planning

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

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+import { BEGIN_DRAG, PUBLISH_DRAG_SOURCE, HOVER, END_DRAG, DROP, } from '../actions/dragDrop';
+import { ADD_SOURCE, ADD_TARGET, REMOVE_SOURCE, REMOVE_TARGET, } from '../actions/registry';
+import { areArraysEqual } from '../utils/equality';
+import { NONE, ALL } from '../utils/dirtiness';
+import { xor } from '../utils/js_utils';
+export function reduce(
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+_state = NONE, action) {
+    switch (action.type) {
+        case HOVER:
+            break;
+        case ADD_SOURCE:
+        case ADD_TARGET:
+        case REMOVE_TARGET:
+        case REMOVE_SOURCE:
+            return NONE;
+        case BEGIN_DRAG:
+        case PUBLISH_DRAG_SOURCE:
+        case END_DRAG:
+        case DROP:
+        default:
+            return ALL;
+    }
+    const { targetIds = [], prevTargetIds = [] } = action.payload;
+    const result = xor(targetIds, prevTargetIds);
+    const didChange = result.length > 0 || !areArraysEqual(targetIds, prevTargetIds);
+    if (!didChange) {
+        return NONE;
+    }
+    // Check the target ids at the innermost position. If they are valid, add them
+    // to the result
+    const prevInnermostTargetId = prevTargetIds[prevTargetIds.length - 1];
+    const innermostTargetId = targetIds[targetIds.length - 1];
+    if (prevInnermostTargetId !== innermostTargetId) {
+        if (prevInnermostTargetId) {
+            result.push(prevInnermostTargetId);
+        }
+        if (innermostTargetId) {
+            result.push(innermostTargetId);
+        }
+    }
+    return result;
+}