svelte/src/compiler/compile/render_dom/wrappers/shared/is_head.js

/**
 * @param {import("estree").Node} node
 */
export function is_head(node) {
	return (
		node &&
		node.type === 'MemberExpression' &&
		node.object['name'] === '@_document' &&
		node.property['name'] === 'head'
	);
}