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node_modules/core-js/internals/async-iterator-indexed.js

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+'use strict';
+var call = require('../internals/function-call');
+var map = require('../internals/async-iterator-map');
+
+var callback = function (value, counter) {
+  return [counter, value];
+};
+
+// `AsyncIterator.prototype.indexed` method
+// https://github.com/tc39/proposal-iterator-helpers
+module.exports = function indexed() {
+  return call(map, this, callback);
+};