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There is a newer version: 3.39.0

'use strict';
var $ = require('../internals/export');
var aMap = require('../internals/a-map');
var iterate = require('../internals/iterate');
var set = require('../internals/map-helpers').set;

// `Map.prototype.merge` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', proto: true, real: true, arity: 1, forced: true }, {
  // eslint-disable-next-line no-unused-vars -- required for `.length`
  merge: function merge(iterable /* ...iterables */) {
    var map = aMap(this);
    var argumentsLength = arguments.length;
    var i = 0;
    while (i < argumentsLength) {
      iterate(arguments[i++], function (key, value) {
        set(map, key, value);
      }, { AS_ENTRIES: true });
    }
    return map;
  }
});