readSchema method
Implementation
Future<String> readSchema(BuildStep buildStep) async {
final inputAssets = await buildStep.findAssets(inputFiles).toList();
final inputAssets2 = await buildStep.findAssets(inputFiles2).toList();
inputAssets.addAll(inputAssets2);
final contents = await Future.wait(
inputAssets.map((asset) => buildStep.readAsString(asset)));
final schema = contents.join("\n");
return schema;
}