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'use strict';
import concat from './internal/concat';
import doSeries from './internal/doSeries';
/**
* The same as `concat` but runs only a single async operation at a time.
*
* @name concatSeries
* @static
* @memberOf async
* @see async.concat
* @category Collection
* @param {Array|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item in `coll`.
* The iteratee is passed a `callback(err, results)` which must be called once
* it has completed with an error (which can be `null`) and an array of results.
* Invoked with (item, callback).
* @param {Function} [callback(err)] - 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).
*/
export default doSeries(concat);
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