Suppress noisy stderr output in test suite (#2665)

package.json

@@ -33,9 +33,9 @@
     "fmt:check": "npx oxfmt --check",
     "fmt": "npx oxfmt",
     "presubmit": "npm run fmt:check && npm run lint",
-    "test": "vitest run",
-    "test:watch": "vitest",
-    "test:ui": "vitest --ui",
+    "test": "cross-env NODE_OPTIONS=--no-deprecation VITE_CJS_IGNORE_WARNING=true vitest run",
+    "test:watch": "cross-env NODE_OPTIONS=--no-deprecation VITE_CJS_IGNORE_WARNING=true vitest",
+    "test:ui": "cross-env NODE_OPTIONS=--no-deprecation VITE_CJS_IGNORE_WARNING=true vitest --ui",
     "extract-codebase": "ts-node scripts/extract-codebase.ts",
     "init-precommit": "husky",
     "build": "npm run pre:e2e",

vitest.config.ts

@@ -8,6 +8,28 @@ export default defineConfig({
     environment: "happy-dom",
     include: ["src/**/*.{test,spec}.{ts,tsx}"],
     globals: true,
+    onConsoleLog(log, _type) {
+      // Suppress known noisy logs while allowing useful debugging output
+      const noisyPatterns = [
+        // Retry/flakiness logs from test utilities
+        /retry.*attempt/i,
+        /retrying/i,
+        // Settings-related noise during test setup
+        /failed to.*settings/i,
+        /settings.*error/i,
+        // Processor warnings that don't indicate real issues
+        /processor.*warning/i,
+        // Known test fixture console outputs (not real errors)
+        /\[test\]/i,
+      ];
+
+      for (const pattern of noisyPatterns) {
+        if (pattern.test(log)) {
+          return false;
+        }
+      }
+      // Allow all other console output (including errors) for debugging
+    },
   },
   resolve: {
     alias: {