如何使用 React 和 TypeScript 创建通用箭头函数

Question

我正在尝试为 apollo graphql 结果创建一个通用包装器组件。我希望这个包装器等待查询成功完成，然后呈现一个传递给道具的组件。传入的组件应该具有 QueryResult<T>.

类型的道具

这个代码片段让我在 Col 66 上出错说

Cannot find name 'T'.ts(2304)

import React from 'react';
import { QueryResult } from 'react-apollo';
import { useSandboxContext } from 'src/js/shared/components/SandboxContext';
import { ErrorContent } from 'src/js/shared/components/ErrorContent';
import { PageSpinner } from 'src/js/shared/components/PageSpinner';

interface WrapperComponentProps<T> extends QueryResult<T> {
  // TODO: figure out how to specify that the wrapped component takes the results
  // Something like this `React.ReactType<QueryResult<T>>` but this causes errors
  wrappedComponent: React.ReactType;
}

// Getting an error from `React.FC<WrapperComponentProps<T>>`
// `Cannot find name 'T'.ts(2304)`
export const ApolloResultWrapper: React.FC<WrapperComponentProps<T>> = <T extends object>(props: WrapperComponentProps<T>) => {
  const sandbox = useSandboxContext();

  if (props.error) {
    sandbox.logger.error('query failed', props.error);

    return <ErrorContent />
  }
  if (props.loading) {
    return <PageSpinner />;
  }

  if (!props.data) {
    return <ErrorContent />
  }

  // TODO: figure out how to spread all the props except wrappedComponent
  return <props.wrappedComponent {...props} wrappedComponent={undefined} />;
}

Answer 1

如果错误是关于 <T extends object> 的地方，请尝试将类型转换 <T extends object> 更改为 .... as T extends object

https://www.typescriptlang.org/docs/handbook/jsx.html#the-as-operator

Answer 2

终于解决了问题

interface WrappedComponentProps<T> {
  data: T
}

interface WrapperComponentProps<T, K> {
  apolloResult: QueryResult<T>;
  wrappedComponent: React.ComponentType<WrappedComponentProps<T> & K>;
  componentProps: Omit<K, keyof WrappedComponentProps<T>>;
}

type ComponentProps<T, K> = React.PropsWithChildren<WrapperComponentProps<T, K>>;

export const ApolloResultWrapper = <T extends object, K = {}>(props: ComponentProps<T, K>) => {
  const sandbox = useSandboxContext();

  if (props.apolloResult.error) {
    sandbox.logger.error('stuff broke', props.apolloResult.error);

    return <ErrorContent />
  }
  if (props.apolloResult.loading) {
    return <PageSpinner />;
  }
  if (!props.apolloResult.data) {
    return <ErrorContent />
  }

  return <props.wrappedComponent
    children={props.children}
    data={props.apolloResult.data}
    {...props.componentProps as K}
  />;
}

如何使用 React 和 TypeScript 创建通用箭头函数

How to create a generic arrow function with react and typescript

reactjs

typescript

generics

react-apollo

react-functional-component