import { FileStorageBackend, FileHandlerConfig } from '../types';
export declare class FileStorageBackendSelector {
    private static instance;
    private backends;
    private constructor();
    static getInstance(): FileStorageBackendSelector;
    selectBackend(config?: FileHandlerConfig | undefined): Promise<FileStorageBackend>;
    private autoSelectBackend;
    private createBackend;
    private testSupabaseConnection;
    private testS3Connection;
    private testAzureConnection;
    private testGCPConnection;
    private testLocalConnection;
}
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