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isNodeAChild

This helper is not exported by @kousta-ui/helpers in the current codebase.

If you need this behavior, prefer the native DOM API:

const isChild = parent?.contains(child) ?? false;

Use Element.contains (or Node.contains) with optional chaining:

const parent = document.getElementById("container");
const target = document.getElementById("button");

const isChild = parent?.contains(target) ?? false;