/**
* Simple console logging replacement for Winston
*/
interface Logger {
info(message: string, meta?: any): void;
error(message: string | Error, meta?: any): void;
warn(message: string, meta?: any): void;
debug(message: string, meta?: any): void;
child(meta: any): Logger;
}
const formatMessage = (level: string, message: string | Error, meta?: any): string => {
const timestamp = new Date().toISOString();
const msg = message instanceof Error ? message.message : message;
const stack = message instanceof Error ? message.stack : undefined;
const metaStr = meta ? ` ${JSON.stringify(meta)}` : '';
let result = `[${timestamp}] ${level.toUpperCase()}: ${msg}${metaStr}`;
if (stack) {
result += `\n${stack}`;
}
return result;
};
const createLogger = (baseMeta?: any): Logger => ({
info: (message: string, meta?: any) => {
const combinedMeta = baseMeta ? { ...baseMeta, ...meta } : meta;
// Use stderr for all logging in MCP servers to avoid interfering with JSON-RPC on stdout
console.error(formatMessage('info', message, combinedMeta));
},
error: (message: string | Error, meta?: any) => {
const combinedMeta = baseMeta ? { ...baseMeta, ...meta } : meta;
console.error(formatMessage('error', message, combinedMeta));
},
warn: (message: string, meta?: any) => {
const combinedMeta = baseMeta ? { ...baseMeta, ...meta } : meta;
console.error(formatMessage('warn', message, combinedMeta));
},
debug: (message: string, meta?: any) => {
const combinedMeta = baseMeta ? { ...baseMeta, ...meta } : meta;
console.error(formatMessage('debug', message, combinedMeta));
},
child: (meta: any) => createLogger(baseMeta ? { ...baseMeta, ...meta } : meta),
});
const logger = createLogger();
export default logger;
