import { Part } from '../models/types';
import { ArtifactParams, BaseArtifactService } from './BaseArtifactService';
/**
 * An artifact service implementation using Google Cloud Storage (GCS).
 */
export declare class GcsArtifactService implements BaseArtifactService {
    private bucket;
    private storage;
    private bucketName;
    /**
     * Initializes the GcsArtifactService.
     *
     * @param bucketName The name of the bucket to use
     * @param options Optional configuration options for the Google Cloud Storage client
     */
    constructor(bucketName: string, options?: Record<string, any>);
    /**
     * Checks if the filename has a user namespace.
     *
     * @param filename The filename to check
     * @returns True if the filename has a user namespace (starts with "user:"), false otherwise
     */
    private fileHasUserNamespace;
    /**
     * Constructs the blob name in GCS.
     *
     * @param appName The name of the application
     * @param userId The ID of the user
     * @param sessionId The ID of the session
     * @param filename The name of the artifact file
     * @param version The version of the artifact
     * @returns The constructed blob name in GCS
     */
    private getBlobName;
    /**
     * Saves an artifact to the artifact service storage.
     *
     * @param params The artifact parameters
     * @returns The revision ID
     */
    saveArtifact(params: ArtifactParams): Promise<number>;
    /**
     * Gets an artifact from the artifact service storage.
     *
     * @param params The artifact parameters
     * @returns The artifact or undefined if not found
     */
    loadArtifact(params: ArtifactParams): Promise<Part | undefined>;
    /**
     * Lists all the artifact filenames within a session.
     *
     * @param params The artifact parameters
     * @returns A list of all artifact filenames within a session
     */
    listArtifactKeys(params: ArtifactParams): Promise<string[]>;
    /**
     * Deletes an artifact.
     *
     * @param params The artifact parameters
     */
    deleteArtifact(params: ArtifactParams): Promise<void>;
    /**
     * Lists all versions of an artifact.
     *
     * @param params The artifact parameters
     * @returns A list of all available versions of the artifact
     */
    listVersions(params: ArtifactParams): Promise<number[]>;
}