[Bug]: toStrictEquals incorrectly compares class instances with getters that access private fields

[PSanetra]

Version

29.0.3

Steps to reproduce

Execute the following test that fails:

class ClassWithPrivateJsField {
  #_a: string;

  constructor(a: string) {
    this.#_a = a;
  }

  get a() {
    return this.#_a;
  }
}

describe('toStrictEqual', () => {
  describe('on class instances with private javascript fields', () => {
    it('should not consider objects with different js-private field values via getter to be equal', () => {
      expect(new ClassWithPrivateJsField('v1')).not.toStrictEqual(
        new ClassWithPrivateJsField('v2')
      );
    });
  });
});

Also see https://stackblitz.com/edit/node-5wy1ts?file=index.spec.ts

Expected behavior

The test above should be successful

Actual behavior

The test above fails

Debug log

See stackblitz

Additional context

This issue might be somehow related to the follwing jest issues, but I am not 100% sure as there are errors thrown in those issues. In my case with ts-jest toStrictEqual just considers both instances as equal although they are not.

• toEqual throws a TypeError when using getter to private field of class jestjs/jest#10167
• Jest does not support private class fields jestjs/jest#9022

Environment

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 7.17.0 - /usr/local/bin/npm
  npmPackages:
    jest: ^29.2.2 => 29.2.2

[PSanetra]

I am closing this issue as the same issue is reproducible via plain jest: jestjs/jest#13535