import { S3Client } from '@aws-sdk/client-s3';
import { FsAwsS3 } from '@chunkd/fs-aws';
import { SourceCache, SourceChunk } from '@chunkd/middleware';
import type { SourceCallback, SourceRequest } from '@chunkd/source';
/** Exported for testing */
export declare const s3Config: {
    client: S3Client;
    getSignedUrl: <InputTypesUnion extends object, InputType extends InputTypesUnion, OutputType extends import("@aws-sdk/client-s3").__MetadataBearer = import("@aws-sdk/client-s3").__MetadataBearer>(client: import("@aws-sdk/client-s3").__Client<any, InputTypesUnion, import("@aws-sdk/client-s3").__MetadataBearer, any>, command: import("@aws-sdk/client-s3").$Command<InputType, OutputType, any, InputTypesUnion, import("@aws-sdk/client-s3").__MetadataBearer>, options?: import("@smithy/types").RequestPresigningArguments) => Promise<string>;
};
export declare const s3Fs: FsAwsS3;
export declare const s3FsPublic: FsAwsS3;
/**
 * Sign a GET request to S3 for one hour
 * @param target s3 location to presign
 * @returns
 */
export declare function signS3Get(target: URL): Promise<string>;
export declare const Fsa: import("@chunkd/fs/build/src/file.system.abstraction.js").FileSystemAbstraction;
export declare const FsaChunk: SourceChunk;
export declare const FsaCache: SourceCache;
export declare const FsaLog: {
    name: string;
    count: number;
    requests: string[];
    fetch(req: SourceRequest, next: SourceCallback): Promise<ArrayBuffer>;
    reset(): void;
};
/**
 * Middleware to cache responses locally into .cache/
 *
 * very useful when developing with remote sources as it avoids repeatedly downloading the same data
 */
export declare const FsaLocalCache: {
    name: string;
    remotes: Set<string>;
    fetch(req: SourceRequest, next: SourceCallback): Promise<ArrayBuffer>;
};
/**
 * When chunkd moves to URLs this can be removed
 *
 * But reading a file as a string with `file://....` does not work in node
 * it needs to be converted with `fileURLToPath`
 */
export declare function urlToString(u: URL): string;
/**
 *  Ensure a folder has a trailing slash
 **/
export declare function stringToUrlFolder(str: string): URL;