将 Next.js v10.1.13 更新到 webpack5 时，收到警告 Can't resolve 'fsevents' in chokidar

Question

npm install next react react-dom 并运行 Node.js v12

创建最简单 pages/index.tsx

export default function PageHome(props) {
  return <>Hello World!</>
}

（我还按照Next.js 说明配置了 TypeScript，但不确定这是否有所作为。）

C:\GitHub\reproduce-nextjs-webpack5-error>npm run dev
...
event - compiled successfully
<w> [webpack.cache.PackFileCacheStrategy] Caching failed for pack: Error: Can't resolve 'fsevents' in 'C:\GitHub\reproduce-nextjs-webpack5-error\node_modules\next\node_modules\chokidar'
<w> while resolving 'fsevents' in C:\GitHub\reproduce-nextjs-webpack5-error\node_modules\next\node_modules\chokidar to a directory
<w> [webpack.cache.PackFileCacheStrategy] Caching failed for pack: Error: Can't resolve 'fsevents' in 'C:\GitHub\reproduce-nextjs-webpack5-error\node_modules\next\node_modules\chokidar'
<w> while resolving 'fsevents' in C:\GitHub\reproduce-nextjs-webpack5-error\node_modules\next\node_modules\chokidar to a directory

下面为未来的读者提供自我回答的解决方案。

Answer 1

1. 升级 Node.js

2. 删除package-lock.json和node_modules

3. npm install再次运行

4. 有用

   • 显然，当您使用较旧的 Node.js 版本运行时，不会安装某些东西。

   • 我的package.json样子

     {
       "scripts": {
         "dev": "next dev",
         "build": "next build",
         "start": "next start"
       },
       "dependencies": {
         "next": "^10.1.3",
         "react": "^17.0.2",
         "react-dom": "^17.0.2"
       },
       "devDependencies": {
         "@types/react": "^17.0.3",
         "typescript": "^4.2.4"
       }
     }
     

   • 同样package.json将安装略有不同，因为我只是观察到Node.js的V12切换到Node.js的V15。这就是为什么您不仅要完成第 1 步，还要完成第 2 步和第 3 步。

前：

C:\GitHub\reproduce-nextjs-webpack5-error>node --version
v12.4.0

C:\GitHub\reproduce-nextjs-webpack5-error>npm run dev

> @ dev C:\GitHub\reproduce-nextjs-webpack5-error
> next dev

ready - started server on 0.0.0.0:3000, url: http://localhost:3000
info  - Using webpack 5. Reason: future.webpack5 option enabled https://nextjs.org/docs/messages/webpack5
event - compiled successfully
<w> [webpack.cache.PackFileCacheStrategy] Caching failed for pack: Error: Can't resolve 'fsevents' in 'C:\GitHub\reproduce-nextjs-webpack5-error\node_modules\next\node_modules\chokidar'
<w> while resolving 'fsevents' in C:\GitHub\reproduce-nextjs-webpack5-error\node_modules\next\node_modules\chokidar to a directory

后：

C:\GitHub\reproduce-nextjs-webpack5-error>node --version
v15.14.0

C:\GitHub\reproduce-nextjs-webpack5-error>npm run dev

> dev
> next dev

ready - started server on 0.0.0.0:3000, url: http://localhost:3000
info  - Using webpack 5. Reason: future.webpack5 option enabled https://nextjs.org/docs/messages/webpack5
event - compiled successfully
event - build page: /
wait  - compiling...
event - compiled successfully

好极了！没有警告！

虽然下面有关于nextjs@canary.