🐛 Bug Report

If you pass window.location as the draft to produce, IE11 throws an error. The error is essentially the same one described in this core-js issue.

In short, IE11's native Object.getOwnPropertyDescriptor can't work with environment exotic objects which is the cause for this bug.

You can easily reproduce the issue by pasting this in your IE11 Dev Tools and hitting enter.

Object.getOwnPropertyDescriptor(window.location, 'host')

Link to repro

https://github.com/kdelmonte/immer-ie11-window-location-bug

To Reproduce

• Clone the repo
• Install the serve package
• Run the following command yarn build && serve -s build
• Navigate to http://localhost:5000 using IE 11 and see how the app does not load
• Navigate to http://localhost:5000 using Chrome/FF and see how the app loads fine

To verify that the app loads fine in IE 11 without this bug:

• Comment out the lines 9-11 in the src/index.js file
• Run yarn build && serve -s build once again

Observed behavior

If you pass window.location as the draft to produce, IE11 throws an error.

Expected behavior

produce should be able to successfully create a draft from any object in any of the supported browsers.

Environment

• Latest version of Windows 10
• Latest version of IE11
• Immer 5.2.0

• Immer version:
• Occurs with setUseProxies(true)
• Occurs with setUseProxies(false) (ES5 only)