"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.merge = merge;
var _lodash = require("lodash");
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

function merge(baseObj, ...sources) {
  const firstSource = sources[0];
  if (firstSource === undefined) {
    return baseObj;
  }
  return sources.slice(1).reduce((merged, nextSource) => mergeObjects(merged, nextSource), mergeObjects(baseObj, firstSource));
}
const isMergable = obj => (0, _lodash.isPlainObject)(obj);
const mergeObjects = (baseObj, overrideObj) => [...new Set([...Object.keys(baseObj), ...Object.keys(overrideObj)])].reduce((merged, key) => {
  const baseVal = baseObj[key];
  const overrideVal = overrideObj[key];
  if (isMergable(baseVal) && isMergable(overrideVal)) {
    merged[key] = mergeObjects(baseVal, overrideVal);
  } else if (overrideVal !== undefined) {
    merged[key] = overrideVal;
  } else if (baseVal !== undefined) {
    merged[key] = baseVal;
  }
  return merged;
}, {});