Object History Debugger

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See where the properties of an object were assigned and what their past values were.Use the extension to find out why a value has changed.

The Chrome extension won't work for all pages. You can use the Babel plugin instead for something less flaky, just add it to your build process locally. https://github.com/mattzeunert/Object-History-Debugger

To run the debugger, click the icon in the top right, which will reload the page with assignment tracking enabled. Then when inspecting objects you can see both `propertyName` and `propertyName__history__`.