How to use the @patternfly/react-core.ButtonVariant.plain function in @patternfly/react-core

Disabled Action
      ,
      ,
      Separated Link,
      Separated Action
    ];
    const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="groups-example-uid-01">
              
            </button>
          
          
            <button aria-label="Setings actions" id="groups-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;

<button aria-label="create" type="button">
            
          </button>
          <button aria-label="close" type="button">
            
          </button>
        
      
    
  );
};

Disabled Action
      ,
      ,
      Separated Link,
      Separated Action
    ];
    const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="simple-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="simple-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;

);
          })}
        
      
    );
    const PageToolbar = (
      
        
          
            <button aria-label="Toggle Connect Form" id="connectButton">
              
            </button>
          
          
             (this.notificationRef = el)}
              suppress={this.state.suppress}
            /&gt;

const ClearIndicator = ({
  clearValue,
  innerProps: { ref, ...restInnerProps },
}) =>(
  <button>
    
  </button>
);

]

  const userDropdownItems = [
    
       logout()}>
        {t('buttons.logout')}
      
    
  ]

  return (
    
      
        
          <button aria-label="Settings actions">
            
          </button>
        
        
          <button aria-label="Help actions">
            
          </button>

const userDropdownItems = [
      Link,
      Action,
      Disabled Link,
      
        Disabled Action
      ,
      ,
      Separated Link,
      Separated Action
    ];
    const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="horizontal-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="horizontal-example-uid-02">
              
            </button>
          
        
        
          
            }

Disabled Action
      ,
      ,
      Separated Link,
      Separated Action
    ];
    const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="default-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="default-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;

Disabled Action
      ,
      ,
      Separated Link,
      Separated Action
    ];
    const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="default-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="default-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;

<button aria-label="Notifications actions" id="horizontal-example-uid-01">
            
          </button>
        
        
          <button aria-label="Settings actions" id="horizontal-example-uid-02">
            
          </button>
        
      
    
  );
};