function svelte_options_invalid_customelement_shadow(node) {
	e(node, 'svelte_options_invalid_customelement_shadow', `"shadow" must be either "open" or "none"\nhttps://svelte.dev/e/svelte_options_invalid_customelement_shadow`);
}
"shadow" must be either "open" or "none"
@param {null | number | NodeLike} node
@returns {never}