function mapSeries (coll, iteratee, callback) {
        return _asyncMap(eachOfSeries$1, coll, iteratee, callback)
    }
The same as [`map`]{@link module:Collections.map} but runs only a single async operation at a time.

@name mapSeries
@static
@memberOf module:Collections
@method
@see [async.map]{@link module:Collections.map}
@category Collection
@param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
@param {AsyncFunction} iteratee - An async function to apply to each item in
`coll`.
The iteratee should complete with the transformed item.
Invoked with (item, callback).
@param {Function} [callback] - A callback which is called when all `iteratee`
functions have finished, or an error occurs. Results is an array of the
transformed items from the `coll`. Invoked with (err, results).
@returns {Promise} a promise, if no callback is passed