Add eslint and refactor everything

logger.js

@@ -0,0 +1,23 @@
+const { createLogger, format, transports } = require('winston');
+const { combine, timestamp, printf } = format;
+
+const defaultFormat = printf(({ level, message, timestamp }) => {
+	return `${timestamp} ${level}: ${message}`;
+});
+const sessionFormat = printf(({ level, message, label, timestamp }) => {
+	return `${timestamp} [Session ${label}] ${level}: ${message}`;
+});
+function createBaseLogger() {
+	return createLogger({
+		format: combine(format.colorize({ all: true }), timestamp(), defaultFormat),
+		transports: [new transports.Console()],
+	});
+}
+function createSessionLogger(label) {
+	return createLogger({
+		format: combine(label({ label: label }), format.colorize({ all: true }), timestamp(), sessionFormat),
+		transports: [new transports.Console()],
+	});
+}
+
+module.exports = { createBaseLogger, createSessionLogger };