
+   * Returns true if the transaction is holding changes that have yet to be committed.
+   * Returns false if no changes have yet been made to it.
+   */
+  public hasChanges(): boolean {
+    return (
+      ((this.datasetChanges.added && this.datasetChanges.added.size > 0) ||
+        (this.datasetChanges.removed &&
+          this.datasetChanges.removed.size > 0)) ??
+      false
+    );
+  }
 }

packages/subscribable-dataset/src/types.ts

@@ -166,4 +166,5 @@ export interface ITransactionDataset<InAndOutQuad extends BaseQuad = BaseQuad>
   rollback(): void;
   commit(): void;
   getChanges(): DatasetChanges<InAndOutQuad>;
+  hasChanges(): boolean;
 }