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javascript - React Relay (react-relay) 与 Typescript 抛出 TypeError : Object prototype may only be an Object or null: undefined

转载 作者:行者123 更新时间:2023-12-03 03:42:52 28 4
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当我尝试实例化一个扩展Relay.Mutation的类时,我遇到了一个非常奇怪的react-relay类型错误。我使用 create-react-app my-app --scripts-version=react-scripts-ts 创建了一个简单的 Typescript 项目来演示该问题。

每当我运行yarn start时,我都会看到以下内容:

Relay.Mutation instantiation error

这个错误对我来说并没有什么意义:类型错误:对象原型(prototype)只能是一个对象或 null:未定义

我只是想实例化我自己的扩展 Relay.Mutation 类的新实例。总的来说,我对 React Relay 世界和 ES6/Typescript 还很陌生,所以我可能错过了一些愚蠢的东西。

在这个简单的项目中,我直接使用 DefinitelyTyped repository 中定义的示例类。 .

我不应该能够像这样使用这个类吗:

const atm = new AddTweetMutation({ text: 'asdf', userId: '1123' });

这是 AddTweetMutation.tsx 类的样子:

import * as Relay from 'react-relay';

interface Props {
text: string;
userId: string;
}

interface State {
}

export default class AddTweetMutation extends Relay.Mutation<Props, State> {

public getMutation() {
return Relay.QL`mutation{addTweet}`;
}

public getFatQuery() {
return Relay.QL`
fragment on AddTweetPayload {
tweetEdge
user
}
`;
}

public getConfigs() {
return [{
type: 'RANGE_ADD',
parentName: 'user',
parentID: this.props.userId,
connectionName: 'tweets',
edgeName: 'tweetEdge',
rangeBehaviors: {
'': 'append',
},
}];
}

public getVariables() {
return this.props;
}
}

这是整个 Hello.tsx React 组件:

import * as React from 'react';
import AddTweetMutation from '../mutations/AddTweetMutation';

export interface Props {
name: string;
enthusiasmLevel?: number;
}

class Hello extends React.Component<Props, {}> {
render() {

const atm = new AddTweetMutation({ text: 'asdf', userId: '1123' });
console.log(atm);

const { name, enthusiasmLevel = 1 } = this.props;

if (enthusiasmLevel <= 0) {
throw new Error('You could be a little more enthusiastic. :D');
}

return (
<div className="hello">
<div className="greeting">
Hello {name + getExclamationMarks(enthusiasmLevel)}
</div>
</div>
);
}
}

export default Hello;

// helpers

function getExclamationMarks(numChars: number) {
return Array(numChars + 1).join('!');
}

这就是我的 package.json 的样子:

{
"name": "my-app",
"version": "0.1.0",
"private": true,
"dependencies": {
"@types/jest": "^20.0.6",
"@types/node": "^8.0.19",
"@types/react": "^16.0.0",
"@types/react-dom": "^15.5.2",
"@types/react-relay": "^0.9.13",
"react": "^15.6.1",
"react-dom": "^15.6.1",
"react-relay": "^1.1.0",
"react-scripts-ts": "2.5.0"
},
"devDependencies": {},
"scripts": {
"start": "react-scripts-ts start",
"build": "react-scripts-ts build",
"test": "react-scripts-ts test --env=jsdom",
"eject": "react-scripts-ts eject"
}
}

Here's the project to github

更新:输入目前对于 React-relay > 1.x 无效。请参阅thread on github for this issue 。我还用解决方法更新了我的存储库。

最佳答案

问题在于 react-relay@1.1.0 已更改其 API,并且 @types/react-relay@0.9.13 已过时。

TypeScript 根据可用的类型(类型定义)静态分析您的代码。因此,即使您的 @types/react-relay@0.9.13 已经过时,TypeScript 也不知道,只是根据它采取行动。

要解决此问题,您可以:

对于最后一个选项,请执行以下操作:

// custom-typings/react-relay.d.ts
declare module 'react-relay'

// tsconfig.json
{
"include": [
"custom-typings"
]
}

关于javascript - React Relay (react-relay) 与 Typescript 抛出 TypeError : Object prototype may only be an Object or null: undefined,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45535641/

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