/**
 * Write an artifact file under the saga's artifacts/ directory.
 */
export declare function writeArtifact(stateRoot: string, sagaId: string, relativePath: string, content: string): Promise<void>;
/**
 * Write a stage-level artifact (e.g., stage-01-report.md).
 */
export declare function writeStageArtifact(stateRoot: string, sagaId: string, stageId: string, suffix: string, content: string): Promise<string>;
/**
 * Read an artifact file. Returns undefined if not found.
 */
export declare function readArtifact(stateRoot: string, sagaId: string, relativePath: string): Promise<string | undefined>;
/**
 * Check if an artifact file exists.
 */
export declare function artifactExists(stateRoot: string, sagaId: string, relativePath: string): Promise<boolean>;
//# sourceMappingURL=artifact-store.d.ts.map