import { Ref } from 'vue';
/**
 * Answers with a `Ref` holding the value an action was last delivered with, `0` until it is delivered once. An
 * action reaches a UI as a broadcast `action:<name>` event whose payload is the value itself
 * (design/ui.md#reading-an-action).
 */
export declare function useSageAction(actionName: string): Ref<boolean | number>;