import _ from "lodash";

const nilMerge = (a: any, b: any): any => (_.isNil(a) ? b : a);

const nilMergeDeep = (a: any, b: any): any =>
  _.isObject(a) && !_.isArray(a)
    ? // recursively merge objects with nilMergeDeep customizer
      _.mergeWith({}, a, b, nilMergeDeep)
    : // use default customizer
      nilMerge(a, b);

export default nilMergeDeep;