import { BaseStorage, BaseStorageOptions, File, FileInit, FilePart, FileQuery, IncomingMessage, LocalMetaStorageOptions, MetaStorage, UploadxErrorResponse } from '@uploadx/core';
import { GoogleAuth, GoogleAuthOptions } from 'google-auth-library';
import { GCSMetaStorageOptions } from './gcs-meta-storage';
export interface ClientError extends Error {
    code: string;
    response?: Record<string, any>;
    config: Record<string, any>;
}
export declare function getRangeEnd(range: string): number;
export declare function buildContentRange(part: Partial<FilePart> & GCSFile): string;
export interface GCStorageOptions extends BaseStorageOptions<GCSFile>, GoogleAuthOptions {
    /**
     * Google Cloud Storage bucket
     */
    bucket?: string;
    /**
     * Force compatible client upload directly to GCS
     */
    clientDirectUpload?: boolean;
    /**
     * Metafiles storage directory.
     * When set, metafiles are stored locally instead of in GCS.
     */
    metaDir?: string;
    /**
     * Configure metafiles storage
     * @example
     * ```ts
     * Using local metafiles
     * const storage = new GCStorage({
     *   bucket: 'uploads',
     *   metaStorageOptions: { directory: '/tmp/upload-metafiles' }
     * })
     * ```
     * Using a separate bucket for metafiles
     * ```ts
     * const storage = new GCStorage({
     *   bucket: 'uploads',
     *   metaStorageOptions: { bucket: 'upload-metafiles' }
     * })
     * ```
     */
    metaStorageOptions?: LocalMetaStorageOptions | GCSMetaStorageOptions;
    /** @deprecated Use {@link metaStorageOptions} instead */
    metaStorageConfig?: LocalMetaStorageOptions | GCSMetaStorageOptions;
}
export declare class GCSFile extends File {
    GCSUploadURI?: string;
    uri?: string;
}
/**
 * Google cloud storage based backend.
 * @example
 * ```ts
 *  const storage = new GCStorage({
 *    bucket: <YOUR_BUCKET>,
 *    keyFile: <PATH_TO_KEY_FILE>,
 *    metaStorage: new MetaStorage(),
 *    clientDirectUpload: true,
 *    maxFileSize: '15GB',
 *    allowedMimeTypes: ['video/*', 'image/*'],
 *    namingFunction: file => file.originalName
 *  });
 * ```
 */
export declare class GCStorage extends BaseStorage<GCSFile> {
    options: GCStorageOptions;
    bucket: string;
    authClient: GoogleAuth;
    storageBaseURI: string;
    uploadBaseURI: string;
    meta: MetaStorage<GCSFile>;
    constructor(options?: GCStorageOptions);
    normalizeError(error: ClientError): UploadxErrorResponse;
    accessCheck(): Promise<any>;
    create(req: IncomingMessage, config: FileInit): Promise<GCSFile>;
    write(part: FilePart | FileQuery): Promise<GCSFile>;
    delete({ id }: FileQuery): Promise<GCSFile[]>;
    protected _write(part: Partial<FilePart> & GCSFile): Promise<number>;
    private _onComplete;
}