Function insert

src/utils/insert.ts:9–19

(
  data: T[],
  index: number,
  value?: T | T[],
)

  value: T | T[],
): T[];
export default function insert<T>(
  data: T[],
  index: number,
  value?: T | T[],
): (T | undefined)[] {
  return [
    ...data.slice(0, index),
    ...convertToArrayPayload(value),
    ...data.slice(index),
  ];
}