Undocumented modification of oldValue when calling applyDiff

[wweaver]

It seems that when there are nested objects the original value is modified when calling applyDiff

import { applyDiff, getDiff } from 'recursive-diff';

const origVal = { foo: { a: 1, b: 2, c: 3 } };
const newVal = { foo: { a: 11, b: 22, d: 44 } };

const delta = getDiff(origVal, newVal);

console.log('before', { origVal, newVal });
/* --- output
before {
  origVal: { foo: { a: 1, b: 2, c: 3 } },
  newVal: { foo: { a: 11, b: 22, d: 44 } }
}
*/

const finalVal = applyDiff(origVal, delta);

console.log('after', { origVal, newVal, finalVal });
/* --- output
after {
  origVal: { foo: { a: 11, b: 22, d: 44 } },
  newVal: { foo: { a: 11, b: 22, d: 44 } },
  finalVal: { foo: { a: 11, b: 22, d: 44 } }
}
*/

[cosmicanant]

this is by design itself. Updated the readme file to explain this behavior.