解决nuxt/koa架构初始项目运行报错问题

今天在学习运用vue的nuxt/koa框架，初始化项目之后，在执行 $> npm run dev 时报错，错误详细信息如下：

点击查看报错的详细内容

> npm run dev
Debugger attached.

> ice@1.1.0 dev
> backpack dev

Debugger attached.
Debugger attached.

 ERROR  Failed to compile with 1 errors                                                           下午5:52:10
 error  in ./server/index.js

Module build failed: Error: Plugin/Preset files are not allowed to export objects, only functions. In E:\Vue\***\node_modules\backpack-core\babel.js
    at createDescriptor (E:\Vue\***\node_modules\@babel\core\lib\config\config-descriptors.js:196:11)
    at createDescriptor.next (<anonymous>)
    at step (E:\Vue\***\node_modules\gensync\index.js:261:32)
    at E:\Vue\***\node_modules\gensync\index.js:273:13
    at async.call.result.err.err (E:\Vue\***\node_modules\gensync\index.js:223:11)

Debugger attached.
Waiting for the debugger to disconnect...
node:internal/modules/cjs/loader:936
  throw err;
  ^

先是找到了出错的模块文件的那行代码，发现是官方包，那第一个想到的肯定是版本不一致。所以先把backpack包的版本升级到了0.7.0，即运行命令：

npm install backpack-core@0.7.0

然后运行一次 npm run dev, 发现问题依然存在：

点击查看Error信息

Error: Cannot find module 'E:\Vue\build\main.js'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}
Waiting for the debugger to disconnect...

好烦，还是没解决问题。看报错信息的意思是 Plugin/Preset files are not allowed to export objects, only functions.

最后，根据这个报错信息在网上找到了类似问题的解决办法，修改nuxt.config.js中如下配置代码：

点击查看代码

    /*
     ** Run ESLINT on save
     */
    extend (config, ctx) {
      // if (ctx.isClient) { //将原来生成的这行注释，改为下行的判断即可
      if(ctx.Client&&ctx.isDev) {
        config.module.rules.push({
          enforce: 'pre',
          test: /\.(js|vue)$/,
          loader: 'eslint-loader',
          exclude: /(node_modules)/
        })
      }
    }

再次运行，终于跑起来了。

点击查看运行结果

> npm run dev
Debugger attached.

> ice@1.1.0 dev
> backpack dev

Debugger attached.
Debugger attached.

 DONE  Compiled successfully in 3219ms                                                            下午5:53:46

Debugger attached.
i Preparing project for development                                                                17:53:59
i Initial build may take a while                                                                   17:53:59

i NuxtJS collects completely anonymous data about usage.                                           17:54:03
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  Read more on https://git.io/nuxt-telemetry

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√ Builder initialized                                                                              17:54:14
√ Nuxt files generated                                                                             17:54:14  

√ Client
  Compiled successfully in 10.45s

√ Server
  Compiled successfully in 9.59s

i Waiting for file changes                                                                         17:54:32
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