diff --git a/packages/browser/src/node/plugin.ts b/packages/browser/src/node/plugin.ts
index 73f43899d760..8bab85816f3a 100644
--- a/packages/browser/src/node/plugin.ts
+++ b/packages/browser/src/node/plugin.ts
@@ -364,7 +364,7 @@ export default (parentServer: ParentBrowserProject, base = '/'): Plugin[] => {
       name: 'vitest:browser:in-source-tests',
       transform(code, id) {
         const project = parentServer.vitest.getProjectByName(parentServer.config.name)
-        if (!project.isCachedTestFile(id) || !code.includes('import.meta.vitest')) {
+        if (!project._isCachedTestFile(id) || !code.includes('import.meta.vitest')) {
           return
         }
         const s = new MagicString(code, { filename: cleanUrl(id) })
diff --git a/packages/vitest/src/node/project.ts b/packages/vitest/src/node/project.ts
index 1e156da24c5c..eeb6b977e726 100644
--- a/packages/vitest/src/node/project.ts
+++ b/packages/vitest/src/node/project.ts
@@ -394,7 +394,7 @@ export class TestProject {
    * Returns if the file is a test file. Requires `.globTestFiles()` to be called first.
    * @internal
    */
-  isCachedTestFile(testPath: string): boolean {
+  _isCachedTestFile(testPath: string): boolean {
     return !!this.testFilesList && this.testFilesList.includes(testPath)
   }
 
@@ -402,7 +402,7 @@ export class TestProject {
    * Returns if the file is a typecheck test file. Requires `.globTestFiles()` to be called first.
    * @internal
    */
-  isCachedTypecheckFile(testPath: string): boolean {
+  _isCachedTypecheckFile(testPath: string): boolean {
     return !!this.typecheckFilesList && this.typecheckFilesList.includes(testPath)
   }
 
@@ -430,7 +430,7 @@ export class TestProject {
    * Test if a file matches the test globs. This does the actual glob matching if the test is not cached, unlike `isCachedTestFile`.
    */
   public matchesTestGlob(moduleId: string, source?: () => string): boolean {
-    if (this.isCachedTestFile(moduleId)) {
+    if (this._isCachedTestFile(moduleId)) {
       return true
     }
     const relativeId = relative(this.config.dir || this.config.root, moduleId)
diff --git a/packages/vitest/src/node/specifications.ts b/packages/vitest/src/node/specifications.ts
index 346300718006..e57d79ce9ba1 100644
--- a/packages/vitest/src/node/specifications.ts
+++ b/packages/vitest/src/node/specifications.ts
@@ -21,10 +21,10 @@ export class VitestSpecifications {
 
     const specs: TestSpecification[] = []
     for (const project of this.vitest.projects) {
-      if (project.isCachedTestFile(moduleId)) {
+      if (project._isCachedTestFile(moduleId)) {
         specs.push(project.createSpecification(moduleId))
       }
-      if (project.isCachedTypecheckFile(moduleId)) {
+      if (project._isCachedTypecheckFile(moduleId)) {
         specs.push(project.createSpecification(moduleId, [], 'typescript'))
       }
     }
diff --git a/packages/vitest/src/node/watcher.ts b/packages/vitest/src/node/watcher.ts
index 4d721e91c283..0db9f78649e1 100644
--- a/packages/vitest/src/node/watcher.ts
+++ b/packages/vitest/src/node/watcher.ts
@@ -123,7 +123,7 @@ export class VitestWatcher {
     if (!projects.length) {
       // if there are no modules it's possible that server was restarted
       // we don't have information about importers anymore, so let's check if the file is a test file at least
-      if (this.vitest.state.filesMap.has(filepath) || this.vitest.projects.some(project => project.isCachedTestFile(filepath))) {
+      if (this.vitest.state.filesMap.has(filepath) || this.vitest.projects.some(project => project._isCachedTestFile(filepath))) {
         this.changedTests.add(filepath)
         return true
       }
@@ -142,7 +142,7 @@ export class VitestWatcher {
       this.invalidates.add(filepath)
 
       // one of test files that we already run, or one of test files that we can run
-      if (this.vitest.state.filesMap.has(filepath) || project.isCachedTestFile(filepath)) {
+      if (this.vitest.state.filesMap.has(filepath) || project._isCachedTestFile(filepath)) {
         this.changedTests.add(filepath)
         files.push(filepath)
         continue