import type { Logger } from './types.js';
export declare class ConsoleLogger implements Logger {
    private prefix;
    constructor(prefix?: string);
    debug(message: string, ...args: unknown[]): void;
    info(message: string, ...args: unknown[]): void;
    warn(message: string, ...args: unknown[]): void;
    error(message: string, ...args: unknown[]): void;
}
export declare class SilentLogger implements Logger {
    debug(): void;
    info(): void;
    warn(): void;
    error(): void;
}
/**
 * Appends structured lines to a log file (best-effort — never throws into the
 * caller). Used to give the kernel gateway a durable trace of routing/swap/
 * truncation decisions during a TUI session, since its console is owned by the
 * TUI. Read the file to see exactly why a turn died mid-task.
 */
export declare class FileLogger implements Logger {
    private file;
    private prefix;
    constructor(file: string, prefix?: string);
    private write;
    debug(message: string, ...args: unknown[]): void;
    info(message: string, ...args: unknown[]): void;
    warn(message: string, ...args: unknown[]): void;
    error(message: string, ...args: unknown[]): void;
}