import { DeduperChanges, PollRecord } from "./interfaces";
import { Storage } from "./storage";
export declare class Deduper {
    private storage;
    private changes?;
    private cache;
    constructor(storage: Storage);
    /**
     * Initialize the deduper
     *
     * Note: Should only be called once when the zap is activated
     */
    initialize(currentRecords: PollRecord[]): Promise<boolean>;
    load(): Promise<boolean>;
    /**
     * Find changes
     *
     * Compares the current records with the cached record hashes to find
     * which records are new and which are updated.
     */
    findChanges(currentRecords: PollRecord[]): DeduperChanges;
    private getTimestamp;
    /**
     * Save to the cache
     *
     * Note: Should be called after each poll to update the deduper cache.
     *
     */
    persistChanges(currentRecords: PollRecord[]): Promise<boolean>;
    /**
     * Hash a record
     */
    private hash;
    /**
     * Convert records into cache records
     *
     */
    private getRecords;
}
/**
 * Get a deduper instance
 *
 * @param zapId Zap ID
 */
export declare function getDeduper(zapId: string): Deduper;