[英]How to return Generic Type in arrow function React-TypeScript
[英]How to create a generic arrow function with react and typescript
我正在嘗試為 apollo graphql 結果創建一個通用包裝器組件。 我希望這個包裝器等待查詢成功完成,然后呈現一個傳遞給道具的組件。 傳入的組件應該具有QueryResult<T>
類型的道具。
這個代碼片段在 Col 66 上給了我一個錯誤說
找不到名稱“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} />;
}
如果錯誤是關於<T extends object>
的地方嘗試將類型轉換<T extends object>
更改為.... as T extends object
https://www.typescriptlang.org/docs/handbook/jsx.html#the-as-operator
終於設法解決了問題
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}
/>;
}
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