Diff Two Flat Objects

export function diffObjects(before, after) {
  const changes = [];
  const keys = new Set([...Object.keys(before), ...Object.keys(after)]);
  for (const key of keys) {
    const had = Object.prototype.hasOwnProperty.call(before, key);
    const has = Object.prototype.hasOwnProperty.call(after, key);
    if (!had && has) {
      changes.push({ key, type: "added", value: after[key] });
    } else if (had && !has) {
      changes.push({ key, type: "removed", value: before[key] });
    } else if (before[key] !== after[key]) {
      changes.push({ key, type: "changed", from: before[key], to: after[key] });
    }
  }
  return changes;
}