Invalid JSON output

[mxr576]

How is drupal-check installed?
drupal-check is installed as a dependency to my project

Environment:

• OS: Linux (Docker containers by Wodby)
• PHP Version: 7.4
• Drupal core: 9.2.x

Describe the bug

./vendor/bin/drupal-check --format=json returns an invalid JSON since 1.3.0. 62dfa4d and that has not been fixed in 900d859 either. Why? Because in some runtime environments, like Docker containers, stderr and stdout is redirected to the same destination, /proc/self/fd/2.

php -i | grep error_log
error_log => /proc/self/fd/2 => /proc/self/fd/2

Suggested solution
If this information truly needed to be added to the output in every possible output formats then the added message must respect the expected output format.

Console output

./vendor/bin/drupal-check web
/modules/custom/ --format=json --no-progress
{
    "totals": {
        "errors": 0,
        "file_errors": 0
    },
    "files": [],
    "errors": []
}Thanks for using drupal-check!

Consider sponsoring the development of the maintainers which make drupal-check possible:

- phpstan (ondrejmirtes): https://github.com/sponsors/ondrejmirtes
- phpstan-deprecation-rules (ondrejmirtes)): https://github.com/sponsors/ondrejmirtes
- phpstan-drupal (mglaman)): https://github.com/sponsors/mglaman
- drupal-check (mglaman)): https://github.com/sponsors/mglaman

[mxr576]

#271 was the issue when the message was redirected to stderr.