hash for pointers

let index = 0;
function getIndex(): number {
  index += 1;
  return index;
}

const mapPointerToMap = new WeakMap<TPointer, number>();

type TPointer = object | unknown[];
export function createKeyByPointers(...pointers: TPointer[]): string {
  const result = new Int8Array(pointers.length);

  for (let i = 0, pointer; i < pointers.length; i += 1) {
    pointer = pointers[i];

    if (!mapPointerToMap.has(pointer)) {
      mapPointerToMap.set(pointer, getIndex());
    }

    result[i] = mapPointerToMap.get(pointer);
  }

  return result.join("|");
}