React样式组件扩展

Question

import React from 'react'
import styled from 'styled-components'

const StyledChevron = styled.i`
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 14px;
    cursor: pointer;
    border-left: 1px solid #efefef;
    transition: all .1s linear;
    transform: rotate(0deg);
    ${props=>props.closed && ``};
    &:hover {
        background: #f7f4f4;
    }
`

const Chevron = (props) => {

    return (
        <StyledChevron closed={props.item.closed} onClick={()=>{props.openSubMenu(props.item.id)}} className={props.icon}/>
    )

}

export default Chevron

jsx

import React from 'react'
import styled from 'styled-components'
import cssvars from '../../js/style/vars'
import Chevron from './Chevron'

const StyledHeader = styled.div`
    display: flex;
    align-items: center;
    padding: 11px;
    justify-content: space-between;
    background: ${cssvars.primaryColor};
    h2 {
        font-size: 19px;
        color: #fff;
        display: flex;
        align-items: center;
    }
`

const BackChevron = Chevron.extend`
    padding: 0
`

const Header = (props) => {

    return (
        <StyledHeader>
            <h2>{props.item.title}</h2>
            <BackChevron {...props} icon="icon-arrow-left"/>
        </StyledHeader>
    )

}

export default Header

使用上面的代码，im得到控制台错误:未捕获的类型错误:_chevron2.default.extend不是函数

Answer 1

styled-components具有某种继承

chevron.jsx

import React from 'react'
import styled from 'styled-components'

const StyledChevron = styled.i`
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 14px;
    cursor: pointer;
    border-left: 1px solid #efefef;
    transition: all .1s linear;
    transform: rotate(0deg);
    ${props => props.closed && ``};

    &:hover {
        background: #f7f4f4;
    }
`

const Chevron = (props) => (
    <StyledChevron
      closed={props.item.closed}
      onClick={() => props.openSubMenu(props.item.id)}
      className={props.icon}
    />
)

export default Chevron

jsx

import React from 'react'
import styled from 'styled-components'
import cssvars from '../../js/style/vars'
import Chevron from './Chevron'

const StyledHeader = styled.div`
    display: flex;
    align-items: center;
    padding: 11px;
    justify-content: space-between;
    background: ${cssvars.primaryColor};

    h2 {
        font-size: 19px;
        color: #fff;
        display: flex;
        align-items: center;
    }
`

const BackChevron = styled(Chevron)`
    padding: 0
`

const Header = (props) => (
    <StyledHeader>
        <h2>{props.item.title}</h2>
        <BackChevron {...props} icon="icon-arrow-left"/>
    </StyledHeader>
)

export default Header