Better coverage config

Author: hans-lizihan

.gitignore

@@ -1,4 +1,5 @@
 node_modules
+coverage
 
 # ide files
 .idea

vitest.config.mjs

@@ -1,10 +1,16 @@
-import {defineConfig} from 'vitest/config';
+import {coverageConfigDefaults, defineConfig} from 'vitest/config';
 
 export default defineConfig({
   test: {
     globals: true,
     include: [
-      './test/**.js'
-    ]
+      'test/**.js'
+    ],
+    coverage: {
+      exclude: [
+        ...coverageConfigDefaults.exclude,
+        'example.js'
+      ]
+    }
   },
 })