From be4b2f32e520e993b8ab1d1e7e8c30876542b00e Mon Sep 17 00:00:00 2001
From: Emanuel Hoogeveen <emanuel@medweb.nl>
Date: Tue, 14 May 2024 17:27:28 +0200
Subject: [PATCH 1/2] fix(typescript-estree): don't add in-project files to
 defaultProjectMatchedFiles

Only add path to defaultProjectMatchedFiles if opened.configFileName is falsy.
---
 .../typescript-estree/src/useProgramFromProjectService.ts     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/typescript-estree/src/useProgramFromProjectService.ts b/packages/typescript-estree/src/useProgramFromProjectService.ts
index 8f18b08ed788..9cdfc52107ad 100644
--- a/packages/typescript-estree/src/useProgramFromProjectService.ts
+++ b/packages/typescript-estree/src/useProgramFromProjectService.ts
@@ -83,7 +83,9 @@ export function useProgramFromProjectService(
     return undefined;
   }
 
-  defaultProjectMatchedFiles.add(filePathAbsolute);
+  if (!opened.configFileName) {
+    defaultProjectMatchedFiles.add(filePathAbsolute);
+  }
   if (defaultProjectMatchedFiles.size > maximumDefaultProjectFileMatchCount) {
     throw new Error(
       `Too many files (>${maximumDefaultProjectFileMatchCount}) have matched the default project.${DEFAULT_PROJECT_FILES_ERROR_EXPLANATION}

From 449d30e812f367cec83c490dfea4134265291d49 Mon Sep 17 00:00:00 2001
From: Emanuel Hoogeveen <emanuel@medweb.nl>
Date: Wed, 15 May 2024 20:25:21 +0200
Subject: [PATCH 2/2] test(typescript-estree): add additional unit test for
 project service

Ensure it does not throw for in-project files
---
 .../lib/useProgramFromProjectService.test.ts  | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/packages/typescript-estree/tests/lib/useProgramFromProjectService.test.ts b/packages/typescript-estree/tests/lib/useProgramFromProjectService.test.ts
index 5b4a9b8cabba..26989c8779fc 100644
--- a/packages/typescript-estree/tests/lib/useProgramFromProjectService.test.ts
+++ b/packages/typescript-estree/tests/lib/useProgramFromProjectService.test.ts
@@ -220,4 +220,29 @@ If you absolutely need more files included, set parserOptions.EXPERIMENTAL_usePr
 
     expect(actual).toBe(program);
   });
+
+  it('returns a created program when hasFullTypeInformation is disabled, the file is in the project service, the service has a matching program, and no out-of-project files are allowed', () => {
+    const { service } = createMockProjectService();
+    const program = { getSourceFile: jest.fn() };
+
+    mockGetProgram.mockReturnValueOnce(program);
+
+    service.openClientFile.mockReturnValueOnce({
+      configFileName: 'tsconfig.json',
+    });
+    mockCreateProjectProgram.mockReturnValueOnce(program);
+
+    const actual = useProgramFromProjectService(
+      createProjectServiceSettings({
+        allowDefaultProjectForFiles: [],
+        maximumDefaultProjectFileMatchCount: 0,
+        service,
+      }),
+      mockParseSettings,
+      false,
+      new Set(),
+    );
+
+    expect(actual).toBe(program);
+  });
 });