const defaultIsMatchFn = val => val === null || val === undefined || val === ''

export function clearObject(obj, isMatchFn = defaultIsMatchFn) {
  if (isMatchFn(obj)) return null

  if (typeof obj === 'object') {
    const initial = obj instanceof Array ? [] : {}

    const result = Object.keys(obj).reduce((acc, key) => {
      const value = clearObject(obj[key])
      return Object.assign(initial, acc, defaultIsMatchFn(value) ? {} : { [key]: value })
    }, initial)

    return Object.keys(result).length ? result : null
  }
  return obj
}