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