From c7a06499c3da6cea5bb54df0d43062d46e47d028 Mon Sep 17 00:00:00 2001
From: MaheshDesu <mahesh.desu3@gmail.com>
Date: Mon, 12 Oct 2026 17:16:03 +0530
Subject: [PATCH] Fix broken augmentExportEquals2 test fixture

The fixture had a consecutive duplicate `// @filename: file3.ts`
directive, which caused the test harness to save an empty file3.ts
unit and wipe the content-bearing one. The test silently expected
zero errors instead of the classic TS2671 + TS2503 diagnostics.

Removing the duplicate line restores the expected behavior, matching
the classic 5.9/6.0 baselines exactly.

Refs #63814.

Signed-off-by: MaheshDesu <mahesh.desu3@gmail.com>
---
 .../compiler/augmentExportEquals2.errors.txt  | 24 +++++++++++++++++
 .../compiler/augmentExportEquals2.js          | 12 +++++++--
 .../compiler/augmentExportEquals2.symbols     | 27 +++++++++++++++++--
 .../compiler/augmentExportEquals2.types       | 25 +++++++++++++++--
 .../cases/compiler/augmentExportEquals2.ts    |  1 -
 5 files changed, 82 insertions(+), 7 deletions(-)
 create mode 100644 tsc/testdata/baselines/reference/compiler/augmentExportEquals2.errors.txt

diff --git a/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.errors.txt b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.errors.txt
new file mode 100644
index 0000000000000..cfda8b47dd1ab
--- /dev/null
+++ b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.errors.txt
@@ -0,0 +1,24 @@
+file2.ts(4,16): error TS2671: Cannot augment module './file1' because it resolves to a non-module entity.
+file3.ts(3,8): error TS2503: Cannot find namespace 'x'.
+
+
+==== file3.ts (1 errors) ====
+    import x = require("./file1");
+    import "./file2";
+    let a: x.A; // should not work
+           ~
+!!! error TS2503: Cannot find namespace 'x'.
+==== file1.ts (0 errors) ====
+    function foo() {}
+    export = foo;
+    
+==== file2.ts (1 errors) ====
+    import x = require("./file1"); 
+    
+    // should error since './file1' does not have namespace meaning
+    declare module "./file1" {
+                   ~~~~~~~~~
+!!! error TS2671: Cannot augment module './file1' because it resolves to a non-module entity.
+        interface A { a }
+    }
+    
\ No newline at end of file
diff --git a/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.js b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.js
index cab4b9fb56ff9..30c796d8365ae 100644
--- a/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.js
+++ b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.js
@@ -12,12 +12,20 @@ declare module "./file1" {
     interface A { a }
 }
 
-//// [file3.ts]
-
 //// [file3.ts]
 import x = require("./file1");
 import "./file2";
 let a: x.A; // should not work
 
+//// [file1.js]
+"use strict";
+function foo() { }
+module.exports = foo;
+//// [file2.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 //// [file3.js]
 "use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+require("./file2");
+let a; // should not work
diff --git a/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.symbols b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.symbols
index 1f758cf8e600d..3a47af235c0bc 100644
--- a/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.symbols
+++ b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.symbols
@@ -1,9 +1,32 @@
 //// [tests/cases/compiler/augmentExportEquals2.ts] ////
 
 === file3.ts ===
-
 import x = require("./file1");
+>x : Symbol(x, Decl(file3.ts, 0, 0))
+
 import "./file2";
 let a: x.A; // should not work
-=== file3.ts ===
+>a : Symbol(a, Decl(file3.ts, 2, 3))
+>x : Symbol(x)
+>A : Symbol(x.A)
+
+=== file1.ts ===
+function foo() {}
+>foo : Symbol(foo, Decl(file1.ts, 0, 0))
+
+export = foo;
+>foo : Symbol(foo, Decl(file1.ts, 0, 0))
+
+=== file2.ts ===
+import x = require("./file1"); 
+>x : Symbol(x, Decl(file2.ts, 0, 0))
+
+// should error since './file1' does not have namespace meaning
+declare module "./file1" {
+>"./file1" : Symbol("./file1", Decl(file2.ts, 0, 30))
+
+    interface A { a }
+>A : Symbol(A, Decl(file2.ts, 3, 26))
+>a : Symbol(A.a, Decl(file2.ts, 4, 17))
+}
 
diff --git a/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.types b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.types
index 1f758cf8e600d..a428d630e6c7a 100644
--- a/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.types
+++ b/tsc/testdata/baselines/reference/compiler/augmentExportEquals2.types
@@ -1,9 +1,30 @@
 //// [tests/cases/compiler/augmentExportEquals2.ts] ////
 
 === file3.ts ===
-
 import x = require("./file1");
+>x : () => void
+
 import "./file2";
 let a: x.A; // should not work
-=== file3.ts ===
+>a : x.A
+>x : any
+
+=== file1.ts ===
+function foo() {}
+>foo : () => void
+
+export = foo;
+>foo : () => void
+
+=== file2.ts ===
+import x = require("./file1"); 
+>x : () => void
+
+// should error since './file1' does not have namespace meaning
+declare module "./file1" {
+>"./file1" : any
+
+    interface A { a }
+>a : any
+}
 
diff --git a/tsc/testdata/tests/cases/compiler/augmentExportEquals2.ts b/tsc/testdata/tests/cases/compiler/augmentExportEquals2.ts
index edf529992dcfb..12bb857e2658c 100644
--- a/tsc/testdata/tests/cases/compiler/augmentExportEquals2.ts
+++ b/tsc/testdata/tests/cases/compiler/augmentExportEquals2.ts
@@ -14,7 +14,6 @@ declare module "./file1" {
     interface A { a }
 }
 
-// @filename: file3.ts
 // @filename: file3.ts
 import x = require("./file1");
 import "./file2";