import { type BlobRef, type BlobStorage, type StoreBlobOptions } from "veryfront/workflow/blob";
/** Fetch-compatible transport used for OAuth and Cloud Storage requests. */
export type GCSFetch = (input: string | URL | Request, init?: RequestInit) => Promise<Response>;
/** Injectable transport and clock seams for deterministic tests. */
export interface GCSBlobStorageDependencies {
    /** Fetch-compatible provider transport. */
    fetch?: GCSFetch;
    /** Millisecond Unix timestamp source. */
    now?: () => number;
}
/** Explicit Google Cloud Storage connection and object-layout configuration. */
export interface GCSBlobStorageConfig {
    /** GCS bucket name. */
    bucket: string;
    /** Google service-account JSON containing `private_key` and `client_email`. */
    serviceAccountKey: string;
    /** Object-key prefix applied verbatim before each blob id. */
    prefix?: string;
    /** Public base URL used only to populate `BlobRef.url`. */
    baseUrl?: string;
    /** Default TTL in seconds. Zero means no expiry. */
    defaultTtl?: number;
    /** Resumable stream chunk size; must be a 256 KiB multiple. Defaults to 8 MiB. */
    resumableChunkSize?: number;
    /** Cancellation signal applied to provider requests and returned streams. */
    signal?: AbortSignal;
}
/** Google Cloud Storage implementation of the framework-owned contract. */
export declare class GCSBlobStorage implements BlobStorage {
    #private;
    constructor(config: GCSBlobStorageConfig, dependencies?: GCSBlobStorageDependencies);
    close(): void;
    put(data: string | Uint8Array | Blob | ReadableStream, options?: StoreBlobOptions): Promise<BlobRef>;
    getStream(id: string): Promise<ReadableStream | null>;
    getText(id: string): Promise<string | null>;
    getBytes(id: string): Promise<Uint8Array | null>;
    delete(id: string): Promise<void>;
    exists(id: string): Promise<boolean>;
    stat(id: string): Promise<BlobRef | null>;
}
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