When you try to install module, you can see fatal error:
The website encountered an unexpected error. Please try again later.
ParseError: syntax error, unexpected ')' in Composer\Autoload\includeFile() (line 61 of modules\contrib\firebase\src\Controller\FirebaseHelpController.php).
...
Closed: works as designed
3.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This error occurs because versions of PHP before 7.3 do not support trailing commas in function calls: https://wiki.php.net/rfc/trailing-comma-function-calls
So, you should only get this error on PHP 7.2 or earlier.
However, the 3.x-dev branch requires PHP 7.4 or higher in composer.json, so the solution here is to update the version of PHP you are using.