message: Add cast to language service.
diff: @@ -21,7 +21,7 @@ interface Options {
  logToFile?: string;
  }
  -const options = commandLineArgs(optionDescriptors, {});
  +const options = commandLineArgs(optionDescriptors, {}) as Options;
  /**
  * Implements the [language server protocol][1] v3.0 for Web Components and
  