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node_modules/core-js/modules/esnext.iterator.reduce.js

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+'use strict';
+var $ = require('../internals/export');
+var iterate = require('../internals/iterate');
+var aCallable = require('../internals/a-callable');
+var anObject = require('../internals/an-object');
+var getIteratorDirect = require('../internals/get-iterator-direct');
+
+var $TypeError = TypeError;
+
+// `Iterator.prototype.reduce` method
+// https://github.com/tc39/proposal-iterator-helpers
+$({ target: 'Iterator', proto: true, real: true }, {
+  reduce: function reduce(reducer /* , initialValue */) {
+    anObject(this);
+    aCallable(reducer);
+    var record = getIteratorDirect(this);
+    var noInitial = arguments.length < 2;
+    var accumulator = noInitial ? undefined : arguments[1];
+    var counter = 0;
+    iterate(record, function (value) {
+      if (noInitial) {
+        noInitial = false;
+        accumulator = value;
+      } else {
+        accumulator = reducer(accumulator, value, counter);
+      }
+      counter++;
+    }, { IS_RECORD: true });
+    if (noInitial) throw $TypeError('Reduce of empty iterator with no initial value');
+    return accumulator;
+  }
+});