vi.stubEnv fails to set process.env.NODE_ENV

[jordykoppen]

Describe the bug

Since upgrading to version 0.34.1, vi.stubEnv fails to alter the process.env.NODE_ENV variable.

For example:

// process.env.NODE_ENV = "test"

test("should fail", () => {
  vi.stubEnv("NODE_ENV", "production")
    
  // This fails as it returns "test"
  expect(process.env.NODE_ENV).toBe("production")
})

The issue does not persist if I downgrade to 0.33.0.

The latest version also breaks whenever I try to mutate process.env.NODE_ENV directly:

// process.env.NODE_ENV = "test"

test("should fail", () => {
  process.env.NODE_ENV = "production"
    
  expect(process.env.NODE_ENV).toBe("production")
})

The whole test runner fails with the following error:

Error: Parse failure: Assigning to rvalue (15:4)
At file: /Users/USER/workspace/experiments/vitest-stubenv-bug/app/tests/entry.client.test.tsx
Contents of line 15:     "test" = "production";

Reproduction

I've set up a repo to reproduce my issue in the same stack as the application I'm facing problems with (Remix, Cloudflare pages):
https://github.com/jordykoppen/vitest-stubenv-bug

I've included test cases for both issues.

System Info

System:
    OS: macOS 13.5
    CPU: (10) arm64 Apple M1 Pro
    Memory: 143.50 MB / 16.00 GB
    Shell: 3.6.0 - /opt/homebrew/bin/fish
  Binaries:
    Node: 18.16.1 - ~/.local/share/bin/node
    Yarn: 1.22.19 - ~/.local/share/bin/yarn
    npm: 9.5.1 - ~/.local/share/bin/npm
    pnpm: 8.6.7 - ~/.local/share/bin/pnpm
  Browsers:
    Chrome: 115.0.5790.170
    Safari: 16.6
  npmPackages:
    @vitejs/plugin-react: 4.0.3 => 4.0.3 
    @vitest/coverage-v8: 0.34.1 => 0.34.1 
    vite: 4.4.7 => 4.4.7 
    vitest: 0.34.1 => 0.34.1

Used Package Manager

pnpm

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• The provided reproduction is a minimal reproducible example of the bug.