Delete an object's entry. Doesn't mutate.

deleteObjectKey.ts

export const deleteObjectKey = <T extends Record<string, any>>(
  obj: T,
  path: string
): T => {
  const newObj = { ...obj };
  const paths = path.split(".");

  paths.reduce((acc, key, idx) => {
    if (idx === paths.length - 1) {
      delete acc[key];
      return true;
    }
    return acc[key];
  }, newObj);

  return newObj;
};

// usage
const newObj = deleteObjectKey(obj, "a.b.c");