Method _pluginIndex

src/core.js:378–387

(name)

  }

  _pluginIndex(name) {
    let index = -1;
    this.plugins.some(function(plugin, i) {
      if (plugin.name === name) {
        index = i;
        return true;
      }
    });
    return index;
  }

  /**
   * @param {Node} ast