SYMBOL INDEX (6 symbols across 2 files)

FILE: index.d.ts
  type Options (line 6) | interface Options {
  type Tree (line 13) | type Tree<T> = T & {

FILE: index.js
  function createTree (line 5) | function createTree(array, rootNodes, customID, childrenProperty) {
  function groupByParents (line 31) | function groupByParents(array, options) {
  function isObject (line 50) | function isObject(o) {
  function deepClone (line 54) | function deepClone(data) {