By catch on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.0.x
Introduced in version: 
10.0.0
Issue links: 
https://www.drupal.org/node/3094493
Description: 

Twig has been updated from version 2 to 3.

Ensuring that your templates have been fully updated from Twig 1 to Twig 2 is the main preparation most modules and themes will need for Twig 3.

For example, the spaceless tag has been deprecated in Twig 2, in favour of a filter, and the tag has been removed in Twig 3:

Before:

{% spaceless %}
<div>
</div>
{% endspaceless %}

After:

{% apply spaceless %}
<div>
</div>
{% endapply %}

Additionally, support for the 'if' clause has been removed from for statements:

Before:

 {% for i in 1..depth-1 if depth > 1 %}
    <div>
  {% endfor %}
  {{ contents }}
  {% for i in 1..depth-1 if depth > 1 %}
    </div>
  {% endfor %}

After:

 {% if depth > 1 %}{% for i in 1..depth-1 %}
    <div>
  {% endfor %}{% endif %}
  {{ contents }}
      {% if depth > 1 %}{% for i in 1..depth-1 %}
    </div>
  {% endfor %}{% endif %}

Drush 11 required for Drupal 10

Drush 10 has a dependency that requires Twig 1 or Twig 2 so is incompatible with Drupal 10, making Drush 11 required.

Impacts: 
Module developers
Themers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done