Chai Assertion error doesn't have 'operator' attribute

Hey everyone, I’m currently working on a feature in jest repo (https://github.com/facebook/jest/pull/8454). While I came across that output is as follows. (https://github.com/facebook/jest/pull/8454/files#diff-e6f1eef106ffd32cb2e65acae35856b8R7)

assert.(received, expected)

    Expected value   "hello sunshine"
    Received:
      "hello world"

    Message:
      expected 'hello world' to equal 'hello sunshine'

    Difference:

    - Expected
    + Received

    - hello sunshine
    + hello world

      11 | describe('chai.js assertion library test', () => {
      12 |   it('expect', () => {
    > 13 |     chai.expect('hello world').to.equal('hello sunshine');
         |                                   ^
      14 |   });
      15 | 
      16 |   it('should', () => {

      at Object.equal (__tests__/chai_assertion.js:13:35)

it is because of https://github.com/facebook/jest/blob/master/packages/jest-circus/src/formatNodeAssertErrors.ts#L127, unable to extract the operator. In https://nodejs.org/api/assert.html#assert_new_assert_assertionerror_options shows a property of operator.

is it this a bug or have I taken a wrong approach? Thanks a lot.

[SimenB]

assert.(received, expected) at the top, it should say assert.equal(received, expected) or some such

[rpgeeganage]

Fixed with https://github.com/chaijs/chai/pull/1257