what to use for styling with react code example

Example: inline style react

// Typical component with state-classes
<ul className="todo-list">
  {this.state.items.map((item,i)=>({
<li 
 className={classnames({ 'todo-list__item': true, 'is-complete': item.complete })}>
            {item.name}
</li>
 })}
</ul>

// Using inline-styles for state
<li className='todo-list__item'
 style={(item.complete) ? styles.complete : {}} />