export declare abstract class Logger {
    abstract log(...s: any[]): void;
    abstract error(...s: any[]): void;
}
export declare class ConsoleLogger extends Logger {
    log(...s: string[]): void;
    error(...s: string[]): void;
}
export declare class DisabledLogger extends Logger {
    log(..._s: string[]): void;
    error(..._s: string[]): void;
}
export declare class MemoryLogger extends Logger {
    logs: string[];
    errors: string[];
    log(...s: string[]): void;
    error(...s: string[]): void;
}