feat: use vitest controlled api-snapshot

test/__snapshots__/tsnapi/pkg-placeholder/index.snapshot.d.ts

@@ -0,0 +1,7 @@
+/**
+ * Generated by tsnapi — public API snapshot of `pkg-placeholder`
+ */
+// #region Variables
+export declare const one: number;
+export declare const two: number;
+// #endregion

test/__snapshots__/tsnapi/pkg-placeholder/index.snapshot.js

@@ -0,0 +1,7 @@
+/**
+ * Generated by tsnapi — public API snapshot of `pkg-placeholder`
+ */
+// #region Variables
+export var one /* const */
+export var two /* const */
+// #endregion

test/api-snapshot.test.ts

@@ -0,0 +1,14 @@
+import { fileURLToPath } from 'node:url'
+import { guardStaleBuild } from 'tsdown-stale-guard'
+import { snapshotApiPerEntry } from 'tsnapi/vitest'
+import { beforeAll, describe } from 'vitest'
+
+const root = fileURLToPath(new URL('..', import.meta.url))
+
+describe('api snapshot', () => {
+  beforeAll(async () => {
+    await guardStaleBuild({ root })
+  })
+
+  snapshotApiPerEntry(root)
+})

test/index.test.ts

@@ -1,7 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-describe('should', () => {
-  it('exported', () => {
-    expect(1).toEqual(1)
-  })
-})