webpack4 + TypeScript + SCSS構成

package.json

{
  "name": "shoppingapp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "webpack:dev": "webpack --mode development",
    "webpack:prod": "webpack --mode production"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "autoprefixer": "^9.1.0",
    "css-loader": "^1.0.0",
    "mini-css-extract-plugin": "^0.4.1",
    "node-sass": "^4.9.2",
    "postcss-loader": "^2.1.6",
    "sass-loader": "^7.1.0",
    "ts-loader": "^4.4.2",
    "typescript": "^3.0.1",
    "webpack": "^4.16.4",
    "webpack-cli": "^3.1.0"
  }
}