the project structure is like this 
 now I want to use the configuration file in build, how should I write it in packagejson 
  
 
//package.json
{
  "name": "vuewebpack4",
  "version": "1.0.0",
  "description": "vue+webpack4",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack --config webpack.config.js"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "css-loader": "^0.28.11",
    "extract-text-webpack-plugin": "^3.0.2",
    "html-webpack-plugin": "^3.2.0",
    "vue": "^2.5.16",
    "vue-loader": "^14.0.3",
    "vue-template-compiler": "^2.5.16",
    "webpack": "^4.8.2",
    "webpack-cli": "^2.1.3",
    "webpack-merge": "^4.1.2"
  }
}