类型演算之Pick

React中的应用

巧用Pick给props以默认值

interface IProps {
  a: string
  b: string
}

class Test extends React.Component<IProps> {
  static defaultProps: Pick<IProps, 'a'> {
    a: '123'
  }
}

class User extends React.Component {
  render() {
    return <Test b='123' />
  }
}