import { BaseIndex } from './base';
import { NamespacedSecondaryIndexOptions, AnonymousSecondaryIndexOptions } from './options';
export declare class AnonymousSecondaryIndex<T = any> extends BaseIndex<T> {
    readonly options: AnonymousSecondaryIndexOptions<T>;
    constructor(options: AnonymousSecondaryIndexOptions<T>);
}
export declare class NamespacedSecondaryIndex<T = any> extends BaseIndex<T> {
    readonly options: NamespacedSecondaryIndexOptions<T>;
    constructor(options: NamespacedSecondaryIndexOptions<T>);
}
export declare type SecondaryIndex<T = any> = NamespacedSecondaryIndex<T> | AnonymousSecondaryIndex<T>;
export declare function isSecondary<T>(index: BaseIndex<T>): index is SecondaryIndex<T>;