[BUG] Single -- separator fails to pass arguments to npm script in version 10.9.0

[leebailey88]

Is there an existing issue for this?

• I have searched the existing issues

This issue exists in the latest npm version

• I am using the latest npm

Current Behavior

Instead of executing the mtm script with the specified arguments, npm outputs the current version (10.9.0) and exits.

Workaround

npm run mtm -- -- -l 1 -s 0 -h 160000 -f vix/vix-ta-macro-advanced --vix --bci --seasonal --cpi --effr --bond10 --bond2 --aaii --m2 --cape --fileToSheetName -v

Expected Behavior

Running the following command should execute the mtm script in package.json with the provided arguments:

npm run mtm -- -l 1 -s 0 -h 160000 -f vix/vix-ta-macro-advanced --vix --bci --seasonal --cpi --effr --bond10 --bond2 --aaii --m2 --cape --fileToSheetName -v```

### Steps To Reproduce

### Steps to Reproduce
1. Create an `mtm` script in `package.json`:
   ```json
   {
     "scripts": {
       "mtm": "node path/to/your-script.js"
     }
   }

2. Run the command with arguments after a single -- separator:

   npm run mtm -- -l 1 -s 0 -h 160000 -f vix/vix-ta-macro-advanced --vix --bci --seasonal --cpi --effr --bond10 --bond2 --aaii --m2 --cape --fileToSheetName -v

3. Observe that npm prints its version instead of executing the script with the arguments.

Additional Notes

This behavior change only started after upgrading to npm 10.9.0; the command worked correctly on 10.8.0. This change may be a bug or a new feature, but it’s currently undocumented.

Environment

Environment

• npm version: 10.9.0
• Node.js version: 20.11.0
• Operating system: Windows 11

[milaninfy]

Are you running in powershell? --- is also valid as far as i know. This is powershell behaviour.

[milaninfy]

Closing: this looks to be similar if not a duplicate of an existing issue, 7375. If you believe your instance is unique, please provide further clarifying details.