javascript - Next.js 不加载 jsx

Question

一直在搜索当下的javascript框架Next.js，想开始实践。问题是:它无论如何都无法在我的计算机上运行。

创建下一个项目的自然形式是使用命令行:

npx create-next-app

或

yarn create next-app

结果是一个具有文件结构和一些用于运行服务器的脚本的模板项目。最基本的脚本以开发模式运行服务器:

npm run dev

或

yarn dev

终端的结果是警告:

$ yarn dev
yarn run v1.22.5
$ next dev
(node:5348) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution
 of the package at C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\node_modules\postcss\package.json.
Update this package.json to use a subpath pattern like "./*".
(Use `node --trace-deprecation ...` to show where the warning was created)
ready - started server on http://localhost:3000
error - C:/Users/maths/Documents/codigos/node/my-app/pages/_app.js 4:9
Module parse failed: Unexpected token (4:9)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. S
ee https://webpack.js.org/concepts#loaders
|
| function MyApp({ Component, pageProps }) {
>   return <Component {...pageProps} />
| }
|

当我在 localhost:3000 中输入网站时，浏览器页面显示:

Internal Server Error

从浏览器发起http请求后，终端显示如下信息:

event - build page: /next/dist/pages/_error
wait  - compiling...
error - C:/Users/maths/Documents/codigos/node/my-app/pages/_app.js 4:9
Module parse failed: Unexpected token (4:9)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. S
ee https://webpack.js.org/concepts#loaders
|
| function MyApp({ Component, pageProps }) {
>   return <Component {...pageProps} />
| }
|
Error: Cannot find module 'C:\Users\maths\Meus Documentos\codigos\node\my-app\.next\server\pages-manifest.json'
Require stack:
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\require.js
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\load-components.js
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\api-utils.js
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\next-server.js
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\server\next.js
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\server\lib\start-server.js
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\cli\next-dev.js
- C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\bin\next
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:925:15)
    at Function.Module._load (node:internal/modules/cjs/loader:769:27)
    at Module.require (node:internal/modules/cjs/loader:997:19)
    at require (node:internal/modules/cjs/helpers:92:18)
    at getPagePath (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\require.js:1:
657)
    at requirePage (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\require.js:1:
1062)
    at loadComponents (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\load-compo
nents.js:1:807)
    at DevServer.findPageComponents (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\ser
ver\next-server.js:74:296)
    at DevServer.renderErrorToHTML (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\serv
er\next-server.js:126:120)
    at DevServer.renderErrorToHTML (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\server\next-dev-
server.js:34:974)
    at processTicksAndRejections (node:internal/process/task_queues:93:5)
    at async DevServer.render (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\ne
xt-server.js:72:236)
    at async Object.fn (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\next-serv
er.js:56:618)
    at async Router.execute (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\rout
er.js:23:67)
    at async DevServer.run (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\server\next-
server.js:66:1042)
    at async DevServer.handleRequest (C:\Users\maths\Documents\codigos\node\my-app\node_modules\next\dist\next-server\se
rver\next-server.js:34:1081) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\next-server\\server\\require.js',
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\next-server\\server\\load-components.
js',
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\next-server\\server\\api-utils.js',
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\next-server\\server\\next-server.js',
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\server\\next.js',
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\server\\lib\\start-server.js',
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\cli\\next-dev.js',
    'C:\\Users\\maths\\Documents\\codigos\\node\\my-app\\node_modules\\next\\dist\\bin\\next'
  ]
}

我已经尝试了几种方法来修复它，在没有 npx 和 yarn 脚本的情况下创建下一个项目(通过手动安装依赖项)，更新 Node 和 npm 的版本等。程序似乎无法加载jsx，第一个错误指向第一个jsx组件出现在代码中的时刻。该消息表示 webpack 未配置此代码的有效加载器。

环境:

• 赢 10
• npm v7.3.0
• Node v15.5.0
• 下一个 v10.0.4
• react v17.0.1
• react-dom v17.0.1

Answer 1

将您的 Nodejs 版本降级到 14 或 12 Node 版本 15 会破坏您的环境。如果您仍然想使用 15 获取 Node 版本切换器并根据您正在处理的项目切换版本。