Merge pull request #5188 from NativeScript/bektchiev/warn-missing-modulemap

fix: Add warning for missing modulemap in `src`

Author: mbektchiev

lib/services/ios-project-service.ts

@@ -646,6 +646,9 @@ export class IOSProjectService extends projectServiceBaseLib.PlatformProjectServ
 		const group = this.getRootGroup(groupName, sourceFolderPath);
 		project.addPbxGroup(group.files, group.name, group.path, null, { isMain: true, filesRelativeToProject: true });
 		project.addToHeaderSearchPaths(group.path);
+		if (!this.$fs.exists(path.join(sourceFolderPath, "module.modulemap"))) {
+			this.$logger.warn(`warning: Directory ${sourceFolderPath} with native iOS source code doesn't contain a modulemap file. Metadata for it will not be generated and it will not be accessible from JavaScript. To learn more see https://docs.nativescript.org/guides/ios-source-code`);
+		}
 		this.savePbxProj(project, projectData);
 	}