(new Uint8Array(8)).buffer instanceof ArrayBuffer is false when running with node 10.0.0 on macOS

[mstange]

🐛 Bug Report

Updating to node version 10.0.0 caused a failure in our tests which boiled down to an instanceof ArrayBuffer check failing. Here's the reduced test:

expect((new Uint8Array(8)).buffer instanceof ArrayBuffer).toBe(true);

To Reproduce

Execute the test given above using node v10.0.0 on macOS.

Expected behavior

When dealing with a typed array, that array's buffer property should always be instanceof ArrayBuffer.

Link to repl or repo (highly encouraged)

https://github.com/mstange/jest-arraybuffer-testcase

Clone the repo, run yarn install, run yarn test, and you will see a test failure in the affected configuration.

$ yarn test
yarn run v1.6.0
(node:21279) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
$ jest
 FAIL  ./index.test.js
  ✕ ArrayBuffer test (7ms)

  ● ArrayBuffer test

    expect(received).toBe(expected) // Object.is equality

    Expected value to be:
      true
    Received:
      false

      1 | test('ArrayBuffer test', () => {
      2 |   const array = new Uint8Array(8);
    > 3 |   expect(array.buffer instanceof ArrayBuffer).toBe(true);
      4 | });
      5 |

      at Object.<anonymous>.test (index.test.js:3:47)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        0.63s, estimated 1s
Ran all test suites.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Run npx envinfo --preset jest

Paste the results here:

$ npx envinfo --preset jest
npx: installed 1 in 2.091s

  System:
    OS: macOS Sierra 10.12.6
    CPU: x64 Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz
  Binaries:
    Node: 10.0.0 - /usr/local/bin/node
    Yarn: 1.6.0 - /usr/local/bin/yarn
    npm: 6.0.1 - /usr/local/bin/npm
  npmPackages:
    jest: ^22.4.4 => 22.4.4

[SimenB]

firefox-devtools/profiler#1035 (comment)

[wi-ski]

This helped me: #7780 (comment)

[github-actions]

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