import { firebase } from '../../firebase';
export declare module database {
	interface DataSnapshot {
		exists(): boolean;
		key: string | null;
		val(): any;
	}
	class Query {
		private static registeredListeners;
		private static registeredCallbacks;
		protected path: string;
		constructor(path: string);
		on(eventType: string, callback: (a: DataSnapshot | null, b?: string) => any, cancelCallbackOrContext?: Object | null, context?: Object | null): (a: DataSnapshot | null, b?: string) => any;
		off(eventType?: string, callback?: (a: DataSnapshot, b?: string | null) => any, context?: Object | null): any;
		once(eventType: string, successCallback?: (a: DataSnapshot, b?: string) => any, failureCallbackOrContext?: Object | null, context?: Object | null): Promise<DataSnapshot>;
		private getOnValueEventHandler;
		orderByChild(child: string): Query;
		orderByKey(): Query;
		orderByPriority(): Query;
		orderByValue(): Query;
	}
	class Reference extends Query {
		then: (a?: any) => Promise<any>;
		catch: (a?: Error) => Promise<any>;
		getKey(): string | null;
		get key(): string | null;
		set(value: any, onComplete?: (a: Error | null) => any): Promise<any>;
		child(path: string): database.Reference;
		push(value?: any, onComplete?: (a: Error | null) => any): database.ThenableReference;
		remove(onComplete?: (a: Error | null) => any): Promise<any>;
		onDisconnect(): firebase.OnDisconnect;
		transaction(transactionUpdate: (a: any) => any, onComplete?: (a: Error | null, b: boolean, c: firebase.DataSnapshot | null) => any, applyLocally?: boolean): Promise<any>;
	}
	interface ThenableReference extends Reference {}
	class Database {
		ref(path: string): Reference;
	}
}