code: function getLayoutName(file, options) {
    const defaultLayout = options.defaultLayout;
    const prop = options.layoutProp || 'layout';
    const name = file[prop];
    if (typeof name === 'undefined' || name === true || name === defaultLayout) {
      return defaultLayout;
    }
    if (!name || ['false', 'null', 'nil', 'none', 'undefined'].includes(name.toLowerCase())) {
      return false;
    }
    return name;
  }
docs: Get the name of the layout to use.
  @param  {Object} `file`
  @param  {Object} `options`
  @return {String|Null} Returns the name of the layout to use or `false`