Function getChangedFields

packages/utils/src/getChangedFields.ts:25–41

(a: unknown, b: unknown)

 * console.log(changedFields); // Output: ['age']
 */
export default function getChangedFields(a: unknown, b: unknown): string[] {
  const aIsPlainObject = isPlainObject(a);
  const bIsPlainObject = isPlainObject(b);
  // If strictly equal or neither of them is a plainObject returns an empty array
  if (a === b || (!aIsPlainObject && !bIsPlainObject)) {
    return [];
  }
  if (aIsPlainObject && !bIsPlainObject) {
    return keys(a);
  }
  if (!aIsPlainObject && bIsPlainObject) {
    return keys(b);
  }
  const unequalFields = keys(pickBy(a as object, (value, key) => !deepEquals(value, get(b, key))));
  const diffFields = difference(keys(b), keys(a));
  return [...unequalFields, ...diffFields];
}