app/assets/javascripts/content_editor/extensions/horizontal_rule.js


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import { nodeInputRule } from '@tiptap/core';
import { HorizontalRule } from '@tiptap/extension-horizontal-rule';

export default HorizontalRule.extend({
  addInputRules() {
    const hrInputRuleRegExp = /^---$/;

    return [nodeInputRule({ find: hrInputRuleRegExp, type: this.type })];
  },
});