Function flatten

helpers/blaze/flatten.ts:19–21

* Returns a new array with all sub-array elements concatenated. * (more efficient than native flat) * * @param list * @returns

(list: T & L.List<I>)

 * @returns
 */
function flatten<T extends L.List, I>(list: T & L.List<I>): Flatten<T> {
  return reduce(list, (acc, item) => concat(acc, wrap(item)), [] as any[])
}

type Flatten<L extends L.List, I = L[number]> = (I extends L.List ? I[number] : I)[]