/**
* Production Logger
* Winston-based structured logging
*/
import winston from 'winston';
const { combine, timestamp, errors, json, printf, colorize } = winston.format;
// Custom format for development
const devFormat = printf(({ level, message, timestamp, ...meta }) => {
const metaStr = Object.keys(meta).length ? JSON.stringify(meta, null, 2) : '';
return `${timestamp} [${level}]: ${message} ${metaStr}`;
});
// Determine if we're in production
const isProduction = process.env.NODE_ENV === 'production';
export const logger = winston.createLogger({
level: process.env.LOG_LEVEL || (isProduction ? 'info' : 'debug'),
format: combine(
timestamp({ format: 'YYYY-MM-DD HH:mm:ss.SSS' }),
errors({ stack: true }),
isProduction ? json() : combine(colorize(), devFormat)
),
defaultMeta: { service: 'nlp-interface' },
transports: [
new winston.transports.Console(),
],
});
// Add file transport in production
if (isProduction) {
logger.add(new winston.transports.File({
filename: 'logs/error.log',
level: 'error',
maxsize: 10485760, // 10MB
maxFiles: 5,
}));
logger.add(new winston.transports.File({
filename: 'logs/combined.log',
maxsize: 10485760,
maxFiles: 10,
}));
}
export function createChildLogger(context: Record<string, unknown>) {
return logger.child(context);
}
