🇧🇪Belgium @vincent@fontaine.online

If it helps, here is how I installed DOMPurify with composer :

composer config repositories.assets composer https://asset-packagist.org
composer config --unset repositories.0
composer config repositories.drupal composer https://packages.drupal.org/8
composer config --json extra.installer-types '["npm-asset", "bower-asset"]'
composer config --json extra.installer-paths.web\/libraries\/dompurify '["npm-asset/dompurify"]'
composer config --unset extra.installer-paths.web\/libraries\/\{\$name\}
composer config --json extra.installer-paths.web\/libraries\/\{\$name\} '["type:drupal-library", "type:bower-asset", "type:npm-asset"]'
composer require npm-asset/dompurify
composer require bower-asset/colorbox