message: Fix type mismatch arising from conversion to ReadonlyArray.
diff: @@ -60,7 +60,7 @@ suite('Class', () => {
  privacy: string,
  properties?: any[],
  methods?: any[],
  - warnings?: string[],
  + warnings?: ReadonlyArray<string>,
  mixins?: any[],
  superClass?: string,
  };
  