feat: add logger package to improve observability

packages/logger/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "@kan/logger",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./src/index.ts"
+    }
+  },
+  "license": "GPL-3.0",
+  "scripts": {
+    "build": "tsc",
+    "clean": "git clean -xdf .cache .turbo dist node_modules",
+    "dev": "tsc",
+    "format": "prettier --check . --ignore-path ../../.gitignore",
+    "lint": "eslint",
+    "typecheck": "tsc --noEmit --emitDeclarationOnly false"
+  },
+  "dependencies": {
+    "pino": "^9.14.0",
+    "pino-pretty": "^13.1.3"
+  },
+  "devDependencies": {
+    "@kan/eslint-config": "workspace:*",
+    "@kan/prettier-config": "workspace:*",
+    "@kan/tsconfig": "workspace:*",
+    "eslint": "catalog:",
+    "prettier": "catalog:",
+    "typescript": "catalog:"
+  },
+  "prettier": "@kan/prettier-config"
+}

packages/logger/src/index.ts

@@ -0,0 +1,20 @@
+import pino from "pino";
+
+const isDev = process.env.NODE_ENV !== "production";
+const level = process.env.LOG_LEVEL ?? (isDev ? "debug" : "info");
+
+export const logger = pino({
+  level,
+  ...(isDev && {
+    transport: {
+      target: "pino-pretty",
+      options: {
+        colorize: true,
+        ignore: "pid,hostname",
+        translateTime: "HH:MM:ss",
+      },
+    },
+  }),
+});
+
+export const createLogger = (module: string) => logger.child({ module });

packages/logger/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "extends": "@kan/tsconfig/internal-package.json",
+  "compilerOptions": {},
+  "include": ["*.ts", "src"],
+  "exclude": ["node_modules"]
+}