Use getEmitModuleKind for referenced project options

Co-authored-by: andrewbranch <[email protected]>

Author: Copilot

src/compiler/checker.ts

@@ -3824,7 +3824,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                     }
                     // If the referenced project's module format is ESM (ES2015 or later),
                     // it cannot have a synthetic default
-                    const referencedModuleKind = referencedOptions.module ?? ModuleKind.CommonJS;
+                    const referencedModuleKind = getEmitModuleKind(referencedOptions);
                     if (referencedModuleKind >= ModuleKind.ES2015) {
                         return false;
                     }