export = PlaceholderCategoryLoader;
declare class PlaceholderCategoryLoader {
    private connection;
    private db;
    static $inject: string[];
    constructor(connection: any);
    getWorstCategory(countProductIdPairs: {
        productId: number;
        count: number;
    }[], callback: (e: Error, categoryText?: string) => void): void;
    getName(categoryId: number, callback: (e: Error, categoryName?: string) => void): void;
    getChangeInSale(categoryId: number, callback: (e: Error, changeInSale?: number) => void): void;
}