Contrib.social

Render README.md on help page as HTML

Open on Drupal.org →
Created on 15 April 2025, about 2 months ago

Problem/Motivation

Currently, the help text for allow_only_one only seems to render the markdown wrapped in an 

 tag. 



When the markdown module is enabled, the site gives a WSOD with this error:

Error: Call to undefined method League|CommonMark\Environment\Environment::setConfig() in Drupal|markdown|Plugin|Markdown|CommonMark|CommonMark->getEnvironment() (line 437 of /var/www/html/web/modules/contrib/markdown/src/Plugin/Markdown/CommonMark/CommonMark.php).



Steps to reproduce

To see the help text as unparsed markdown

    
  
  1. Install the Allow Only One module
    2. 
  
  2. Go to the /admin/help/allow_only_one
    3. 
  
  3. Confirm that the output is unparsed markdown
    4. 



To see the WSOD

    
  
  1. Install the Allow Only One module
    2. 
  
  2. run composer require league/commonmark
  
  3. Install the markdown module
    4. 
  
  4. Go to the Markdown module configuration
    5. 
  
  5. Confirm that a parser is active and set as the default
    6. 
  
  6. Go to the /admin/help/allow_only_one
    7. 
  
  7. Confirm that the site gives a WSOD
    8. 
  
  8. Go to /admin/reports/dblog
    9. 
  
  9. Confirm that there's this error: Error: Call to undefined method League|CommonMark\Environment\Environment::setConfig() 






Proposed resolution




Remaining tasks




User interface changes




API changes




Data model changes
✨ Feature request
Status

Active

Version

1.0

Component

Code

Created by

🇺🇸United States skyriter

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Comments & Activities

  • Issue created by @skyriter
  • Comment about 2 months ago →
    eric.vvf

    I tried to reproduce the error locally, and it seems that the root cause is not in the Allow Only One module but rather in the Markdown module.

    More specifically, the issue comes from its CommonMark plugin, which was calling a deprecated method setConfig() from the league/commonmark library. This method was removed in version 2.3, which caused the WSOD (White Screen of Death) when accessing the help page.

    Here's the thread https://www.drupal.org/project/markdown/issues/3419098 🐛 Call to undefined method League\CommonMark\Environment\Environment::setConfig() Needs review .

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