'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  exports.default = during;
  
  var _noop = require('lodash/noop');
  
  var _noop2 = _interopRequireDefault(_noop);
  
  var _onlyOnce = require('./internal/onlyOnce');
  
  var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
  
  var _wrapAsync = require('./internal/wrapAsync');
  
  var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  /**
   * Like [`whilst`]{@link module:ControlFlow.whilst}, except the `test` is an asynchronous function that
   * is passed a callback in the form of `function (err, truth)`. If error is
   * passed to `test` or `fn`, the main callback is immediately called with the
   * value of the error.
   *
   * @name during
   * @static
   * @memberOf module:ControlFlow
   * @method
   * @see [async.whilst]{@link module:ControlFlow.whilst}
   * @category Control Flow
   * @param {AsyncFunction} test - asynchronous truth test to perform before each
   * execution of `fn`. Invoked with (callback).
   * @param {AsyncFunction} fn - An async function which is called each time
   * `test` passes. Invoked with (callback).
   * @param {Function} [callback] - A callback which is called after the test
   * function has failed and repeated execution of `fn` has stopped. `callback`
   * will be passed an error, if one occurred, otherwise `null`.
   * @example
   *
   * var count = 0;
   *
   * async.during(
   *     function (callback) {
   *         return callback(null, count < 5);
   *     },
   *     function (callback) {
   *         count++;
   *         setTimeout(callback, 1000);
   *     },
   *     function (err) {
   *         // 5 seconds have passed
   *     }
   * );
   */
  function during(test, fn, callback) {
      callback = (0, _onlyOnce2.default)(callback || _noop2.default);
      var _fn = (0, _wrapAsync2.default)(fn);
      var _test = (0, _wrapAsync2.default)(test);
  
      function next(err) {
          if (err) return callback(err);
          _test(check);
      }
  
      function check(err, truth) {
          if (err) return callback(err);
          if (!truth) return callback(null);
          _fn(next);
      }
  
      _test(check);
  }
  module.exports = exports['default'];