Implementing Promise.any

MyPromise.any = function(promises){
  return new Promise((resolve,reject)=>{
    promises = Array.isArray(promises) ? promises : []
    let len = promises.length
    // used to collect all rejections
    let errs = []
    // If an empty array is passed in, directly return AggregateError
    if(len === 0) return reject(new AggregateError('All promises were rejected'))
    promises.forEach((promise)=>{
      promise.then(value=>{
        resolve(value)
      },err=>{
        len--
        errs.push(err)
        if(len === 0){
          reject(new AggregateError(errs))
        }
      })
    })
  })
}