Function enterSubtree

test/fixtures/snapshot/typescript.js:96543–96547

* Sets the `HierarchyFacts` for this node prior to visiting this node's subtree, returning the facts set prior to modification. * @param excludeFacts The existing `HierarchyFacts` to reset before visiting the subtree. * @param includeFacts The new `HierarchyFacts` to set before vis

(excludeFacts, includeFacts)

         * @param includeFacts The new `HierarchyFacts` to set before visiting the subtree.
         */
        function enterSubtree(excludeFacts, includeFacts) {
            var ancestorFacts = hierarchyFacts;
            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & 3 /* HierarchyFacts.AncestorFactsMask */;
            return ancestorFacts;
        }
        /**
         * Restores the `HierarchyFacts` for this node's ancestor after visiting this node's
         * subtree.