import { EventEmitter } from 'eventemitter3';
import type { Redis } from 'ioredis';
import { type Collection, type Db } from 'mongodb';
import { type QueueOptions } from 'prom-utils';
import type { ChangeOptions, ChangeStreamOptions, Events, JSONSchema, OperationType, ProcessChangeStreamRecords, ProcessInitialScanRecords, ScanOptions, State, SyncOptions } from './types.js';
/**
 * Get Redis keys used for the collection.
 */
export declare const getKeys: (collection: Collection, options: SyncOptions) => {
    scanCompletedKey: string;
    lastScanIdKey: string;
    changeStreamTokenKey: string;
    schemaKey: string;
    lastChangeProcessedAtKey: string;
    lastScanProcessedAtKey: string;
    resyncKey: string;
};
export declare function initSync<ExtendedEvents extends EventEmitter.ValidEventTypes>(redis: Redis, collection: Collection, options?: SyncOptions): {
    runInitialScan: <T = any>(processRecords: ProcessInitialScanRecords, options?: QueueOptions & ScanOptions<T>) => Promise<{
        start: () => Promise<void>;
        stop: () => Promise<void>;
        restart: () => Promise<void>;
        state: Pick<{
            get: () => State;
            change: (newState: State) => void;
            waitForChange: (...newStates: State[]) => Promise<void>;
            is: (...states: State[]) => boolean;
            canChange: (newState: State) => boolean;
            maybeChange: (newState: State) => boolean;
            getElapsedTime: () => number;
        }, "get" | "is">;
    }>;
    processChangeStream: <T extends OperationType[] | undefined = undefined>(processRecords: ProcessChangeStreamRecords<T>, options?: QueueOptions & ChangeStreamOptions<T>) => Promise<{
        start: () => Promise<void>;
        stop: () => Promise<void>;
        restart: () => Promise<void>;
        state: Pick<{
            get: () => State;
            change: (newState: State) => void;
            waitForChange: (...newStates: State[]) => Promise<void>;
            is: (...states: State[]) => boolean;
            canChange: (newState: State) => boolean;
            maybeChange: (newState: State) => boolean;
            getElapsedTime: () => number;
        }, "get" | "is">;
    }>;
    reset: () => Promise<void>;
    getCollectionSchema: (db: Db) => Promise<JSONSchema>;
    detectSchemaChange: (db: Db, options?: ChangeOptions) => Promise<{
        start: () => void;
        stop: () => void;
    }>;
    detectResync: (resyncCheckInterval?: number) => {
        start: () => void;
        stop: () => void;
    };
    keys: {
        scanCompletedKey: string;
        lastScanIdKey: string;
        changeStreamTokenKey: string;
        schemaKey: string;
        lastChangeProcessedAtKey: string;
        lastScanProcessedAtKey: string;
        resyncKey: string;
    };
    emitter: EventEmitter<Events | ExtendedEvents, any>;
    /**
     * Pause and resume all syncing functions at once. A call to `stop`
     * for `runInitialScan` or `processChangeStream` will resume to prevent
     * hanging.
     */
    pausable: {
        pause: () => void;
        resume: () => void;
        maybeBlock: () => Promise<void> | undefined;
        readonly isPaused: boolean;
    };
};