packages/common/src/utils/array.ts

export function moveItem(array, oldIndex, newIndex) {
  if (newIndex >= array.length) {
    let k = newIndex - array.length;
    while (k-- + 1) {
      array.push(undefined);
    }
  }
  array.splice(newIndex, 0, array.splice(oldIndex, 1)[0]);
  return array; // for testing purposes
}