feat(#65): Add winston and axiom logging

src/lib/utils/logger/logger.ts

@@ -0,0 +1,40 @@
+import { createLogger, transports, format } from 'winston';
+import { WinstonTransport as AxiomTransport } from '@axiomhq/winston';
+import { VITE_AXIOM_DATASET, VITE_AXIOM_TOKEN } from '$env/static/private';
+
+const axiomTransport = new AxiomTransport({
+	dataset: VITE_AXIOM_DATASET,
+	token: VITE_AXIOM_TOKEN
+});
+
+const logger = createLogger({
+	level: 'info',
+	defaultMeta: { service: 'example-site' }, // Change this so you can identify your website if you have multiple logging into Axiom
+	format: format.combine(
+		format.errors({ stack: true }), // Captures error stack traces
+		format.timestamp(),
+		format.json() // Formats logs as JSON for structured logging
+	),
+	transports: [
+		new transports.Console({
+			format: format.combine(
+				format.colorize(),
+				format.printf(({ timestamp, level, message, stack }) => {
+					// Stack traces will be included in error messages automatically
+					return `${timestamp} [${level.toUpperCase()}]: ${message}${stack ? `\n${stack}` : ''}`;
+				})
+			)
+		}),
+		axiomTransport
+	],
+	exceptionHandlers: [axiomTransport], // Logs uncaught exceptions
+	rejectionHandlers: [axiomTransport] // Logs unhandled promise rejections
+});
+
+// Uncomment this for testing your initial logging setup
+logger.log({
+	level: 'info',
+	message: 'Logger successfully setup'
+});
+
+export default logger;