import { Readable, ReadableParams } from './readable';
export interface SecondaryIndexParams<S, H extends keyof S, RK extends keyof S> extends ReadableParams<S, H, RK> {
    index: string;
}
export declare class SecondaryIndex<S, H extends keyof S, RK extends keyof S = never> extends Readable<S, H, RK> {
    private readonly index;
    /**
     * SecondaryIndex Constructor
     * @param {SecondaryIndexParams<S, H, RK>} params
     */
    constructor(params: SecondaryIndexParams<S, H, RK>);
}