import { S3Config, PresignedUploadUrl, PresignedDownloadUrl } from './types';
export declare class S3Adapter {
    private client;
    private presignClient;
    private config;
    constructor(config: S3Config);
    private validateKey;
    generateUploadUrl(params: {
        key: string;
        contentType: string;
    }): Promise<PresignedUploadUrl>;
    generateDownloadUrl(params: {
        key: string;
    }): Promise<PresignedDownloadUrl>;
    uploadDirect(params: {
        key: string;
        content: string | Buffer;
        contentType: string;
    }): Promise<void>;
    deleteObject(params: {
        key: string;
    }): Promise<void>;
    downloadObject(params: {
        key: string;
    }): Promise<Buffer>;
}
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