transform a deep object tree

deepTransform.ts

import _ from 'lodash'


// accumulator, value, key, object)

export const transformDeep = (root: object, iteratee: (accumulator: object, nodeOrLeaf: any, key: string, parent: object) => void): object => {
  const deepIteratee = (deepAccumulator: object, deepNodeOrLeaf: any, deepKey: string, deepParent: object): void => {
    iteratee(deepAccumulator, deepNodeOrLeaf, deepKey, deepParent) //run potential mutation

    if (_.isPlainObject(deepNodeOrLeaf) || _.isArray(deepNodeOrLeaf)) { // run deep (maybe shouldRunDeep with eq check?)
      (deepAccumulator as any)[deepKey] = transformDeep(deepNodeOrLeaf, iteratee)
    }
  }

  return _.transform(root, deepIteratee)
}