BookStack/app/Entities/Tools/Markdown/CustomStrikeThroughExtension.php

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<?php namespace BookStack\Entities\Tools\Markdown;
use League\CommonMark\ConfigurableEnvironmentInterface;
use League\CommonMark\Extension\ExtensionInterface;
use League\CommonMark\Extension\Strikethrough\Strikethrough;
use League\CommonMark\Extension\Strikethrough\StrikethroughDelimiterProcessor;
class CustomStrikeThroughExtension implements ExtensionInterface
{
public function register(ConfigurableEnvironmentInterface $environment)
{
$environment->addDelimiterProcessor(new StrikethroughDelimiterProcessor());
$environment->addInlineRenderer(Strikethrough::class, new CustomStrikethroughRenderer());
}
}