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frontend/node_modules/antd/es/transfer/hooks/useSelection.js

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+import _toConsumableArray from "@babel/runtime/helpers/esm/toConsumableArray";
+import * as React from 'react';
+import { useEvent, useMergedState } from 'rc-util';
+const EMPTY_KEYS = [];
+function filterKeys(keys, dataKeys) {
+  const filteredKeys = keys.filter(key => dataKeys.has(key));
+  return keys.length === filteredKeys.length ? keys : filteredKeys;
+}
+function flattenKeys(keys) {
+  return Array.from(keys).join(';');
+}
+function useSelection(leftDataSource, rightDataSource, selectedKeys) {
+  // Prepare `dataSource` keys
+  const [leftKeys, rightKeys] = React.useMemo(() => [new Set(leftDataSource.map(src => src === null || src === void 0 ? void 0 : src.key)), new Set(rightDataSource.map(src => src === null || src === void 0 ? void 0 : src.key))], [leftDataSource, rightDataSource]);
+  // Selected Keys
+  const [mergedSelectedKeys, setMergedSelectedKeys] = useMergedState(EMPTY_KEYS, {
+    value: selectedKeys
+  });
+  const sourceSelectedKeys = React.useMemo(() => filterKeys(mergedSelectedKeys, leftKeys), [mergedSelectedKeys, leftKeys]);
+  const targetSelectedKeys = React.useMemo(() => filterKeys(mergedSelectedKeys, rightKeys), [mergedSelectedKeys, rightKeys]);
+  // // Reset when data changed
+  React.useEffect(() => {
+    setMergedSelectedKeys([].concat(_toConsumableArray(filterKeys(mergedSelectedKeys, leftKeys)), _toConsumableArray(filterKeys(mergedSelectedKeys, rightKeys))));
+  }, [flattenKeys(leftKeys), flattenKeys(rightKeys)]);
+  // Update keys
+  const setSourceSelectedKeys = useEvent(nextSrcKeys => {
+    setMergedSelectedKeys([].concat(_toConsumableArray(nextSrcKeys), _toConsumableArray(targetSelectedKeys)));
+  });
+  const setTargetSelectedKeys = useEvent(nextTargetKeys => {
+    setMergedSelectedKeys([].concat(_toConsumableArray(sourceSelectedKeys), _toConsumableArray(nextTargetKeys)));
+  });
+  return [
+  // Keys
+  sourceSelectedKeys, targetSelectedKeys,
+  // Updater
+  setSourceSelectedKeys, setTargetSelectedKeys];
+}
+export default useSelection;