Add SummaryReporter for vitest

Author: acelaya

README.md

@@ -48,3 +48,40 @@ describe('MyWidget', () => {
   });
 });
 ```
+
+## Vitest
+
+This package has an optional peer dependency on `vitest`. Any vitest-specific
+utility is exposed in a separate `@hypothesis/frontend-testing/vitest` entry
+point.
+
+### Summary reporter
+
+Vitest's default reporter prints a real-time summary indicating the test
+execution progress, but also a per-file list of tests at the end of every test
+file.
+
+This package provides a `SummaryReporter` that skips the per-file output, but
+still prints the real-time summary and details for any failed test.
+
+```js
+// vitest.config.js
+
+import { SummaryReporter } from '@hypothesis/frontend-testing/vitest';
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    browser: {
+      provider: 'playwright',
+      // ...
+    },
+
+    // Set the summary reporter here. You can define more reporters if desired
+    reporters: [new SummaryReporter()],
+
+    // Other config...
+  },
+});
+```

package.json

@@ -9,16 +9,35 @@
   "author": "Hypothesis Developers <[email protected]>",
   "license": "BSD-2-Clause",
   "packageManager": "[email protected]",
+  "exports": {
+    ".": {
+      "import": "./lib/index.js",
+      "types": "./lib/index.d.ts"
+    },
+    "./vitest": {
+      "import": "./lib/vitest.js",
+      "types": "./lib/vitest.d.ts"
+    }
+  },
   "devDependencies": {
     "@trivago/prettier-plugin-sort-imports": "^5.2.0",
     "prettier": "^3.0.3",
-    "typescript": "^5.2.2"
+    "typescript": "^5.2.2",
+    "vitest": "^3.1.2"
   },
   "dependencies": {
     "axe-core": "^4.8.2",
     "enzyme": "^3.11.0",
     "preact": "^10.18.1"
   },
+  "peerDependencies": {
+    "vitest": "^3.1.2"
+  },
+  "peerDependenciesMeta": {
+    "vitest": {
+      "optional": true
+    }
+  },
   "files": [
     "lib/**/*.js",
     "lib/**/*.d.ts"

src/vitest.ts

@@ -0,0 +1,11 @@
+import { DefaultReporter } from 'vitest/reporters';
+
+/**
+ * This reporter provides a real-time summary and reports errors in detail, but
+ * skips the individual file output.
+ */
+export class SummaryReporter extends DefaultReporter {
+  onTestModuleEnd() {
+    // Override this method to suppress individual file results
+  }
+}