microsoft · RyanCavanaugh · Jan 13, 2026 · Jan 13, 2026 · Jan 13, 2026 · Jan 13, 2026
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
@@ -4484,7 +4484,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
                 createDeprecatedDiagnostic("charset");
             }
             if (options.out) {
-                createDeprecatedDiagnostic("out", /*value*/ undefined, "outFile");
+                createDeprecatedDiagnostic("out");
             }
             if (options.importsNotUsedAsValues) {
                 createDeprecatedDiagnostic("importsNotUsedAsValues", /*value*/ undefined, "verbatimModuleSyntax");
@@ -4510,6 +4510,9 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
             if (options.allowSyntheticDefaultImports === false) {
                 createDeprecatedDiagnostic("allowSyntheticDefaultImports", "false", /*useInstead*/ undefined, /*related*/ undefined);
             }
+            if (options.outFile) {
+                createDeprecatedDiagnostic("outFile");
+            }
             if (options.module === ModuleKind.None || options.module === ModuleKind.AMD || options.module === ModuleKind.UMD || options.module === ModuleKind.System) {
                 createDeprecatedDiagnostic("module", ModuleKind[options.module], /*useInstead*/ undefined, /*related*/ undefined);
             }

diff --git a/tests/baselines/reference/alwaysStrictModule2.errors.txt b/tests/baselines/reference/alwaysStrictModule2.errors.txt
@@ -1,7 +1,9 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 a.ts(3,13): error TS1100: Invalid use of 'arguments' in strict mode.
 b.ts(3,13): error TS1100: Invalid use of 'arguments' in strict mode.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== a.ts (1 errors) ====
     namespace M {
         export function f() {

diff --git a/tests/baselines/reference/amdDeclarationEmitNoExtraDeclare.errors.txt b/tests/baselines/reference/amdDeclarationEmitNoExtraDeclare.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 !!! error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== Class.ts (0 errors) ====
     import { Configurable } from "./Configurable"

diff --git a/tests/baselines/reference/amdModuleBundleNoDuplicateDeclarationEmitComments.errors.txt b/tests/baselines/reference/amdModuleBundleNoDuplicateDeclarationEmitComments.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 !!! error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== file1.ts (0 errors) ====
     /// <amd-module name="mynamespace::SomeModuleA" />

diff --git a/tests/baselines/reference/blockScopedClassDeclarationAcrossFiles.errors.txt b/tests/baselines/reference/blockScopedClassDeclarationAcrossFiles.errors.txt
@@ -0,0 +1,9 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+
+
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+==== c.ts (0 errors) ====
+    let foo: typeof C;
+==== b.ts (0 errors) ====
+    class C { }
+
diff --git a/tests/baselines/reference/blockScopedNamespaceDifferentFile.errors.txt b/tests/baselines/reference/blockScopedNamespaceDifferentFile.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 !!! error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== test.ts (0 errors) ====
     namespace C {

diff --git a/tests/baselines/reference/bundledDtsLateExportRenaming.errors.txt b/tests/baselines/reference/bundledDtsLateExportRenaming.errors.txt
@@ -0,0 +1,30 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+
+
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+==== index.ts (0 errors) ====
+    export * from "./nested";
+
+==== nested/base.ts (0 errors) ====
+    import { B } from "./shared";
+
+    export function f() {
+        return new B();
+    }
+
+==== nested/derived.ts (0 errors) ====
+    import { f } from "./base";
+
+    export function g() {
+        return f();
+    }
+
+==== nested/index.ts (0 errors) ====
+    export * from "./base";
+
+    export * from "./derived";
+    export * from "./shared";
+
+==== nested/shared.ts (0 errors) ====
+    export class B {}
+
diff --git a/tests/baselines/reference/bundledDtsLateExportRenaming.js b/tests/baselines/reference/bundledDtsLateExportRenaming.js
@@ -49,34 +49,3 @@ declare module "nested/index" {
 declare module "index" {
     export * from "nested/index";
 }
-
-
-//// [DtsFileErrors]
-
-
-dist/out.d.ts(10,33): error TS2307: Cannot find module 'nested' or its corresponding type declarations.
-
-
-==== dist/out.d.ts (1 errors) ====
-    declare module "nested/shared" {
-        export class B {
-        }
-    }
-    declare module "nested/base" {
-        import { B } from "nested/shared";
-        export function f(): B;
-    }
-    declare module "nested/derived" {
-        export function g(): import("nested").B;
-                                    ~~~~~~~~
-!!! error TS2307: Cannot find module 'nested' or its corresponding type declarations.
-    }
-    declare module "nested/index" {
-        export * from "nested/base";
-        export * from "nested/derived";
-        export * from "nested/shared";
-    }
-    declare module "index" {
-        export * from "nested/index";
-    }
-
diff --git a/tests/baselines/reference/checkIndexConstraintOfJavascriptClassExpression.errors.txt b/tests/baselines/reference/checkIndexConstraintOfJavascriptClassExpression.errors.txt
@@ -1,8 +1,10 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 weird.js(1,1): error TS2552: Cannot find name 'someFunction'. Did you mean 'Function'?
 weird.js(1,23): error TS7006: Parameter 'BaseClass' implicitly has an 'any' type.
 weird.js(9,17): error TS7006: Parameter 'error' implicitly has an 'any' type.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== weird.js (3 errors) ====
     someFunction(function(BaseClass) {
     ~~~~~~~~~~~~

diff --git a/tests/baselines/reference/checkJsdocOnEndOfFile.errors.txt b/tests/baselines/reference/checkJsdocOnEndOfFile.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 eof.js(2,20): error TS2304: Cannot find name 'bad'.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== eof.js (1 errors) ====
     /**
      * @typedef {Array<bad>} Should have error here

diff --git a/tests/baselines/reference/checkJsdocReturnTag1.errors.txt b/tests/baselines/reference/checkJsdocReturnTag1.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 returns.js(20,12): error TS2872: This kind of expression is always truthy.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== returns.js (1 errors) ====
     // @ts-check
     /**

diff --git a/tests/baselines/reference/checkJsdocReturnTag2.errors.txt b/tests/baselines/reference/checkJsdocReturnTag2.errors.txt
@@ -1,9 +1,11 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 returns.js(6,5): error TS2322: Type 'number' is not assignable to type 'string'.
 returns.js(13,5): error TS2322: Type 'number | boolean' is not assignable to type 'string | number'.
   Type 'boolean' is not assignable to type 'string | number'.
 returns.js(13,12): error TS2872: This kind of expression is always truthy.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== returns.js (3 errors) ====
     // @ts-check
     /**

diff --git a/tests/baselines/reference/commonSourceDir5.errors.txt b/tests/baselines/reference/commonSourceDir5.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 error TS6082: Only 'amd' and 'system' modules are supported alongside --outFile.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 !!! error TS6082: Only 'amd' and 'system' modules are supported alongside --outFile.
 ==== A:/bar.ts (0 errors) ====
     import {z} from "./foo";

diff --git a/tests/baselines/reference/commonSourceDir6.errors.txt b/tests/baselines/reference/commonSourceDir6.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 !!! error TS5107: Option 'module=AMD' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== a/bar.ts (0 errors) ====
     import {z} from "./foo";

diff --git a/tests/baselines/reference/compilerOptionsOutAndNoEmit.errors.txt b/tests/baselines/reference/compilerOptionsOutAndNoEmit.errors.txt
@@ -0,0 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+
+
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+==== a.ts (0 errors) ====
+    class c {
+    }
+
diff --git a/tests/baselines/reference/compilerOptionsOutFileAndNoEmit.errors.txt b/tests/baselines/reference/compilerOptionsOutFileAndNoEmit.errors.txt
@@ -0,0 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+
+
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+==== a.ts (0 errors) ====
+    class c {
+    }
+
diff --git a/tests/baselines/reference/computedPropertyNames52(target=es2015).errors.txt b/tests/baselines/reference/computedPropertyNames52(target=es2015).errors.txt
@@ -0,0 +1,13 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+
+
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+==== computedPropertyNames52.js (0 errors) ====
+    const array = [];
+    for (let i = 0; i < 10; ++i) {
+        array.push(class C {
+            [i] = () => C;
+            static [i] = 100;
+        })
+    }
+
diff --git a/tests/baselines/reference/computedPropertyNames52(target=es5).errors.txt b/tests/baselines/reference/computedPropertyNames52(target=es5).errors.txt
@@ -0,0 +1,13 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+
+
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+==== computedPropertyNames52.js (0 errors) ====
+    const array = [];
+    for (let i = 0; i < 10; ++i) {
+        array.push(class C {
+            [i] = () => C;
+            static [i] = 100;
+        })
+    }
+
diff --git a/tests/baselines/reference/constDeclarations-useBeforeDefinition2.errors.txt b/tests/baselines/reference/constDeclarations-useBeforeDefinition2.errors.txt
@@ -1,6 +1,8 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 file1.ts(1,1): error TS2448: Block-scoped variable 'c' used before its declaration.
 
 
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
 ==== file1.ts (1 errors) ====
     c;
     ~

diff --git a/tests/baselines/reference/controlFlowJavascript.errors.txt b/tests/baselines/reference/controlFlowJavascript.errors.txt
@@ -0,0 +1,109 @@
+error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+
+
+!!! error TS5101: Option 'outFile' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
+==== controlFlowJavascript.js (0 errors) ====
+    let cond = true;
+
+    // CFA for 'let' and no initializer
+    function f1() {
+        let x;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | undefined
+    }
+
+    // CFA for 'let' and 'undefined' initializer
+    function f2() {
+        let x = undefined;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | undefined
+    }
+
+    // CFA for 'let' and 'null' initializer
+    function f3() {
+        let x = null;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | null
+    }
+
+    // CFA for 'var' with no initializer
+    function f5() {
+        var x;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | undefined
+    }
+
+    // CFA for 'var' with 'undefined' initializer
+    function f6() {
+        var x = undefined;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | undefined
+    }
+
+    // CFA for 'var' with 'null' initializer
+    function f7() {
+        var x = null;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | null
+    }
+
+    // No CFA for captured outer variables
+    function f9() {
+        let x;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | undefined
+        function f() {
+            const z = x;  // any
+        }
+    }
+
+    // No CFA for captured outer variables
+    function f10() {
+        let x;
+        if (cond) {
+            x = 1;
+        }
+        if (cond) {
+            x = "hello";
+        }
+        const y = x;  // string | number | undefined
+        const f = () => {
+            const z = x;  // any
+        };
+    }
+