/**
 * @fractary/core - Google Drive Storage Implementation
 *
 * Google Drive storage backend for file operations.
 * Uses googleapis with lazy loading.
 *
 * Note: Google Drive doesn't use traditional file paths. This implementation
 * maps path-like identifiers to Google Drive files by name within a folder.
 */
import { Storage, GDriveStorageConfig } from './types';
/**
 * Google Drive storage implementation
 */
export declare class GDriveStorage implements Storage {
    private config;
    private driveClient;
    constructor(config: GDriveStorageConfig);
    /**
     * Get or create the Google Drive client (lazy loaded)
     */
    private getClient;
    /**
     * Get the parent folder ID (internal helper)
     */
    private getParentFolderId;
    /**
     * Extract file name from path-like ID
     */
    private getFileName;
    /**
     * Escape a string for use in Google Drive query syntax
     * Single quotes must be escaped with backslash
     */
    private escapeQueryString;
    /**
     * Check if a string looks like a Google Drive file ID
     * Drive file IDs are typically 28-44 characters, alphanumeric with - and _
     */
    private isFileId;
    /**
     * Check if an error is a "not found" error
     * Google APIs uses error.code (number) or error.errors[].reason
     */
    private isNotFoundError;
    /**
     * Find a file by name in the configured folder
     */
    private findFile;
    /**
     * Write content to Google Drive
     */
    write(id: string, content: string | Buffer): Promise<string>;
    /**
     * Read content from Google Drive
     */
    read(id: string): Promise<string | null>;
    /**
     * Check if file exists in Google Drive
     */
    exists(id: string): Promise<boolean>;
    /**
     * List files in the configured Google Drive folder
     */
    list(prefix?: string): Promise<string[]>;
    /**
     * Delete file from Google Drive
     */
    delete(id: string): Promise<void>;
    /**
     * Get a shareable URL for the file
     */
    getUrl(id: string, _expiresIn?: number): Promise<string | null>;
    /**
     * Get the configured folder ID
     */
    getFolderId(): string;
}
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