* @returns {SortableProperty} The current property that is being sorted on. Undefined if no sort order is applied.

* Called with a type definition and a React component node path, `processComponentDeclaration` translates that definition * to an AST of PropType.* c

* Sorts the items passed in and returns a newly sorted array. * @param items {Array.<Object>} * @returns {Array.<Object>} sorted array of items,

* Updates the sort property, potentially flipping the sort order based on whether the same * property was already being sorted. * @param propert