microsoft · Twacqwq · Nov 22, 2025 · Nov 26, 2025 · Nov 26, 2025 · Nov 26, 2025
diff --git a/internal/compiler/program.go b/internal/compiler/program.go
@@ -634,6 +634,10 @@ func (p *Program) verifyCompilerOptions() {
 		}
 	}
 
+	if options.TsBuildInfoFile == "" && options.Incremental.IsTrue() && options.ConfigFilePath == "" {
+		createCompilerOptionsDiagnostic(diagnostics.Option_incremental_is_only_valid_with_a_known_configuration_file_like_tsconfig_json_or_when_tsBuildInfoFile_is_explicitly_provided)
+	}
+
 	p.verifyProjectReferences()
 
 	if options.Composite.IsTrue() {

diff --git a/internal/diagnostics/diagnostics_generated.go b/internal/diagnostics/diagnostics_generated.go
diff --git a/internal/diagnostics/extraDiagnosticMessages.json b/internal/diagnostics/extraDiagnosticMessages.json
@@ -54,5 +54,9 @@
     "tsconfig.json is present but will not be loaded if files are specified on commandline. Use '--ignoreConfig' to skip this error.": {
         "category": "Error",
         "code": 5112
+    },
+    "Option '--incremental' is only valid with a known configuration file (like 'tsconfig.json') or when '--tsBuildInfoFile' is explicitly provided.": {
+        "category": "Error",
+        "code": 5074
     }
 }
diff --git a/internal/diagnostics/loc/cs-CZ.json.gz b/internal/diagnostics/loc/cs-CZ.json.gz
diff --git a/internal/diagnostics/loc/de-DE.json.gz b/internal/diagnostics/loc/de-DE.json.gz
diff --git a/internal/diagnostics/loc/es-ES.json.gz b/internal/diagnostics/loc/es-ES.json.gz
diff --git a/internal/diagnostics/loc/fr-FR.json.gz b/internal/diagnostics/loc/fr-FR.json.gz
diff --git a/internal/diagnostics/loc/it-IT.json.gz b/internal/diagnostics/loc/it-IT.json.gz
diff --git a/internal/diagnostics/loc/ja-JP.json.gz b/internal/diagnostics/loc/ja-JP.json.gz
diff --git a/internal/diagnostics/loc/ko-KR.json.gz b/internal/diagnostics/loc/ko-KR.json.gz
diff --git a/internal/diagnostics/loc/pl-PL.json.gz b/internal/diagnostics/loc/pl-PL.json.gz
diff --git a/internal/diagnostics/loc/pt-BR.json.gz b/internal/diagnostics/loc/pt-BR.json.gz
diff --git a/internal/diagnostics/loc/ru-RU.json.gz b/internal/diagnostics/loc/ru-RU.json.gz
diff --git a/internal/diagnostics/loc/tr-TR.json.gz b/internal/diagnostics/loc/tr-TR.json.gz
diff --git a/internal/diagnostics/loc/zh-CN.json.gz b/internal/diagnostics/loc/zh-CN.json.gz
diff --git a/internal/diagnostics/loc/zh-TW.json.gz b/internal/diagnostics/loc/zh-TW.json.gz
diff --git a/testdata/baselines/reference/submodule/compiler/incrementalInvalid.errors.txt b/testdata/baselines/reference/submodule/compiler/incrementalInvalid.errors.txt
@@ -0,0 +1,8 @@
+error TS5074: Option '--incremental' is only valid with a known configuration file (like 'tsconfig.json') or when '--tsBuildInfoFile' is explicitly provided.
+
+
+!!! error TS5074: Option '--incremental' is only valid with a known configuration file (like 'tsconfig.json') or when '--tsBuildInfoFile' is explicitly provided.
+==== incrementalInvalid.ts (0 errors) ====
+    const x = 10;
+
+
diff --git a/testdata/baselines/reference/submodule/compiler/incrementalInvalid.errors.txt.diff b/testdata/baselines/reference/submodule/compiler/incrementalInvalid.errors.txt.diff
@@ -5,8 +5,10 @@
 -
 -
 -!!! error TS5074: Option '--incremental' can only be specified using tsconfig, emitting to single file or when option '--tsBuildInfoFile' is specified.
--==== incrementalInvalid.ts (0 errors) ====
--    const x = 10;
--    
--    
-+<no content>
++error TS5074: Option '--incremental' is only valid with a known configuration file (like 'tsconfig.json') or when '--tsBuildInfoFile' is explicitly provided.
++
++
++!!! error TS5074: Option '--incremental' is only valid with a known configuration file (like 'tsconfig.json') or when '--tsBuildInfoFile' is explicitly provided.
+ ==== incrementalInvalid.ts (0 errors) ====
+     const x = 10;
+