nl_tokens: Add a hierarchical facet to the hierarchicalFacets attribute of the helper configuration .
pl_tokens: function addHierarchicalFacet ( hierarchicalFacet ) { if ( this . isHierarchicalFacet ( hierarchicalFacet . <mask> ) ) { throw new Error ( 'Cannot declare two hierarchical facets with the same name: `' + hierarchicalFacet . name + '`' ) ; } return this . setQueryParameters ( { hierarchicalFacets : this . hierarchicalFacets . concat ( [ hierarchicalFacet ] ) } ) ; }