import type { Logger as LoggerInterface, Reporter, Filter, Extension, Options, LogFn, SaveState, LogLevel } from './logger.h';
declare class Logger implements LoggerInterface {
    private static level;
    private static instances;
    private static enabledName;
    private static enabledLevel;
    private name;
    private key;
    private level?;
    private beforeReporters;
    private reporters;
    private filters;
    private extensions;
    private defaults;
    debug: LogFn;
    error: LogFn;
    fatal: LogFn;
    info: LogFn;
    trace: LogFn;
    warn: LogFn;
    private static onChange;
    constructor(options?: Options);
    private static save;
    static load(state: SaveState): void;
    static setLevel(newLevel: LogLevel): void;
    static setOnChange(onChange: (typeof Logger)['onChange']): void;
    static enable(level: string, namespace?: string): void;
    static disable(level: string, namespace?: string): void;
    static clear(): void;
    static setGlobalReporters(reporters: Reporter | Reporter[]): void;
    child(options: Options | string): Logger;
    addBeforeReporter(reporter: Reporter): void;
    setBeforeReporters(reporters: Reporter | Reporter[]): void;
    addReporter(reporter: Reporter): void;
    setReporters(reporters: Reporter | Reporter[]): void;
    addFilter(filter: Filter): void;
    setFilters(filters: Filter | Filter[]): void;
    addExtension(extension: Extension): void;
    setExtensions(extensions: Extension | Extension[]): void;
    setLevel(level: number | undefined): void;
    private checkEnabled;
    private createLogObj;
    private log;
}
export { Logger };
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