cypress/system-tests/projects/webpack-preprocessor/package.json

{
  "name": "@test-project/webpack-preprocessor",
  "version": "0.0.0-test",
  "devDependencies": {
    "@babel/core": "7.9.0",
    "@babel/preset-env": "7.9.0",
    "@cypress/webpack-preprocessor": "file:../../../npm/webpack-preprocessor",
    "babel-loader": "8.1.0"
  }
}