所以我目前正在为反应上下文 API 编写一个 HOC,它将在上下文 api 消费者中包装组件。
我的要求是:
- 需要维护对道具的完整类型检查
- 我需要能够在将上下文 api 提供的状态作为道具添加之前对其进行子集化(这也需要完整的类型检查)
我目前拥有的代码是这样的(使用实用程序类型库):
特设:
export const withMainContext = <
T extends object,
X extends object,
Y = Intersection<Required<IAppContext>, X>,
Z = Diff<T, Required<IAppContext>>
>(
Component: React.ComponentType<T>,
subsetStateCallback: (state: IAppContext) => Y =
(state) => state as unknown as Y
): React.SFC<Z> => (props: Z) => {
return <AppContext.Consumer>
{(state: IAppContext) => {
const newState = subsetStateCallback(state)
return <Component {...props} {...newState}/>
}}
</AppContext.Consumer>
}
零件:
interface ItestOtherProps {
one: string;
two: number;
three: string;
}
type ItestAppProps = Required<Pick<IAppContext, 'workflows'>>
type ITestProps = ItestOtherProps & ItestAppProps
class Test extends React.Component<ITestProps, {}> {
public render(): JSX.Element {
return null
}
}
const Testy = withMainContext<ITestProps, ItestAppProps>(
Test,
(state: Required<IAppContext>): ItestAppProps => {return {workflows: state.workflows}}
)
const useTesty = () => {
return <Testy one={""} two={0} three={""}/>
}
Diff 和 Intersection 从实用程序类型导入并在此处定义: https ://github.com/piotrwitek/utility-types
如果我可以稍微简化一下,或者不必将状态转换为未知,然后在回调的默认值中将其设置为 Y,那就太棒了。
有任何想法吗?
谢谢!