[Bug]: "SyntaxError: Unexpected token 'with'" error when using import assertions (ESM)

[pablomarquezcabify]

Version

29.6.1

Steps to reproduce

1. Clone this repo
2. Run npm install and npm test

Expected behavior

Runs test

Actual behavior

Returns the follwing error:

 SyntaxError: Unexpected token 'with'

      at Runtime.loadEsmModule (node_modules/jest-runtime/build/index.js:510:20)

Additional context

I'm using @babel/plugin-syntax-import-attributes with option deprecatedAssertSyntax so we can still use assert keyword (needed for my project). Babel is transforming it to with keyword.

Environment

System:
    OS: macOS 12.5.1
    CPU: (8) arm64 Apple M2
  Binaries:
    Node: 18.16.1 - ~/.volta/tools/image/node/18.16.1/bin/node
    Yarn: 4.0.0-rc.44 - ~/.volta/tools/image/yarn/4.0.0-rc.44/bin/yarn
    npm: 9.5.1 - ~/.volta/tools/image/node/18.16.1/bin/npm
  npmPackages:
    jest: 29.6.1 => 29.6.1

[mrazauskas]

If Jest config with transform: {} is added to your reproduction repo, the test is passing. Did I miss something? Do you need Babel for some reason?

Your project is written in ESM syntax and you have "type": "module" in package.json. So Jest is executing everything as ESM. There is no need to involve Babel, which is generally used to transform code into CJS. The transform: {} line simply tells to not transform anything. That would not work if you need Babel for some reason.

[pablomarquezcabify]

Indeed that fixed it 🙌

Now that you're saying, I don't think we need Babel at all at this point. So thanks again for that.

[github-actions]

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