import { Document } from 'mongoose';
import { AccountsService } from '../../modules';
import { IsViewable } from '../../types';
export type ViewedByFetchOptions = {
    includeViewedBy?: boolean;
    includeViewedByIds?: boolean;
};
export declare function ViewedByOptions<TBase extends new (...args: any[]) => any>(Base: TBase, options: {
    requiredPermissions?: string[];
}): {
    new (...args: any[]): {
        [x: string]: any;
        includeViewedBy?: boolean;
        includeViewedByIds?: boolean;
        viewedBy?: string;
    };
} & TBase;
export declare function populateViewedBy(options: {
    includeViewedBy?: boolean;
    includeViewedByIds?: boolean;
    viewedBy?: string;
}, items: (Document & IsViewable)[], accountsService: AccountsService): Promise<void>;