Add allowUmdGlobalAccess flag

src/compiler/commandLineParser.ts

@@ -603,6 +603,12 @@ namespace ts {
             category: Diagnostics.Source_Map_Options,
             description: Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
         },
+        {
+            name: "allowUmdGlobalAccess",
+            type: "boolean",
+            category: Diagnostics.Module_Resolution_Options,
+            description: Diagnostics.Allow_accessing_UMD_globals_from_modules,
+        },
 
         // Experimental
         {

src/compiler/diagnosticMessages.json

@@ -4938,5 +4938,9 @@
     "Convert parameters to destructured object": {
         "category": "Message",
         "code": 95075
+    },
+    "Allow accessing UMD globals from modules": {
+        "category": "Message",
+        "code": 95076
     }
 }

src/compiler/types.ts

@@ -4580,6 +4580,7 @@ namespace ts {
         allowJs?: boolean;
         /*@internal*/ allowNonTsExtensions?: boolean;
         allowSyntheticDefaultImports?: boolean;
+        allowUmdGlobalAccess?: boolean;
         allowUnreachableCode?: boolean;
         allowUnusedLabels?: boolean;
         alwaysStrict?: boolean;  // Always combine with strict property