Function is_dirty

packages/svelte/src/internal/client/runtime.js:153–191

(reaction)

 * @returns {boolean}
 */
export function is_dirty(reaction) {
	var flags = reaction.f;

	if ((flags & DIRTY) !== 0) {
		return true;
	}

	if (flags & DERIVED) {
		reaction.f &= ~WAS_MARKED;
	}

	if ((flags & MAYBE_DIRTY) !== 0) {
		var dependencies = /** @type {Value[]} */ (reaction.deps);
		var length = dependencies.length;

		for (var i = 0; i < length; i++) {
			var dependency = dependencies[i];

			if (is_dirty(/** @type {Derived} */ (dependency))) {
				update_derived(/** @type {Derived} */ (dependency));
			}

			if (dependency.wv > reaction.wv) {
				return true;
			}
		}

		if (
			(flags & CONNECTED) !== 0 &&
			// During time traveling we don't want to reset the status so that
			// traversal of the graph in the other batches still happens
			batch_values === null
		) {
			set_signal_status(reaction, CLEAN);
		}
	}

	return false;
}

/**
 * @param {Value} signal