import { Event } from '../../../base/common/event.js';
import { Disposable, IDisposable } from '../../../base/common/lifecycle.js';
import { RawContextKey } from '../../contextkey/common/contextkey.js';
export declare const ILogService: import("../../instantiation/common/instantiation.js").ServiceIdentifier<ILogService>;
export declare enum LogLevel {
    Off = 0,
    Trace = 1,
    Debug = 2,
    Info = 3,
    Warning = 4,
    Error = 5
}
export declare const DEFAULT_LOG_LEVEL: LogLevel;
export interface ILogger extends IDisposable {
    onDidChangeLogLevel: Event<LogLevel>;
    getLevel(): LogLevel;
    setLevel(level: LogLevel): void;
    trace(message: string, ...args: any[]): void;
    debug(message: string, ...args: any[]): void;
    info(message: string, ...args: any[]): void;
    warn(message: string, ...args: any[]): void;
    error(message: string | Error, ...args: any[]): void;
    /**
     * An operation to flush the contents. Can be synchronous.
     */
    flush(): void;
}
export interface ILogService extends ILogger {
    readonly _serviceBrand: undefined;
}
export declare abstract class AbstractLogger extends Disposable implements ILogger {
    private level;
    private readonly _onDidChangeLogLevel;
    readonly onDidChangeLogLevel: Event<LogLevel>;
    setLevel(level: LogLevel): void;
    getLevel(): LogLevel;
    protected checkLogLevel(level: LogLevel): boolean;
    protected canLog(level: LogLevel): boolean;
    abstract trace(message: string, ...args: any[]): void;
    abstract debug(message: string, ...args: any[]): void;
    abstract info(message: string, ...args: any[]): void;
    abstract warn(message: string, ...args: any[]): void;
    abstract error(message: string | Error, ...args: any[]): void;
    abstract flush(): void;
}
export declare class ConsoleLogger extends AbstractLogger implements ILogger {
    private readonly useColors;
    constructor(logLevel?: LogLevel, useColors?: boolean);
    trace(message: string, ...args: any[]): void;
    debug(message: string, ...args: any[]): void;
    info(message: string, ...args: any[]): void;
    warn(message: string | Error, ...args: any[]): void;
    error(message: string, ...args: any[]): void;
    flush(): void;
}
export declare class MultiplexLogger extends AbstractLogger implements ILogger {
    private readonly loggers;
    constructor(loggers: ReadonlyArray<ILogger>);
    setLevel(level: LogLevel): void;
    trace(message: string, ...args: any[]): void;
    debug(message: string, ...args: any[]): void;
    info(message: string, ...args: any[]): void;
    warn(message: string, ...args: any[]): void;
    error(message: string | Error, ...args: any[]): void;
    flush(): void;
    dispose(): void;
}
export declare function LogLevelToString(logLevel: LogLevel): string;
export declare const CONTEXT_LOG_LEVEL: RawContextKey<string>;