up n_m

node_modules/@docusaurus/theme-common/lib/hooks/useMutationObserver.js

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+import { useEffect } from 'react';
+import { useEvent, useShallowMemoObject } from '../utils/reactUtils';
+const DefaultOptions = {
+    attributes: true,
+    characterData: true,
+    childList: true,
+    subtree: true,
+};
+export function useMutationObserver(target, callback, options = DefaultOptions) {
+    const stableCallback = useEvent(callback);
+    // MutationObserver options are not nested much
+    // so this should be to memo options in 99%
+    // TODO handle options.attributeFilter array
+    const stableOptions = useShallowMemoObject(options);
+    useEffect(() => {
+        const observer = new MutationObserver(stableCallback);
+        if (target) {
+            observer.observe(target, stableOptions);
+        }
+        return () => observer.disconnect();
+    }, [target, stableCallback, stableOptions]);
+}
+//# sourceMappingURL=useMutationObserver.js.map