export declare class Logger {
    private level;
    private writer;
    constructor(level?: number, writer?: {
        write(): void;
    });
    debug(tag: any, body: any): void;
    info(tag: any, body?: any): void;
    warn(tag: any, body: any): void;
    fromStack(depth?: number): string;
}
export declare const DEBUG = 0;
export declare const INFO = 1;
export declare const WARN = 2;
export declare class DummyLogger {
    debug(): void;
    info(): void;
    warn(): void;
}