allow you dynamicaly create array of keys (with or without some of them or new) and provide typed return value

compute-arr-of-keys.types-fn.ts

export function computeArrOfKeys<
  T extends object,
  R extends readonly (keyof T)[],
  A extends readonly string[]>(
  obj: Required<Record<keyof Required<T>, null>>,
  rm: R, ...add: A) {
  const origin = new Set(Object.keys(obj));

  add.forEach((a) => origin.add(a));
  rm.forEach((r) => origin.delete(r as string));

  return Array.from(origin) as Exclude<keyof T | A[number], R[number]>[];
}