Also return original values for deleted and updated? Feature request.

[Sean Park-Ross]

Hi Matt. Great package thanks.

Would you be able to create versions of deletedDiff, updatedDiff, detailedDiff or have them accept an optional shouldShowOriginal argument to also return the original values too? Eg:

const lhs = {
  foo: {
    bar: {
      a: ['a', 'b'],
      b: 2,
      c: ['x', 'y'],
      e: 100 // deleted
    }
  },
  buzz: 'world'
};

const rhs = {
  foo: {
    bar: {
      a: ['a'], // index 1 ('b')  deleted
      b: 2, // unchanged
      c: ['x', 'y', 'z'], // 'z' added
      d: 'Hello, world!' // added
    }
  },
  buzz: 'fizz' // updated
};

console.log(detailedDiff(lhs, rhs, true));

/*
{
  added: {
    foo: {
      bar: {
        c: {
          '2': 'z'
        },
        d: 'Hello, world!'
      }
    }
  },
  deleted: {
    foo: {
      bar: {
        a: {
          '1': undefined
        },
        e: undefined
      }
    }
  },
  deletedOriginal: {
    foo: {
      bar: {
        a: ['a', 'b'],
        e: 100
      }
    }
  },
  updated: {
    buzz: 'fizz'
  }
  updatedOriginal: {
    buzz: 'world'
  }
}
*/

Obviously just showing detailedDiff implementation but would be same for deletedDiff, updatedDiff.

Thanks.
Sean

[Thomas Guillet]

@seanonthenet did you find a workaround or another package? I would like a similar feature. Thanks.

[Sean Park-Ross]

@guillett sorry, no

[TurningTide]

@guillett, @seanonthenet
as a dirty workaround:

let results = datailedDiff(oldItem, newItem);
results.deletedOriginal = deletedDiff(results.deleted, oldItem);
results.updatedOriginal = updatedDiff(results.updated, oldItem);