yabwe/medium-editor

const removeFormat = {
            name: 'removeFormat',
            aria: 'remove formatting',
            action: 'removeFormat',
            contentDefault: '<b>X</b>',
            contentFA: '<i class="fa fa-eraser"></i>',
            handleClick: function (event) {
                    event.preventDefault();
                    event.stopPropagation();

                    // Undo default
                    this.execAction('removeFormat');

                    // Undo selection for all custom extension
                    const extensions = this.base.extensions;
                    const extensionsCustomOnly = this.base.options.extensions;

                    for (const key in extensions) {
                        const extension = extensions[key];
                        if (typeof extension.setInactive !== 'function') {    
                            continue;
                        }
                        if (typeof extension.classApplier !== 'object') {
                            continue;
                        }
                        extension.classApplier.undoToSelection();
                        extension.setInactive();
                        this.base.checkSelection();
                        console.log(`undo ${extension.name}`);
                    }
              }
      };