import concatLimit from './concatLimit.js'
import awaitify from './internal/awaitify.js'

 * The same as [`concat`]{@link module:Collections.concat} but runs only a single async operation at a time.
 * @name concatSeries
 * @static
 * @memberOf module:Collections
 * @method
 * @see [async.concat]{@link module:Collections.concat}
 * @category Collection
 * @alias flatMapSeries
 * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
 * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`.
 * The iteratee should complete with an array an array of results.
 * Invoked with (item, callback).
 * @param {Function} [callback] - A callback which is called after all the
 * `iteratee` functions have finished, or an error occurs. Results is an array
 * containing the concatenated results of the `iteratee` function. Invoked with
 * (err, results).
 * @returns A Promise, if no callback is passed
function concatSeries(coll, iteratee, callback) {
    return concatLimit(coll, 1, iteratee, callback)
export default awaitify(concatSeries, 3);