toMatchObject doesn't support matchers but only exact values

[NaveenNeti]

Thank you to all for the work on this project.

The JSR page for @std/expect states "Jest compatible expect assertion functions"

While trying to use toMatchObject I noticed it doesn't seem to support asymmetric matchers similar to what jest would allow.

e.g. within Jest

  expect({ position: { x: 0, y: 0 } }).toMatchObject({
    position: {
      x: expect.any(Number),
      y: expect.any(Number)
    }
  });

Running the same test in Deno:

Deno.test("CustomMatcher tests", () => {
    expect({ position: { x: 0, y: 0 } }).toMatchObject({
        position: {
            x: expect.any(Number),
            y: expect.any(Number),
        },
    });
});

Results in the output:

error: AssertionError: Values are not equal.
    [Diff] Actual / Expected
    {
      position: {
+       x: {
+         value: [Function: Number],
+       },
+       y: {
+         value: [Function: Number],
+       },
-       x: 0,
-       y: 0,
      },
    }

Describe the solution you'd like

• Would be great if the toMatchObject would have consistent behavior with jest and allow for asymmetric matchers
• From what I can see it would require edits to: https://jsr.io/@std/expect/1.0.5/_matchers.ts#L461 https://jsr.io/@std/expect/1.0.5/_matchers.ts#L487

Would be keen to help provide an MR to add support for it assuming the project owners see value.

Versions

deno: 2.0.0
@std/assert/1.0.6

[eryue0220]

I'll check this later.

[NaveenNeti]

Thank you @eryue0220 I will test this tomorrow 🙏