import { FirebaseDataService } from "./FirebaseDataService";
import { database } from "firebase-admin";
import { IEntity } from "../interface";
export declare class EntityService<T extends IEntity> extends FirebaseDataService {
    protected db: database.Database;
    protected root: string;
    constructor(db: database.Database, root: string);
    getAll(): Promise<T[]>;
    getAllAsObject(): Promise<any>;
    get(key: string): Promise<any>;
    /**
     * @param {Object} obj entity object
     * @returns {Promise<String>} promise with string key of created/updated entity
     */
    save(obj: T): Promise<string>;
    create(obj: T): Promise<string>;
    updateAll(modifier: ModifierFunction<T>): Promise<ModificationResults>;
    update(key: string, obj: T): Promise<string>;
    set(key: string, obj: T): Promise<string>;
    remove(key: string): Promise<string>;
    removeAll(ids: string[]): Promise<void>;
    findAllBy(propertyName: string, value: number | string | boolean | null): Promise<T[]>;
}
export type ModifierFunction<T> = {
    (entity: T): T;
};
export type ModificationResults = {
    skipped: string[];
    updated: string[];
};