Fix allowEmptyInput in configuration files

[astorije]

What steps are needed to reproduce the bug?

I made a reproduction repo at https://github.com/astorije/stylelint-allowEmptyInput-issue-repro. Or follow steps in this issue instead.

What Stylelint configuration is needed to reproduce the bug?

extends: stylelint-config-standard

allowEmptyInput: true

How did you run Stylelint?

Use the following package.json:

{
  "private": true,
  "scripts": {
    "pass": "stylelint \"**/*.css\" --allow-empty-input",
    "fail": "stylelint \"**/*.css\""
  },
  "devDependencies": {
    "stylelint": "15.7.0",
    "stylelint-config-standard": "33.0.0"
  }
}

Make sure to have no CSS file in the folder.

Run:

• yarn pass works as expected
• yarn fail should also work but instead the allowEmptyInput configuration is ignored.

Which version of Stylelint or dependencies are you using?

• stylelint: 15.7.0
• stylelint-config-standard: 33.0.0

What did you expect to happen?

Both ways of using the allowEmptyInput / --allow-empty-input options should produce the same results.

What actually happened?

$ stylelint "**/*.css"
Error: No files matching the pattern "**/*.css" were found.
    at standalone (/[...]node_modules/stylelint/lib/standalone.js:260:43)

(In case it might be related: #5142)

Does the bug relate to non-standard syntax?

No response

Proposal to fix the bug

No response

[ybiquitous]

@astorije Thanks for the report with the reproduction!

Indeed, this is a bug, and we should fix the following logic:

stylelint/lib/standalone.js

Lines 254 to 255 in 1c44f18

	} else if (allowEmptyInput ?? config?.allowEmptyInput) {
	stylelintResults = await Promise.all([]);

I've labeled the issue as ready to implement. Please consider contributing if you have time.

[astorije]

Please consider contributing if you have time.

You went faster than I could react :D
Next time!

Thank you so much for fixing this, works like a charm :)

[ybiquitous]

Ya, I created a PR since I found the cause immediately. 😄
I'd expect your next time contribution!