/// <reference types="node" />
import { ReadStream } from "fs";
export declare function fingerprint(document: Document): Promise<string>;
declare type Document = ReadStream;
/** Fingerprints a document so that the same document won't be indexed twice. Chapter 20 (pg.446) of IR book*/
export declare class DocumentFingerPrinterFullHash {
    #private;
    /** Checks whether the document already exists in storage.
     *
     */
    has(document: Document | string): Promise<void>;
    /** Adds the document fingerprint to some storage mechanism */
    add(document: Document): Promise<void>;
}
export declare class NoDocumentFingerPrinter {
    #private;
    /** Checks whether the document already exists in storage.
     *
     */
    has(_document: Document | string): Promise<boolean>;
    /** Adds the document fingerprint to some storage mechanism */
    add(_document: Document): Promise<void>;
}
export {};
//# sourceMappingURL=DocumentFingerPrinter.d.ts.map