How to use the concat function from async

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const async = require('async')

class AsyncWrapped {
  async concat(coll, iteratee) {    
    return new Promise(async (resolve, reject) => { 
      async.concat(coll, iteratee, (err, res) => {
        if (err) { 
          reject(err)
        } else {
          resolve(res)
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 * `iteratee` functions have finished, or an error occurs. Results is an array
 * containing the concatenated results of the `iteratee` function. Invoked with
 * (err, results).
 * @example
 *
 * async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
 *     // files is now a list of filenames that exist in the 3 directories
 * });
 */
var concat = doLimit(concatLimit, Infinity);
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