如何为Apollo的React HOC定义道具界面?

时间:2017-06-04 16:01:11

标签: reactjs typescript react-apollo

我正在尝试使用Apollo的React HOC来获取数据并将数据传递给我的组件,但我收到的错误是:

Argument of type 'typeof BrandList' is not assignable to parameter of type 
'CompositeComponent<{ data?: QueryProps | undefined; mutate?: MutationFunc<{}> | undefined; }>'.
Type 'typeof BrandList' is not assignable to type 'StatelessComponent<{ data?: 
QueryProps | undefined; mutate?: MutationFunc<{}> | undefined; }>'.
Type 'typeof BrandList' provides no match for the signature '(props: { data?: 
QueryProps | undefined; mutate?: MutationFunc<{}> | undefined; } & { children?: ReactNode; }, context?: any): ReactElement<any>'.

我的文件如下:

import * as React from 'react'
import {graphql} from 'react-apollo'
import gql from 'graphql-tag'

const BrandsQuery = gql`
  query {
    allBrands {
      id
      name
    }
  }
`

interface IBrand {
  id: string
  name: string
}

interface IData {
  loading: boolean,
  allBrands: IBrand[]
}

interface IProps {
  data: IData
}

class BrandList extends React.Component<IProps, void> {
  public render () {
    const {loading, allBrands} = this.props.data

    if (loading) {
      return (
        <div>Loading data..</div>
      )
    }

    return (
      <div>
        {allBrands.map((brand) => (
          <li>{brand.id} - {brand.name}</li>
        ))}
      </div>
    )
  }
}

export default graphql(BrandsQuery)(BrandList)
                                    ^^^^^^^^^

如果我使用{}代替接口,代码会编译,但我无法在render函数中使用任何道具。

编辑:

我试图将最后一行重写为

export default graphql<any, IProps>(BrandsQuery)(BrandList)

摆脱了错误,但现在当我尝试将组件包含为

<div>
    <BrandList />
</div>

我收到以下错误:

Type '{}' is not assignable to type 'Readonly<IProps>'.
Property 'data' is missing in type '{}'.

1 个答案:

答案 0 :(得分:1)

好的,我已经解决了这个问题..我不得不添加另一个Props接口

interface IExternalProps {
  id: string
}

interface IProps extends IExternalProps {
  data: IData
}

export default graphql<any, IExternalProps}>(BrandsQuery)(BrandList)

基本上,IExternalProps是您的组件从外部期望的道具的接口,即。当您在JSX中实际使用该组件时,IProps是您通过GraphQL查询(HOC)接收的道具的接口。此接口必须扩展IExternalProps,Typescript然后有机会实际键入检查它。

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