message: use const instead of let in variant files iteration
diff: @@ -194,7 +194,7 @@ export class VariantManager implements vscode.Disposable {
  }
  } else {
  // iterate on the json files
  - for (let json_file of json_files) {
  + for (const json_file of json_files) {
  if (await async.exists(json_file)) {
  const content = (await async.readFile(json_file)).toString();
  try {
  