implement pino poc

tests/logger.test.ts

@@ -0,0 +1,45 @@
+import { Writable } from 'node:stream'
+import pino from 'pino'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { createLogger } from '../src/components/logger.js'
+
+describe('Pino logger', () => {
+    let output = ''
+    const destination = new Writable({
+        write(chunk, _encoding, callback) {
+            output += chunk.toString()
+            callback()
+        }
+    })
+    const parentLogger = pino({ level: 'trace' }, destination)
+
+    beforeEach(() => {
+        vi.stubEnv('NODE_ENV', 'test')
+    })
+
+    afterEach(() => {
+        vi.unstubAllEnvs()
+    })
+
+    it('creates a child logger with component and caller metadata', () => {
+        output = ''
+        const logger = createLogger({ component: 'test' }, parentLogger)
+        logger.info('bound message')
+
+        const entry = JSON.parse(output)
+        expect(entry.msg).toBe('bound message')
+        expect(entry.component).toBe('test')
+        expect(entry.caller).toMatch(/logger\.test\.ts:\d+:\d+/)
+    })
+
+    it('supports native Pino levels and structured log fields', () => {
+        output = ''
+        const logger = createLogger({ component: 'test' }, parentLogger)
+        logger.warn({ answer: 42 }, 'warning')
+
+        const entry = JSON.parse(output)
+        expect(entry.level).toBe(40)
+        expect(entry.answer).toBe(42)
+        expect(entry.msg).toBe('warning')
+    })
+})