import { type ImageCacheHandler } from '../data.js';
export interface S3CacheOptions {
    region: string;
    bucket: string;
    prefix?: string;
    accessKeyId?: string;
    secretAccessKey?: string;
    endpoint?: string;
    forcePathStyle?: boolean;
    useRedirects?: boolean;
}
export declare class S3Cache implements ImageCacheHandler {
    useRedirects: boolean;
    private client;
    private bucket;
    private prefix;
    private clientInitPromise;
    private isInitialized;
    private endpoint;
    private forcePathStyle;
    constructor(options: S3CacheOptions);
    getKey(hash: string): Promise<{
        value: NodeJS.ReadableStream | Buffer | null;
        ttl?: number;
    }>;
    setKey(hash: string, value: NodeJS.ReadableStream | Buffer, ttl?: number, contentType?: string): Promise<void>;
    delKey(hash: string): Promise<void>;
    getPublicUrl(hash: string): Promise<{
        url: string | null;
        ttl?: number;
    }>;
    private checkIfFileExists;
    private initClient;
    private getObjectKey;
    private ensureClient;
}
/**
 * Creates an S3 cache adapter for image optimization
 * Note: You must install @aws-sdk/client-s3 package to use this adapter
 *
 * @example
 * ```ts
 * import { createS3Cache } from 'sveltekit-image-optimize/cache-adapters/s3';
 *
 * const cache = createS3Cache({
 *   region: 'us-east-1',
 *   bucket: 'my-image-cache',
 *   prefix: 'images', // optional
 *   accessKeyId: 'YOUR_ACCESS_KEY', // optional, can use AWS environment variables
 *   secretAccessKey: 'YOUR_SECRET_KEY', // optional, can use AWS environment variables
 *   endpoint: 'https://custom-endpoint.com', // optional, for S3-compatible services
 *   forcePathStyle: true // optional, for S3-compatible services
 * });
 * ```
 */
export default function createS3Cache(options: S3CacheOptions): ImageCacheHandler;