/**
 * Plan engine error types.
 *
 * All pre-mutation failures throw typed errors with machine-readable codes.
 */
export declare class PlanError extends Error {
    readonly code: string;
    readonly stepId?: string;
    readonly details?: unknown;
    constructor(code: string, message: string, stepId?: string, details?: unknown);
}
export declare function planError(code: string, message: string, stepId?: string, details?: unknown): PlanError;
//# sourceMappingURL=errors.d.ts.map