找不到模块：无法解析“apollo-link-context”-REACT，APOLLO-SERVER

Posted 2023-03-10

【中文标题】找不到模块：无法解析“apollo-link-context”-REACT，APOLLO-SERVER

【英文标题】：Module not found: Can't resolve 'apollo-link-context' - REACT, APOLLO-SERVER

【发布时间】：2020-05-20 04:30:13

【问题描述】：

我有一个想要在我的前端文件夹中显示的用户的后端。 为此，我需要通过 Apollo Server 在 React 中实现授权标头。

我遵循了这里的一些指示 -> https://www.apollographql.com/docs/react/networking/authentication/

这是我在 App.js 中的代码

import React from 'react';
import HeroesDota from './components/HeroesDota';


import  ApolloProvider  from '@apollo/react-hooks';

import  ApolloClient  from "apollo-client";
import  InMemoryCache  from "apollo-cache-inmemory";
import  HttpLink  from "apollo-link-http";
import  setContext  from 'apollo-link-context';


const httpLink = new HttpLink(
  uri: "http://localhost:8000/graphql/",
);


const client = new ApolloClient(
  link: authLink.concat(httpLink),
  cache: new InMemoryCache()
);

const authLink = setContext((_,  headers ) => 
  // get the authentication token from local storage if it exists
  const token = localStorage.getItem('token');
  // return the headers to the context so httpLink can read them
  return 
    headers: 
      ...headers,
      authorization: token ? `Bearer $token` : "",
    
  
);

const App = () => 
return (
    <ApolloProvider client=client>
      <HeroesDota />
    </ApolloProvider>
);

export default App;

我在 localhost:3000 上运行服务器后，它说：未捕获的错误：找不到模块'apollo-link-context'

我安装了 apollo-link 作为依赖项。我不知道为什么会出现这个错误。这是实际图片。

package.json

  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "dependencies": 
    "@apollo/react-hooks": "^3.1.3",
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.4.0",
    "@testing-library/user-event": "^7.2.1",
    "apollo-boost": "^0.4.7",
    "apollo-cache-inmemory": "^1.6.5",
    "apollo-link": "^1.2.13",
    "apollo-link-ws": "^1.0.19",
    "bootstrap": "^4.4.1",
    "graphql": "^14.5.8",
    "react": "^16.12.0",
    "react-apollo": "^3.1.3",
    "react-bootstrap": "^1.0.0-beta.16",
    "react-dom": "^16.12.0",
    "react-router": "^5.1.2",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.3.0",
    "styled-components": "^5.0.0",
    "subscriptions-transport-ws": "^0.9.16"
  ,
  "scripts": 
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  ,
  "eslintConfig": 
    "extends": "react-app"
  ,
  "browserslist": 
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  ,
  "devDependencies": 

【参考方案1】：

你正在这里导入它：

import  setContext  from 'apollo-link-context';

请运行npm i apollo-link-context 进行修复。

【讨论】：

请分享你的 package.json

我不能。请运行npm i apollo-link-context。您需要安装apollo-link-context 而不仅仅是apollo-link。