first commit

src/core/logger.js

@@ -0,0 +1,16 @@
+import { config } from '../config.js';
+
+const LEVELS = { debug: 10, info: 20, warn: 30, error: 40 };
+const threshold = LEVELS[config.logLevel] ?? LEVELS.info;
+
+const write = (level, stream, args) => {
+  if (LEVELS[level] < threshold) return;
+  stream(`[${new Date().toISOString()}] ${level.toUpperCase()}`, ...args);
+};
+
+export const logger = {
+  debug: (...args) => write('debug', console.debug, args),
+  info: (...args) => write('info', console.info, args),
+  warn: (...args) => write('warn', console.warn, args),
+  error: (...args) => write('error', console.error, args),
+};