export interface ILogger {
    debug(message?: any, ...params: any[]): void;
    info(message?: any, ...params: any[]): void;
    warn(message?: any, ...params: any[]): void;
    error(message?: any, ...params: any[]): void;
    getLevel(): LogLevelThreshold;
    setLevel(level: LogLevelThreshold): void;
}
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
export type LogLevelThreshold = LogLevel | 'off';
export declare abstract class BaseLogger implements ILogger {
    private level;
    private static severity;
    constructor(level?: LogLevelThreshold);
    abstract log(lvl: LogLevel, msg?: any, ...extra: any[]): void;
    doLog(msgLevel: LogLevel, message?: any, ...params: any[]): void;
    debug(message?: any, ...params: any[]): void;
    info(message?: any, ...params: any[]): void;
    warn(message?: any, ...params: any[]): void;
    error(message?: any, ...params: any[]): void;
    getLevel(): LogLevelThreshold;
    setLevel(level: LogLevelThreshold): void;
}
export declare class ConsoleLogger extends BaseLogger {
    log(level: LogLevel, msg?: string, ...params: any[]): void;
}
export declare class NoOpLogger extends BaseLogger {
    log(_l: LogLevel, _m?: string, ..._p: any[]): void;
}
export declare class Logger {
    static debug(message?: any, ...params: any[]): void;
    static info(message?: any, ...params: any[]): void;
    static warn(message?: any, ...params: any[]): void;
    static error(message?: any, ...params: any[]): void;
    static getLevel(): LogLevelThreshold;
    static setLevel(level: LogLevelThreshold): void;
    private static defaultLogger;
    static setDefaultLogger(logger: ILogger): void;
}
export declare const withTiming: <T>(fn: () => T, onDidComplete: (elapsed: number) => void) => T;
export declare const withTimingAsync: <T>(fn: () => Promise<T>, onDidComplete: (elapsed: number) => void) => Promise<T>;
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