Transaction Changes

TransactionEvent was renamed to TransactionEventId, and event data extraction is now handled separately.

Quick Fix

src/events.rs

// Before
use miden_protocol::TransactionEvent;

// After
use miden_protocol::TransactionEventId;
use miden_protocol::TransactionEventData;

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TransactionEvent Renamed

TransactionEvent was renamed to TransactionEventId, and event data extraction is now handled separately.

src/events.rs

- use miden_protocol::TransactionEvent;
-
- fn handle_event(event: TransactionEvent) {
-     let data = event.data();
-     let event_type = event.event_type();
- }

+ use miden_protocol::TransactionEventId;
+ use miden_protocol::TransactionEventData;
+
+ fn handle_event(event_id: TransactionEventId, data: TransactionEventData) {
+     // Event ID and data are now separate
+     let event_type = event_id.event_type();
+     let payload = data.payload();
+ }

---

Event Processing

Event processing now uses separate ID and data objects:

src/processor.rs

- // Before: combined event object
- for event in transaction.events() {
-     match event {
-         TransactionEvent::NoteCreated(data) => { ... }
-         TransactionEvent::AccountUpdated(data) => { ... }
-     }
- }

+ // After: ID-based matching with separate data
+ for (event_id, event_data) in transaction.events() {
+     match event_id {
+         TransactionEventId::NoteCreated => {
+             let note_data = event_data.as_note_created()?;
+         }
+         TransactionEventId::AccountUpdated => {
+             let account_data = event_data.as_account_updated()?;
+         }
+     }
+ }

The separation of event ID and data allows for more efficient event filtering without deserializing data.

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Migration Steps

1. Replace all TransactionEvent imports with TransactionEventId
2. Add TransactionEventData imports where needed
3. Update event handling to use separate ID and data objects
4. Use typed accessor methods on TransactionEventData

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Common Errors

Error	Cause	Fix
TransactionEvent not found	Renamed	Use TransactionEventId
event.data() not found	Data separated	Use TransactionEventData