next.js - 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 instructions 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 future 的读者提供自我回答的解决方案。

Answer 1

升级 Node.js

删除 package-lock.json和 node_modules

运行 npm install再次

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看起来像

{
  "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package.json正如我刚刚观察到的那样，从 Node.js v12 切换到 Node.js v15 的安装略有不同。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 中 future 变化的评论，上面的例子对我有用，列出了版本。