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

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+'use strict';
+var $ = require('../internals/export');
+var call = require('../internals/function-call');
+var aCallable = require('../internals/a-callable');
+var anObject = require('../internals/an-object');
+var isObject = require('../internals/is-object');
+var getBuiltIn = require('../internals/get-built-in');
+var getIteratorDirect = require('../internals/get-iterator-direct');
+var closeAsyncIteration = require('../internals/async-iterator-close');
+
+var Promise = getBuiltIn('Promise');
+var $TypeError = TypeError;
+
+// `AsyncIterator.prototype.reduce` method
+// https://github.com/tc39/proposal-async-iterator-helpers
+$({ target: 'AsyncIterator', proto: true, real: true }, {
+  reduce: function reduce(reducer /* , initialValue */) {
+    anObject(this);
+    aCallable(reducer);
+    var record = getIteratorDirect(this);
+    var iterator = record.iterator;
+    var next = record.next;
+    var noInitial = arguments.length < 2;
+    var accumulator = noInitial ? undefined : arguments[1];
+    var counter = 0;
+
+    return new Promise(function (resolve, reject) {
+      var ifAbruptCloseAsyncIterator = function (error) {
+        closeAsyncIteration(iterator, reject, error, reject);
+      };
+
+      var loop = function () {
+        try {
+          Promise.resolve(anObject(call(next, iterator))).then(function (step) {
+            try {
+              if (anObject(step).done) {
+                noInitial ? reject($TypeError('Reduce of empty iterator with no initial value')) : resolve(accumulator);
+              } else {
+                var value = step.value;
+                if (noInitial) {
+                  noInitial = false;
+                  accumulator = value;
+                  loop();
+                } else try {
+                  var result = reducer(accumulator, value, counter);
+
+                  var handler = function ($result) {
+                    accumulator = $result;
+                    loop();
+                  };
+
+                  if (isObject(result)) Promise.resolve(result).then(handler, ifAbruptCloseAsyncIterator);
+                  else handler(result);
+                } catch (error3) { ifAbruptCloseAsyncIterator(error3); }
+              }
+              counter++;
+            } catch (error2) { reject(error2); }
+          }, reject);
+        } catch (error) { reject(error); }
+      };
+
+      loop();
+    });
+  }
+});