import { Plugin } from '../../types.js';
export type LogLevel = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'fatal';
export type LogMessage = {
    level: LogLevel;
    message: string;
    timestamp: Date;
    subSystemName: string;
    module?: string;
    header?: string;
    args?: unknown[];
};
export declare const ComposaicSubSystemName = "composaic";
/**
 * Logger extension point.
 *
 * Extensions for this extension point will need to implement these methods.
 */
export interface LoggerExtensionPoint {
    getSubSystemName(): string;
    setLogCallback(log: (message: LogMessage) => void): void;
}
export declare class LoggerPlugin extends Plugin {
    start(): Promise<void>;
    stop(): Promise<void>;
    log(message: LogMessage): void;
}
export declare class SimpleLoggerExtension implements LoggerExtensionPoint {
    private log?;
    getSubSystemName(): string;
    setLogCallback(log: (message: LogMessage) => void): void;
}