remove redundant connectionLookup entries

packages/react/src/hooks/useHandleConnections.ts

@@ -32,7 +32,7 @@ type useHandleConnectionsParams = {
  */
 export function useHandleConnections({
   type,
-  id = null,
+  id,
   nodeId,
   onConnect,
   onDisconnect,
@@ -47,7 +47,7 @@ export function useHandleConnections({
   const prevConnections = useRef<Map<string, HandleConnection> | null>(null);
 
   const connections = useStore(
-    (state) => state.connectionLookup.get(`${currentNodeId}-${type}-${id}`),
+    (state) => state.connectionLookup.get(`${currentNodeId}-${type}${id ? `-${id}` : ''}`),
     areConnectionMapsEqual
   );
 

packages/react/src/hooks/useReactFlow.ts

@@ -239,7 +239,14 @@ export function useReactFlow<NodeType extends Node = Node, EdgeType extends Edge
         Array.from(
           store
             .getState()
-            .connectionLookup.get(`${nodeId}-${type}-${id ?? null}`)
+            .connectionLookup.get(`${nodeId}-${type}${id ? `-${id}` : ''}`)
+            ?.values() ?? []
+        ),
+      getNodeConnections: ({ type, handleId, nodeId }) =>
+        Array.from(
+          store
+            .getState()
+            .connectionLookup.get(`${nodeId}${type ? (handleId ? `-${type}-${handleId}` : `-${type}`) : ''}`)
             ?.values() ?? []
         ),
     };