Bug: TypeError: tslib_1.__spreadArray is not a function

[MrDeerly]

Describe the bug
With the latest release (rc.21) test cases using the spread operator will fail because of TypeError: tslib_1.__spreadArray is not a function. The issue is most likely coming directly from tslib (see issue linked below) and was introduced with the latest update of tslib (8d27843).

To Reproduce
A reproduction can be a test case for a piece of code which uses a spread operator. Example:

 const funcToTest () => {
       const arr1 = [1, 2];
       const arr2 = [...arr1, 3];
       console.log(arr2)
}

...
 it('should do nothing' () => {
   ...
    console.log = jest.fn();
    const expectedOutput = [1, 2, 3]

    // invoke funcToTest in some nice way :) 

    expect(console.log).toHaveBeenCalledWith(expectedOutput);
   ...
}

TC will fail with TypeError: tslib_1.__spreadArray is not a function

Expected behavior
Test case should pass / using the spread operator shouldn't be an issue.

Related information:

• @vue/test-utils version: 2.0.0-rc.21
• Vue version: 3.2.33
• node version: 18.1.0
• npm (or yarn) version: 8.8.0

Additional context
It's probably upstreamed from microsoft/tslib#149

[cexbrayat]

Hi @MrDeerly

I don't think this comes from VTU: rc.21 was still using tslib v2.3.1 (the commit you linked has not been released yet), and that shouldn't impact you anyway. Your project is probably using the faulty tslib version to compile the tests you wrote.
So I don't think we can do much here.

Try to check if your build/tooling is not relying on this version of tslib. You can probably force a resolution to use v2.3.1 until a fixed tslib is released.

If you really think this is caused by VTU, try to put together a small reproduction on github and we'll take a look.

[MrDeerly]

Hey @cexbrayat,

understood, should've looked more closely on the timestamps... :) With that in mind the issue is definitely not coming from VTU.

Thanks alot for your time!

[MrDeerly]

Just in case someone is experiencing the same issue, the broken tslib version is comming from @vue/cli-service:

├─┬ @vue/cli-service@5.0.4
│ └─┬ html-webpack-plugin@5.5.0
│   └─┬ html-minifier-terser@6.1.0
│     ├─┬ camel-case@4.1.2
│     │ ├─┬ pascal-case@3.1.2
│     │ │ ├─┬ no-case@3.0.4
│     │ │ │ ├─┬ lower-case@2.0.2
│     │ │ │ │ └── tslib@2.3.1 deduped
│     │ │ │ └── tslib@2.3.1 deduped
│     │ │ └── tslib@2.3.1 deduped
│     │ └── tslib@2.3.1
│     └─┬ param-case@3.0.4
│       ├─┬ dot-case@3.0.4
│       │ └── tslib@2.3.1 deduped
│       └── tslib@2.3.1 deduped