webpack.IngorePlugin failure with webpackMissingModule

[rictt]

Bug report

What is the current behavior?
I have the folling config, i trying to ignore some file(module) for reduce build time.

// webpack.config.js
module.exports = {
  mode: "none",
  entry: "./src/index.js",
  output: {
    filename: "bundle.js"
  },
  resolve: {
    alias: {
      '@': path.join(__dirname, './src')
    }
  },
  devtool: 'eval-source-map',
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader'
        ]
      }
    ]
  },
  plugins: [
    new webpack.IgnorePlugin({
      // ingore file end with a or b 
      resourceRegExp: /a|b\.js$/
    })
  ]
}

// src/index.js
import "@/a"
import "./index.css"

// src/a.js
console.log('aaaaa')

and then i run build and preview index.html in the browser, i got the below result Cannot find module '@/a', seems like ignorePlugin works, but resolve failed.

In my opinion, I hope that when the plugin takes effect, the module parsing is removed and the project runs normally.

If the current behavior is a bug, please provide the steps to reproduce.

I not sure this is bug, may my demand is not match the ignorePlugin.

What is the expected behavior?

I hope that when the plugin takes effect, the module parsing is removed and the project runs normally

Other relevant information:
webpack version: 4.42.1
Node.js version: 12.22.7
Operating System: mac os
Additional tools: vscode

[rictt]

[alexander-akait]

Please use externals and provide empty module, we can't just remove import/require, because it is unsafe, feelf ree to feedback