/**
 * Base storage provider interface and utilities
 */
import type { IStorageProvider } from '../../types/index.js';
export declare abstract class BaseStorageProvider implements IStorageProvider {
    protected readonly config: any;
    constructor(config: any);
    abstract upload(key: string, content: Buffer | string, contentType?: string): Promise<string>;
    abstract exists(key: string): Promise<boolean>;
    abstract delete(key: string): Promise<void>;
    abstract getUrl(key: string): Promise<string>;
    protected getContentType(key: string): string;
    protected ensureBuffer(content: Buffer | string): Buffer;
    protected handleError(error: any, operation: string): never;
}
//# sourceMappingURL=base.d.ts.map