import { config } from '../config.js';
export type LogLevel = 'error' | 'warn' | 'info' | 'debug';
const LOG_LEVELS: Record<LogLevel, number> = {
error: 0,
warn: 1,
info: 2,
debug: 3,
};
class Logger {
private level: number;
constructor(level: LogLevel) {
this.level = LOG_LEVELS[level];
}
private log(level: LogLevel, message: string, data?: any) {
if (LOG_LEVELS[level] <= this.level) {
const timestamp = new Date().toISOString();
const logEntry = {
timestamp,
level,
message,
...(data && { data }),
};
// Use console.error for all logs in MCP server to avoid stdout conflicts
console.error(JSON.stringify(logEntry));
}
}
error(message: string, error?: Error | any) {
this.log('error', message, {
error: error instanceof Error ? {
name: error.name,
message: error.message,
stack: error.stack,
} : error,
});
}
warn(message: string, data?: any) {
this.log('warn', message, data);
}
info(message: string, data?: any) {
this.log('info', message, data);
}
debug(message: string, data?: any) {
this.log('debug', message, data);
}
}
export const logger = new Logger(config.logLevel as LogLevel);