grapesjs/src/dom_components/model/ComponentLink.js

const Component = require('./ComponentText');

module.exports = Component.extend({

  defaults: { ...Component.prototype.defaults,
      type: 'link',
      tagName: 'a',
      traits: ['title', 'href', 'target'],
  },

  /**
   * Returns object of attributes for HTML
   * @return {Object}
   * @private
   */
  getAttrToHTML(...args) {
    const attr = Component.prototype.getAttrToHTML.apply(this, args);
    delete attr.onmousedown;
    return attr;
  },

}, {

  isComponent(el) {
    let result;
    let avoidEdit;

    if (el.tagName == 'A') {
      result = {
        type: 'link',
        editable: 0,
      };

      // The link is editable only if, at least, one of its
      // children is a text node (not empty one)
      const children = el.childNodes;
      const len = children.length;
      if (!len) delete result.editable;

      for (let i = 0; i < len; i++) {
        const child = children[i];

        if (child.nodeType == 3 && child.textContent.trim() != '') {
          delete result.editable;
          break;
        }
      }
    }

    return result;
  },

});