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node_modules/core-js/modules/esnext.map.merge.js

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+'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;
+  }
+});