Function with_parent

packages/svelte/src/internal/client/proxy.js:65–84

(fn)

	 * @param {() => T} fn
	 */
	var with_parent = (fn) => {
		if (update_version === parent_version) {
			return fn();
		}

		// child source is being created after the initial proxy —
		// prevent it from being associated with the current reaction
		var reaction = active_reaction;
		var version = update_version;

		set_active_reaction(null);
		set_update_version(parent_version);

		var result = fn();

		set_active_reaction(reaction);
		set_update_version(version);

		return result;
	};

	if (is_proxied_array) {
		// We need to create the length source eagerly to ensure that