Do not include json file unless --resolveJsonModule is specified

Fixes #26402

src/compiler/diagnosticMessages.json

@@ -3941,6 +3941,10 @@
         "category": "Error",
         "code": 7041
     },
+    "Module '{0}' was resolved to '{1}', but '--resolveJsonModule' is not used.": {
+        "category": "Error",
+        "code": 7042
+    },
     "You cannot rename this element.": {
         "category": "Error",
         "code": 8000
@@ -4576,4 +4580,4 @@
      "category": "Message",
          "code": 95066
     }
-}
+}

src/compiler/program.ts

@@ -2849,7 +2849,6 @@ namespace ts {
         switch (extension) {
             case Extension.Ts:
             case Extension.Dts:
-            case Extension.Json: // Since module is resolved to json file only when --resolveJsonModule, we dont need further check
                 // These are always allowed.
                 return undefined;
             case Extension.Tsx:
@@ -2858,6 +2857,8 @@ namespace ts {
                 return needJsx() || needAllowJs();
             case Extension.Js:
                 return needAllowJs();
+            case Extension.Json:
+                return needResolveJsonModule();
         }
 
         function needJsx() {
@@ -2866,6 +2867,9 @@ namespace ts {
         function needAllowJs() {
             return options.allowJs || !getStrictOptionValue(options, "noImplicitAny") ? undefined : Diagnostics.Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type;
         }
+        function needResolveJsonModule() {
+            return options.resolveJsonModule ? undefined : Diagnostics.Module_0_was_resolved_to_1_but_resolveJsonModule_is_not_used;
+        }
     }
 
     function getModuleNames({ imports, moduleAugmentations }: SourceFile): string[] {