Rich-Harris / stacking-order

This code has a potential cycle in it:

Lines 94 to 110 in 4ac3037

    
           /** @param {HTMLElement} node */ 
        
           function get_ancestors(node) { 
        
           	const ancestors = []; 
        
           	while (node) { 
        
           		ancestors.push(node); 
        
           		node = get_parent(node); 
        
           	} 
        
           	return ancestors; // [ node, ... <body>, <html>, document ] 
        
           } 
        
           /** @param {HTMLElement} node */ 
        
           function get_parent(node) { 
        
           	// @ts-ignore 
        
           	return node.parentNode?.host || node.parentNode; 
        
           }

Context:
toeverything/blocksuite#6471 (comment)

I think this change fixes the cycle:

-  // @ts-ignore
-  return node.parentNode?.host || node.parentNode; 
+  const { parentNode } = node;
+  if (parentNode && parentNode instanceof ShadowRoot) {
+    return parentNode.host
+  }
+  return parentNode;

	/** @param {HTMLElement} node */
	function get_ancestors(node) {
	const ancestors = [];

	while (node) {
	ancestors.push(node);
	node = get_parent(node);
	}

	return ancestors; // [ node, ... <body>, <html>, document ]
	}

	/** @param {HTMLElement} node */
	function get_parent(node) {
	// @ts-ignore
	return node.parentNode?.host \|\| node.parentNode;
	}

Potential cycle