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name : mapValuesLimit.js
 'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _eachOfLimit = require('./internal/eachOfLimit.js');

var _eachOfLimit2 = _interopRequireDefault(_eachOfLimit);

var _awaitify = require('./internal/awaitify.js');

var _awaitify2 = _interopRequireDefault(_awaitify);

var _once = require('./internal/once.js');

var _once2 = _interopRequireDefault(_once);

var _wrapAsync = require('./internal/wrapAsync.js');

var _wrapAsync2 = _interopRequireDefault(_wrapAsync);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * The same as [`mapValues`]{@link module:Collections.mapValues} but runs a maximum of `limit` async operations at a
 * time.
 *
 * @name mapValuesLimit
 * @static
 * @memberOf module:Collections
 * @method
 * @see [async.mapValues]{@link module:Collections.mapValues}
 * @category Collection
 * @param {Object} obj - A collection to iterate over.
 * @param {number} limit - The maximum number of async operations at a time.
 * @param {AsyncFunction} iteratee - A function to apply to each value and key
 * in `coll`.
 * The iteratee should complete with the transformed value as its result.
 * Invoked with (value, key, callback).
 * @param {Function} [callback] - A callback which is called when all `iteratee`
 * functions have finished, or an error occurs. `result` is a new object consisting
 * of each key from `obj`, with each transformed value on the right-hand side.
 * Invoked with (err, result).
 * @returns {Promise} a promise, if no callback is passed
 */
function mapValuesLimit(obj, limit, iteratee, callback) {
    callback = (0, _once2.default)(callback);
    var newObj = {};
    var _iteratee = (0, _wrapAsync2.default)(iteratee);
    return (0, _eachOfLimit2.default)(limit)(obj, (val, key, next) => {
        _iteratee(val, key, (err, result) => {
            if (err) return next(err);
            newObj[key] = result;
            next(err);
        });
    }, err => callback(err, newObj));
}

exports.default = (0, _awaitify2.default)(mapValuesLimit, 4);
module.exports = exports.default;
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