Complete paired-room SSOT cleanup and logger singleton

src/logger.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it, vi } from 'vitest';
+
+describe('logger singleton', () => {
+  it('reuses the root logger and does not add duplicate process listeners across module reloads', async () => {
+    vi.resetModules();
+
+    const beforeUncaught = process.listeners('uncaughtException').length;
+    const beforeUnhandled = process.listeners('unhandledRejection').length;
+    const beforeExit = process.listeners('exit').length;
+
+    const first = await import('./logger.js');
+
+    const afterFirstUncaught = process.listeners('uncaughtException').length;
+    const afterFirstUnhandled = process.listeners('unhandledRejection').length;
+    const afterFirstExit = process.listeners('exit').length;
+
+    vi.resetModules();
+
+    const second = await import('./logger.js');
+
+    const afterSecondUncaught = process.listeners('uncaughtException').length;
+    const afterSecondUnhandled = process.listeners('unhandledRejection').length;
+    const afterSecondExit = process.listeners('exit').length;
+
+    expect(second.logger).toBe(first.logger);
+    expect(afterFirstUncaught).toBeGreaterThanOrEqual(beforeUncaught);
+    expect(afterFirstUnhandled).toBeGreaterThanOrEqual(beforeUnhandled);
+    expect(afterSecondUncaught).toBe(afterFirstUncaught);
+    expect(afterSecondUnhandled).toBe(afterFirstUnhandled);
+    expect(afterFirstExit).toBeGreaterThanOrEqual(beforeExit);
+    expect(afterSecondExit).toBe(afterFirstExit);
+  });
+});