/**
 * Result of running an action, optionally on a target.
 * Instances may add further information beyond boolean success or failure.
 * Useful when promise chaining, to allow results to be included along with the target.
 */
export interface ActionResult<T = undefined> {
    /**
     * Target on which we ran the action, if there is one.
     */
    readonly target: T;
    /**
     * Whether or not the action succeeded.
     */
    readonly success: boolean;
    readonly error?: Error;
    readonly errorStep?: string;
}
export declare function isActionResult(a: any): a is ActionResult;
/**
 * Convenient implementation of ActionResult
 */
export declare class SimpleActionResult<T> implements ActionResult<T> {
    readonly target: T;
    readonly success: boolean;
    constructor(target: T, success: boolean);
}
export declare function successOn<T>(t: T): ActionResult<T>;
export declare function failureOn<T>(t: T, err: Error, f?: any): ActionResult<T>;
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