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frontend/node_modules/rc-tree/es/useUnmount.js

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+import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
+import * as React from 'react';
+import useLayoutEffect from "rc-util/es/hooks/useLayoutEffect";
+
+/**
+ * Trigger only when component unmount
+ */
+function useUnmount(triggerStart, triggerEnd) {
+  var _React$useState = React.useState(false),
+    _React$useState2 = _slicedToArray(_React$useState, 2),
+    firstMount = _React$useState2[0],
+    setFirstMount = _React$useState2[1];
+  useLayoutEffect(function () {
+    if (firstMount) {
+      triggerStart();
+      return function () {
+        triggerEnd();
+      };
+    }
+  }, [firstMount]);
+  useLayoutEffect(function () {
+    setFirstMount(true);
+    return function () {
+      setFirstMount(false);
+    };
+  }, []);
+}
+export default useUnmount;