JSDOM overrides Uint8Array implementation

[TrySound]

🐛 Bug Report

I got a case yesterday where default environment makes this expression buffer instanceof Uint8Array falsy.

This looks like related issue #9983

To Reproduce

Steps to reproduce the behavior:

• install jest
• add test.js with the following code

const fs = require('fs');
test('test buffer', () => {
  const buffer = Buffer.from('')
  expect(buffer instanceof Uint8Array).toBeTruthy()
})

The test will fail. Though when I set node environment everything works again.

Expected behavior

Buffer extends Uint8Array and instanceof should work with jsdom.

Link to repl or repo (highly encouraged)

https://repl.it/repls/CanineSpicyPetabyte

envinfo

  System:
    OS: macOS Mojave 10.14.6
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
  Binaries:
    Node: 13.12.0 - /var/folders/93/vjl05hsx4_vdnhvdtky_qx8m0000gn/T/fnm-shell-3627797/bin/node
    Yarn: 1.18.0 - /usr/local/bin/yarn
    npm: 6.14.4 - /var/folders/93/vjl05hsx4_vdnhvdtky_qx8m0000gn/T/fnm-shell-3627797/bin/npm
  npmPackages:
    jest: ^26.0.1 => 26.0.1 

[jacogr]

Think this is the same issue as I had in #9983 - this seems to be the underlying cause.

[thymikee]

Let's close this one then and continue on #9983, hope you don't mind @TrySound

[github-actions]

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