pre() {
      // $FlowFixMe[object-this-reference] Babel transforms run with the plugin context by default
      const visitor = this;
      const pluginOptions: PluginOptions = visitor.opts;
      pluginOptions.fbtBase64 = pluginOptions.fbtBase64;

      FbtCommon.init(pluginOptions);
      FbtEnumRegistrar.setEnumManifest(getEnumManifest(pluginOptions));
      initExtraOptions(visitor);
      initDefaultOptions(visitor);
      allMetaPhrases = [];
      childToParent = {};
    }
An array containing the child to parent relationships for implicit nodes.