样式化组件渲染触发元素类型错误 [英] Styled Component rendering triggers Element type error

问题描述

我刚刚安装了 styled-components 库并开始使用它.

但是这个简单的例子:

从 'react' 导入 React从样式组件"导入样式const Div = styled.div`背景:红色；`const AlertCard = () =>(<Div>Hello World</Div>)导出默认警报卡

和渲染函数:

render() {const { fetchingAlerts, alerts } = this.props返回 (获取警报 ?<装载机/>:<div><AlertFormContainer/><div>{alerts.length === 0 ?<EmptyAlerts/>:<div>{alerts.map(alert => (<AlertCard text="我的文字"/>))}

}

))}

触发此错误:错误:元素类型无效:应为字符串(对于内置组件)或类/函数(对于复合组件)但得到:对象.

样式化组件返回一个$$typeof的对象:Symbol(react.element)

我不知道出了什么问题

解决方案

您使用的是哪个版本的 React、React-Dom 和 Styled-Component?

确保 react 和 react-dom >=16.3.0 with styled-component >=4.0.0

在 styled-component v4 中使用新的 Context api 带来的重大变化需要 react >=16.3.0

请参阅 https://www.styled-components.com/docs/faqs#what-do-i-need-to-do-to-migrate-to-v4

I just installed the styled-components library and started playing with it.

However this simple example:

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

const Div = styled.div`background: red;`

const AlertCard = () => (
  <Div>Hello World</Div>
)
export default AlertCard

And the render function:

render() {
  const { fetchingAlerts, alerts } = this.props

  return (
    fetchingAlerts ? 
      <Loader /> :
      <div>
        <AlertFormContainer />
        <div>
          {alerts.length === 0 ?
            <EmptyAlerts /> :
            <div>
              {alerts.map(alert => (
                <AlertCard text="My text " />
              ))}
            </div>
          }
        </div>
      </div>
    )
  )
}

triggers this error: Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

The styled component returns an object of $$typeof: Symbol(react.element)

I don't know what goes wrong

解决方案

Which version of React, React-Dom and Styled-Component are you using?

Make sure that react and react-dom are >=16.3.0 with styled-component >=4.0.0

The breaking change brought upong the use of the new Context api in styled-component v4 requires react >=16.3.0

see point #2 on https://www.styled-components.com/docs/faqs#what-do-i-need-to-do-to-migrate-to-v4

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