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Tests pass despite import of nonexistent named export #9442

@patrickshipe

Description

@patrickshipe

Describe the bug

Vitest seems to suppress errors when importing named exports that do not exist, but the file does (e.g. import { LolNotReal } from './utils.js'; which I do in my reproduction), with the resulting import having a value of undefined. This is problematic since when the actual code is executed with Node, Node will crash.

I'd expect Vitest to also fail in this scenario – otherwise our tests do not give confidence that this code works.

This bug also occurs with TypeScript, but I provided a JS-only minimum reproduction to remove that factor. In my reproduction both files are ESM, to remove CJS quirks out of the equation.

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-lomnlkfi?file=src%2Fbasic.js

If you run npm run test you will see the test imports the file and passes, even logging the line showing the value of the import is undefined.

But if you run node src/basic.js you will see:

❯ node src/basic.js
file:///home/projects/vitest-dev-vitest-lomnlkfi/src/basic.js:1
import { LolNotReal } from './utils.js';
         ^^^^^^^^^^

file:///home/projects/vitest-dev-vitest-lomnlkfi/src/basic.js:1
import { LolNotReal } from './utils.js';
         ^^^^^^^^^^
SyntaxError: The requested module './utils.js' does not provide an export named 'LolNotReal'
    at ModuleJob._instantiate (https://vitestdevvitestlomnlkfi-t2wm.w-credentialless-staticblitz.com/builtins.97a3df4f.js:158:2290)

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @vitest/ui: latest => 4.0.17 
    vite: latest => 7.3.1 
    vitest: latest => 4.0.17

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npm

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