Basic diffing broken

[nhandyal]

Description
Basic diff functionality seems to be broken.

const detailedDiff = require("deep-object-diff").detailedDiff;

const lhs = {
  'a': 1,
  'b': 2
};

const rhs = {
  'a': 1
};

diff = detailedDiff(lhs, rhs);
console.log(JSON.stringify(diff, null, 2));

// Expected
{
  "added": {},
  "deleted": {
    "b": 2
  },
  "updated": {}
}

// Actual
{
  "added": {},
  "deleted": {},
  "updated": {}
}

https://repl.it/repls/ThankfulFumblingOpenlook

[mattphillips]

Hey @nhandyal the problem you are seeing is because of JSON.stringify which strips out any undefined values.

undefined is used to represent the value that has been deleted, or rather is now undefined.

If you try this it should work as expected:

const detailedDiff = require("deep-object-diff").detailedDiff;

const lhs = {
  'a': 1,
  'b': 2
};

const rhs = {
  'a': 1
};

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