vue项目配置ts后，没办法用extentions

Question

本人自自己用webpack构建vue项目，然后加入ts，但是webpack没办法再配置extentions了，有大神知道为什么吗
✖ ｢wds｣: Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.

• configuration has an unknown property 'extensions'. These properties are valid:
  object { amd?, bail?, cache?, context?, dependencies?, devServer?, devtool?, entry?, externals?, infrastructureLogging?, loader?, mode?, module?, name?, node?, optimization?, output?, parallelism?, performance?, plugins?, profile?, recordsInputPath?, recordsOutputPath?, recordsPath?, resolve?, resolveLoader?, serve?, stats?, target?, watch?, watchOptions? }
  For typos: please correct them.
  For loader options: webpack >= v2.0.0 no longer allows custom properties in configuration.

  Loaders should be updated to allow passing options via loader options in module.rules.
  Until loaders are updated one can use the LoaderOptionsPlugin to pass these options to the loader:
  plugins: [
    new webpack.LoaderOptionsPlugin({
      // test: /\.xxx$/, // may apply this only for some modules
      options: {
        extensions: …
      }
    })