planning

node_modules/dnd-core/lib/reducers/refCount.js

@@ -0,0 +1,13 @@
+import { ADD_SOURCE, ADD_TARGET, REMOVE_SOURCE, REMOVE_TARGET, } from '../actions/registry';
+export function reduce(state = 0, action) {
+    switch (action.type) {
+        case ADD_SOURCE:
+        case ADD_TARGET:
+            return state + 1;
+        case REMOVE_SOURCE:
+        case REMOVE_TARGET:
+            return state - 1;
+        default:
+            return state;
+    }
+}