import { OpaqueToken } from '@angular/core';
import { ILogObserver, ILogEvent, ILogListener, LogLevel } from './ng2-log-service';
export declare let ALL: string;
export declare let LOG_LISTENER: OpaqueToken;
export declare class LogObserverService implements ILogObserver {
    private args;
    private registry;
    private listeners;
    constructor(args?: ILogListener[]);
    getListener(listener: Function): ILogListener;
    register(listener: ILogListener): void;
    unregister(listener: ILogListener): void;
    onDidLog(namespace: string, level: LogLevel, action: ILogEvent): void;
    private exactListenersToNotify(namespace, level);
    private extractQualifiedListenersForLogLevel(listeners, level);
    private fuzzyListenersToNotify(namespace, level);
    protected listenersToNotify(namespace: string, level: LogLevel): Array<ILogListener>;
    namespaceInRegistry(namespace: string): boolean;
    countListenersForNamespace(namespace: string): number;
}