fix(typecheck): fix suite collection while-loop (#5065)

packages/vitest/src/typecheck/collect.ts

@@ -99,9 +99,8 @@ export async function collectTests(ctx: WorkspaceProject, filepath: string): Pro
   })
   let lastSuite: ParsedSuite = file
   const updateLatestSuite = (index: number) => {
-    const suite = lastSuite
-    while (lastSuite !== file && lastSuite.end < index)
-      lastSuite = suite.suite as ParsedSuite
+    while (lastSuite.suite && lastSuite.end < index)
+      lastSuite = lastSuite.suite as ParsedSuite
     return lastSuite
   }
   definitions.sort((a, b) => a.start - b.start).forEach((definition) => {

test/typescript/test-d/nested-suite1.test-d.ts

@@ -0,0 +1,11 @@
+import { describe, test } from 'vitest'
+
+describe('suite-A', () => {
+  describe('suite-B', () => {
+    test('case-X', () => {
+    })
+  })
+})
+
+test('case-Y', () => {
+})

test/typescript/test-d/nested-suite2.test-d.ts

@@ -0,0 +1,18 @@
+import { describe, test } from 'vitest'
+
+describe('suite-A', () => {
+  describe('suite-B', () => {
+    test('case-X', () => {
+    })
+
+    describe('suite-C', () => {
+      test('case-Y', () => {
+      })
+    })
+  })
+
+  describe('suite-D', () => {
+    test('case-Z', () => {
+    })
+  })
+})