export type LogMessage = string | (() => string);
export type LogLevel = "debug" | "info" | "warn" | "error";
export interface Logger {
    debug(message: LogMessage): void;
    info(message: LogMessage): void;
    warn(message: LogMessage): void;
    error(message: LogMessage): void;
}
export interface Formatter {
    format(level: LogLevel, message: string, time?: Date): string;
}
export declare class BaseFormatter {
    private readonly tidToken;
    protected tid(): string;
    protected contextString(): string;
}
export declare class PrettyFormatter extends BaseFormatter implements Formatter {
    protected colors: Record<string, string>;
    protected useColors: boolean;
    constructor({ useColors }?: {
        useColors?: boolean | undefined;
    });
    protected label(severity: string): string;
    format(level: LogLevel, message: string, time?: Date): string;
}
export declare class PlainFormatter extends BaseFormatter implements Formatter {
    format(level: LogLevel, message: string, time?: Date): string;
}
export declare class WithoutTimestampFormatter extends PrettyFormatter {
    format(level: LogLevel, message: string): string;
}
export declare class JsonFormatter extends BaseFormatter implements Formatter {
    format(level: LogLevel, message: string, time?: Date): string;
}
export declare const Formatters: {
    Base: typeof BaseFormatter;
    Pretty: typeof PrettyFormatter;
    Plain: typeof PlainFormatter;
    WithoutTimestamp: typeof WithoutTimestampFormatter;
    JSON: typeof JsonFormatter;
};
export declare class SidekiqLogger implements Logger {
    formatter: Formatter;
    private readonly base;
    constructor(base?: Console, formatter?: Formatter);
    debug(message: LogMessage): void;
    info(message: LogMessage): void;
    warn(message: LogMessage): void;
    error(message: LogMessage): void;
    private log;
}
export declare const createLogger: (base?: Console) => Logger;
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