fix: remove for cypress config

Fixes vuejs#2903

Author: cexbrayat

packages/@vue/cli-plugin-e2e-cypress/generator/template/tests/e2e/plugins/index.js

@@ -1,12 +1,18 @@
 // https://docs.cypress.io/guides/guides/plugins-guide.html
-/* eslint-disable import/no-extraneous-dependencies, global-require */
-const webpack = require('@cypress/webpack-preprocessor')
+
+// if you need a custom webpack configuration you can uncomment the following import
+// and then use the `file:preprocessor` event
+// as explained in the cypress docs
+// https://docs.cypress.io/api/plugins/preprocessors-api.html#Examples
+
+// /* eslint-disable import/no-extraneous-dependencies, global-require */
+// const webpack = require('@cypress/webpack-preprocessor')
 
 module.exports = (on, config) => {
-  on('file:preprocessor', webpack({
-    webpackOptions: require('@vue/cli-service/webpack.config'),
-    watchOptions: {}
-  }))
+  // on('file:preprocessor', webpack({
+  //  webpackOptions: require('@vue/cli-service/webpack.config'),
+  //  watchOptions: {}
+  // }))
 
   return Object.assign({}, config, {
     fixturesFolder: 'tests/e2e/fixtures',