import { IncomingFile, PresignedUpload, StoredObject } from '../../interfaces/file.interface';
import { ExistsResult, StorageAdapter } from '../../interfaces/storage-adapter.interface';
import { AzureStorageConfig } from '../../interfaces/upload-options.interface';
/**
 * Azure Blob adapter with REAL SAS token generation (the piece missing in most codebases,
 * where getSignedUrl just returns the raw blob URL).
 */
export declare class AzureBlobAdapter implements StorageAdapter {
    private readonly cfg;
    readonly name = "azure";
    private readonly azure;
    private readonly credential;
    private readonly container;
    constructor(cfg: AzureStorageConfig);
    private blob;
    private sas;
    upload(file: IncomingFile, key: string, meta?: Record<string, string>): Promise<StoredObject>;
    download(key: string): Promise<NodeJS.ReadableStream>;
    delete(key: string): Promise<void>;
    exists(key: string): Promise<ExistsResult>;
    getSignedUploadUrl(key: string, opts: {
        expiresIn: number;
        contentType?: string;
    }): Promise<PresignedUpload>;
    getSignedDownloadUrl(key: string, opts: {
        expiresIn: number;
    }): Promise<string>;
    copy(srcKey: string, destKey: string): Promise<void>;
    publicUrl(key: string): string;
    readRange(key: string, start: number, end: number): Promise<Buffer>;
}