ckeditor5-1.0.x-dev/js/drupal/src/drupalEmphasis/src/drupalemphasisediting.js

import { Plugin } from 'ckeditor5/src/core';

/**
 * Converts italic text into em.
 */
class DrupalEmphasisEditing extends Plugin {

  /**
   * @inheritdoc
   */
  static get pluginName() {
    return 'DrupalEmphasisEditing';
  }

  /**
   * @inheritdoc
   */
  init() {
    this.editor.conversion.for('downcast').attributeToElement({
      model: 'italic',
      view: 'em',
      converterPriority: 'high'
    });
  }

}

export default DrupalEmphasisEditing;