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


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import { Heading } from '@tiptap/extension-heading';
import { textblockTypeInputRule } from '@tiptap/core';

export default Heading.extend({
  addInputRules() {
    return this.options.levels.map((level) => {
      return textblockTypeInputRule({
        // make sure heading regex doesn't conflict with issue references
        find: new RegExp(`^(#{1,${level}})[ \t]$`),
        type: this.type,
        getAttributes: { level },
      });
    });
  },
});