[问题简单描述]

问题复现步骤:

这是我在移植 SPA 到 mpvue 的时候出现的，其它环境恐怕难以复现。

1. 运行 npm run dev

期望的表现:

不报错

观察到的表现:

出现一个报错，但是编译成功。

控制台输出：

TypeError: Cannot read property 'indexOf' of undefined
    at Resolver.parse (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\Resolver.js:181:28)
    at Resolver.<anonymous> (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\ParsePlugin.js:15:25)
    at Resolver.applyPluginsAsyncSeriesBailResult1 (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\tapable\lib\Tapable.js:256:13)
    at runNormal (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\Resolver.js:130:20)
    at Resolver.doResolve (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\Resolver.js:116:3)
    at Resolver.<anonymous> (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\UnsafeCachePlugin.js:37:12)
    at Resolver.applyPluginsAsyncSeriesBailResult1 (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\tapable\lib\Tapable.js:256:13)
    at runNormal (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\Resolver.js:130:20)
    at Resolver.doResolve (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\Resolver.js:116:3)
    at Resolver.resolve (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\enhanced-resolve\lib\Resolver.js:86:14)
    at resolve (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\webpack\lib\NormalModule.js:133:14)
    at Promise (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\@f-loat\mpvue-loader\lib\mp-compiler\index.js:254:7)
    at new Promise (<anonymous>)
    at Promise.all.Object.keys.map.k (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\@f-loat\mpvue-loader\lib\mp-compiler\index.js:253:12)
    at Array.map (<anonymous>)
    at resolveSrc (C:\Users\vimcaw\Documents\Work\kcshop-mpvue\node_modules\@f-loat\mpvue-loader\lib\mp-compiler\index.js:252:52)

进去源码后发现是 Resolver.prototype.parse 的参数 identifier 为 undefined 导致的，进一步到父级，发现 ParsePlugin.prototype.apply 函数处理到某项时 request.request 为 undefined ，输出这个 request 的值为：

{ 
  context: {},
  path: 'C:\\Users\\vimcaw\\Documents\\Work\\kcshop-mpvue\\src',
  request: undefined
}

屏幕截图和动态 GIF 图