mapValuesDeep with circular references detection

mapValuesDeep.js

// based on vanilla lodash, todo: rewrite with lodash/fp
// uses isPlainObject to detect ojbects to go deep into
// detects circular references using Set()

function mapValuesDeep(originalObj, mapFunc) {
  const visitedObjects = new Set()

  const mapValues = (originalObj, mapFunc) =>
    _.mapValues(originalObj, value => {
      if (_.isPlainObject(value)) {
        // detecting circular references
        if (visitedObjects.has(value)) {
          return value
        }

        visitedObjects.add(value)
        return mapValues(value, mapFunc)
      }

      return mapFunc(value)
    })

  return mapValues(originalObj, mapFunc)
}