[rush] Npm `script-shell` Setting Not Respected by `rush`

[stan-kondrat]

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Summary

Configuring Rush to use Bash as the script shell on Windows via the .npmrc setting (script-shell=bash) does not work with rush. Despite this configuration, rush always defaults to using cmd.exe, whereas npm run correctly respects the script-shell setting.

Reproduction Steps

1. On Windows, install Git Bash or ensure Bash is available.
2. Add script-shell=bash to the .npmrc file in the project root.
3. Create a script in package.json:

   "scripts": {
     "test-script": "echo $0"
   }
   

4. Run the script using rushx:

   rushx test-script
   

5. Run the same script using npm run:

   npm run test-script
   

Expected Result

Both rushx test-script and npm run test-script should execute using Bash and output bash.

Actual Result

• npm run test-script correctly uses Bash and outputs bash.
• rushx test-script uses cmd.exe and outputs $0, ignoring the script-shell setting.

Technical Details

It appears that rushx does not respect the script-shell configuration in .npmrc, always defaulting to the system shell (cmd.exe on Windows). This inconsistency with npm run may cause issues for projects relying on Unix-like shell behavior.

Suggested Solution

Ensure that rushx checks and honors the script-shell setting from .npmrc when executing scripts, aligning its behavior with npm run.

Standard Questions

Question	Answer
@microsoft/rush globally installed version?	Yes
rushVersion from rush.json?	5.141.2
useWorkspaces from rush.json?
Operating system?	Windows 10/11
Would you consider contributing a PR?	No
Node.js version (node -v)?	v20.11.0