Setup winston logger + loki transport

src/logger.ts

@@ -0,0 +1,47 @@
+import { createLogger, format, type Logger, transports } from 'winston';
+import LokiTransport from 'winston-loki';
+import { env } from '@/env/server.mjs';
+
+const logger: Logger = createLogger({
+	level: 'debug',
+	format: format.combine(
+		format.timestamp({
+			format: 'YYYY-MM-DD HH:mm:ss'
+		}),
+		format.errors({ stack: true }),
+		format.splat(),
+		format.json()
+	),
+	defaultMeta: { service: 'api' },
+	transports: [
+		new LokiTransport({
+			level: 'debug',
+			json: true,
+			host: env.LOKI_HOST,
+			basicAuth: `${env.LOKI_USERNAME}:${env.LOKI_PASSWORD}`,
+			labels: { service: 'bus-reminder', environment: env.NODE_ENV }
+		}),
+		new transports.Console({
+			format: format.combine(
+				format.colorize(),
+				format.printf(
+					({ level, message, timestamp, stack }) =>
+						`${timestamp} ${level}: ${stack || message}`
+				)
+			)
+		})
+	],
+	exceptionHandlers: [
+		new transports.Console({
+			format: format.combine(
+				format.colorize(),
+				format.printf(
+					({ level, message, timestamp, stack }) =>
+						`${timestamp} ${level}: ${stack || message}`
+				)
+			)
+		})
+	]
+});
+
+export default logger;