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website/node_modules/@mui/utils/contains/contains.d.ts

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+/**
+ * Copied from @base-ui/utils
+ *
+ * Shadow DOM-aware containment check.
+ *
+ * Native `parent.contains(child)` returns `false` when the child is inside a
+ * shadow root that is a descendant of the parent. This function handles that
+ * case by traversing up through shadow root hosts.
+ *
+ * @param parent - The potential ancestor element.
+ * @param child - The potential descendant element.
+ * @returns Whether `parent` contains `child`, even across shadow root boundaries.
+ */
+export default function contains(parent: Element | null | undefined, child: Element | null | undefined): boolean;