docs: add onConsoleLog (#4115)

docs/config/index.md

@@ -1619,3 +1619,26 @@ By default Vitest will run all of your test cases even if some of them fail. Thi
 - **Version:** Since Vitest 0.32.3
 
 Retry the test specific number of times if it fails.
+
+### onConsoleLog
+
+- **Type**: `(log: string, type: 'stdout' | 'stderr') => false | void`
+
+Custom handler for `console.log` in tests. If you return `false`, Vitest will not print the log to the console.
+
+Can be useful for filtering out logs from third-party libraries.
+
+```ts
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    onConsoleLog(log: string, type: 'stdout' | 'stderr'): boolean | void {
+      if (log === 'message from third party library' && type === 'stdout') {
+        return false;
+      }
+    },
+  },
+})
+```
+