Debugging Jest unit tests with mobx proxies and displayed values

[vjau]

Issue description or question

I have trouble using Wallaby with a Mobx project. Mobx is a state management library that allow you to observe some data change wrapping the data with a proxy.
When the tests are red, instead of seeing the actual (wrong) output under Wallaby, i see the proxy.
Running the same test with the same configuration under Jest without Wallaby gives me the actual output and not the proxy.
Also, using the wallaby debugger and peeking at values, i see the proxy and not the values.

Repro demonstrating the issue :
/~https://github.com/vjau/bugmobxwallaby

Wallaby diagnostics report

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    '2021-12-11T18:25:04.144Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:04.145Z project Test run finished\n',
    '2021-12-11T18:25:04.146Z project Test run data re-queued\n',
    '2021-12-11T18:25:08.315Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:08.333Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:08.333Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:08.336Z project Test run finished\n',
    '2021-12-11T18:25:08.336Z project Test run data re-queued\n',
    '2021-12-11T18:25:08.506Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:08.512Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:08.512Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:08.513Z project Test run finished\n',
    '2021-12-11T18:25:08.513Z project Test run data re-queued\n',
    '2021-12-11T18:25:09.191Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:09.196Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:09.196Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:09.197Z project Test run finished\n',
    '2021-12-11T18:25:09.197Z project Test run data re-queued\n',
    '2021-12-11T18:25:09.736Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:09.741Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:09.741Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:09.742Z project Test run finished\n',
    '2021-12-11T18:25:09.742Z project Test run data re-queued\n',
    '2021-12-11T18:25:09.981Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:09.986Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:09.986Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:09.987Z project Test run finished\n',
    '2021-12-11T18:25:09.987Z project Test run data re-queued\n',
    '2021-12-11T18:25:10.178Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:10.183Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:10.183Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:10.183Z project Test run finished\n',
    '2021-12-11T18:25:10.183Z project Test run data re-queued\n',
    '2021-12-11T18:25:11.747Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:11.752Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:11.752Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:11.753Z project Test run finished\n',
    '2021-12-11T18:25:11.753Z project Test run data re-queued\n',
    '2021-12-11T18:25:12.019Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:12.024Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:12.024Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:12.024Z project Test run finished\n',
    '2021-12-11T18:25:12.024Z project Test run data re-queued\n',
    '2021-12-11T18:25:12.188Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:12.195Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:12.195Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:12.196Z project Test run finished\n',
    '2021-12-11T18:25:12.196Z project Test run data re-queued\n',
    '2021-12-11T18:25:12.298Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:12.303Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:12.303Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:12.304Z project Test run finished\n',
    '2021-12-11T18:25:12.304Z project Test run data re-queued\n',
    '2021-12-11T18:25:12.461Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:12.466Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:12.466Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:12.466Z project Test run finished\n',
    '2021-12-11T18:25:12.466Z project Test run data re-queued\n',
    '2021-12-11T18:25:12.818Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:12.824Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:12.824Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:12.825Z project Test run finished\n',
    '2021-12-11T18:25:12.825Z project Test run data re-queued\n',
    '2021-12-11T18:25:16.026Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:16.031Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:16.031Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:16.031Z project Test run finished\n',
    '2021-12-11T18:25:16.031Z project Test run data re-queued\n',
    '2021-12-11T18:25:17.152Z fs File changed: .gitignore\n',
    '2021-12-11T18:25:17.158Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:17.158Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:17.158Z project Test run finished\n',
    '2021-12-11T18:25:17.158Z project Test run data re-queued\n',
    '2021-12-11T18:25:17.234Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:17.234Z fs No changes detected for .gitignore\n',
    '2021-12-11T18:25:24.331Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:24.337Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:24.337Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:24.337Z project Test run finished\n',
    '2021-12-11T18:25:24.338Z project Test run data re-queued\n',
    '2021-12-11T18:25:24.678Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:24.682Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:24.684Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:24.684Z project Test run finished\n',
    '2021-12-11T18:25:24.684Z project Test run data re-queued\n',
    '2021-12-11T18:25:24.837Z fs File changed in editor: .gitignore\n',
    '2021-12-11T18:25:24.843Z project Test run started; run priority: 2\n',
    '2021-12-11T18:25:24.843Z testTask Test files from affected: 0, from deleted or manually requested: 0, from recently changed: 0, from loaded by: 0, from failing: 0\n',
    '2021-12-11T18:25:24.843Z project Test run finished\n',
    '2021-12-11T18:25:24.843Z project Test run data re-queued\n',
    '2021-12-11T18:25:25.158Z fs File changed: .gitignore\n',
    '2021-12-11T18:25:25.160Z fs No changes detected for .gitignore\n',
    '2021-12-11T18:25:25.160Z extended-core File was not changed, but file markers may need to be synced\n'
  ]
}

[ArtemGovorov]

Thanks for sharing the repo. The issue is now fixed and the fix is published in the latest Wallaby Core v1.0.1189.

[vjau]

Thank you for the quick fix. However there is still a problem with objects. I have updated the repo.
Also if you try to look at the value of this.objs on line 20 of index.ts, you will receive an error cannot convert a symbol value to a string

[ArtemGovorov]

Thanks for checking. The issues are now fixed and the fix is published in the latest Wallaby Core v1.0.1190. Please note that mobx proxy symbol will still be visible (by design) in Value Explorer (it reveals hidden properties unlike plain console.log). It is because the object is still a "proxy" (in both Wallaby and Jest CLI), but the symbol data on the object should not interfere with assertion diffs or inline logs.

[vjau]

Thank you.
Could you please think about a future feature where you could define custom formatters for the debugger like what chrome is doing ?
For this specific use case, the formatter should be able to call mobx toJS function on the value to display.

[ArtemGovorov]

Could you please think about a future feature where you could define custom formatters for the debugger like what chrome is doing ?

Sounds interesting, I have created the feature request at #2875.

For now you may use a simple live comment (may even create a WS live template to quickly insert it) to get the compact view:

  const instance = new FooClass();
  instance.addObj({name:"bar"});

  instance //? require('mobx').toJS($)