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video-gen-admin/node_modules/@rc-component/tree/es/utils/diffUtil.js

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+export function findExpandedKeys(prev = [], next = []) {
+  const prevLen = prev.length;
+  const nextLen = next.length;
+  if (Math.abs(prevLen - nextLen) !== 1) {
+    return {
+      add: false,
+      key: null
+    };
+  }
+  function find(shorter, longer) {
+    const cache = new Map();
+    shorter.forEach(key => {
+      cache.set(key, true);
+    });
+    const keys = longer.filter(key => !cache.has(key));
+    return keys.length === 1 ? keys[0] : null;
+  }
+  if (prevLen < nextLen) {
+    return {
+      add: true,
+      key: find(prev, next)
+    };
+  }
+  return {
+    add: false,
+    key: find(next, prev)
+  };
+}
+export function getExpandRange(shorter, longer, key) {
+  const shorterStartIndex = shorter.findIndex(data => data.key === key);
+  const shorterEndNode = shorter[shorterStartIndex + 1];
+  const longerStartIndex = longer.findIndex(data => data.key === key);
+  if (shorterEndNode) {
+    const longerEndIndex = longer.findIndex(data => data.key === shorterEndNode.key);
+    return longer.slice(longerStartIndex + 1, longerEndIndex);
+  }
+  return longer.slice(longerStartIndex + 1);
+}