import pino from "pino";
// Note: We can't import config here as it would create a circular dependency
// The logger is used by config.ts, so we'll use process.env directly
const isDevelopment = process.env.NODE_ENV === "development";
const logLevel = process.env.LOG_LEVEL || (isDevelopment ? "debug" : "info");
// Create logger instance that always writes to stderr
// This is critical for stdio mode where stdout is used for MCP protocol communication
export const logger = pino(
{
level: logLevel,
transport: isDevelopment
? {
target: "pino-pretty",
options: {
colorize: true,
translateTime: "SYS:standard",
ignore: "pid,hostname",
destination: 2, // stderr
},
}
: undefined,
formatters: {
level: (label: string) => {
return { level: label };
},
},
timestamp: pino.stdTimeFunctions.isoTime,
},
pino.destination({ dest: 2, sync: false }),
); // Write to stderr (fd 2)
// Export logger methods for convenience
export const log = {
debug: logger.debug.bind(logger),
info: logger.info.bind(logger),
warn: logger.warn.bind(logger),
error: logger.error.bind(logger),
fatal: logger.fatal.bind(logger),
};
