Express server rendered app with Pug and SCSS

package.json

{
  "name": "express-pug-scss-starter",
  "version": "1.0.0",
  "description": "Express server rendered app with Pug and SCSS",
  "main": "server.js",
  "config": {
    "app": "server.js",
    "scss": "./src/scss",
    "css": "./dist/css",
    "img_src": "./src/img/",
    "img_dist": "./dist/img/",
    "img_extensions": "svg,png,jpg,jpeg"
  },
  "scripts": {
    "start": "node $npm_package_config_app",
    "dev": "concurrently --kill-others --names \"SERVE,SCSS,IMAGES\" -c \"bgRed.bold,black.bgYellow.dim,bgMagenta.bold\" \"npm run serve:dev\" \"npm run watch:css\" \"npm run watch:img\"",
    "build": "concurrently --names \"CSS,IMAGES\" -c \"bgRed.bold,black.bgYellow.dim\" \"npm run build:css\" \"npm run build:img\"",
    "build:css": "node-sass $npm_package_config_scss -o $npm_package_config_css",
    "build:img": "mkdir -p $npm_package_config_img_dist && cp -r $npm_package_config_img_src $npm_package_config_img_dist",
    "watch:css": "npm run build:css && node-sass --watch --recursive $npm_package_config_scss -o $npm_package_config_css --source-map true",
    "watch:img": "nodemon -w $npm_package_config_img_src --exec npm run build:img --ext $npm_package_config_img_extensions",
    "serve:dev": "nodemon $npm_package_config_app",
    "coverage": "npm t -- --runInBand --coverage",
    "lint": "semistandard './src/**/*.js' --verbose | snazzy",
    "lint:fix": "semistandard --fix --verbose | snazzy",
    "format": "prettier-semi --write '{,!(node_modules)/**/}*.js'",
    "format:single": "prettier-semi --write"
  },
  "author": "Kite",
  "dependencies": {
    "axios": "^0.18.0",
    "compression": "^1.7.3",
    "express": "^4.16.3",
    "helmet": "^3.12.1",
    "morgan": "^1.9.0",
    "pug": "^2.0.3",
    "winston": "^3.0.0"
  },
  "devDependencies": {
    "browser-sync": "^2.24.6",
    "concurrently": "^3.6.0",
    "jest": "^23.3.0",
    "node-sass": "^4.9.2",
    "nodemon": "^1.17.4",
    "prettier-semi-cli": "^1.0.0",
    "snazzy": "^7.0.0",
    "supertest": "^3.1.0"
  },
  "engines": {
    "node": "10",
    "npm": "6"
  },
  "semistandard": {
    "globals": [
      "describe",
      "test",
      "jest",
      "beforeEach",
      "afterEach",
      "beforeAll",
      "afterAll",
      "expect",
      "fail"
    ]
  },
  "jest": {
    "testRegex": ".*spec.js$",
    "moduleFileExtensions": [
      "js"
    ],
    "collectCoverageFrom": [
      "**/*.js",
      "!config/**",
      "!src/app.js",
      "!server.js",
      "!**/node_modules/**",
      "!**/*/index.js"
    ]
  },
  "nodemonConfig": {
    "ignore": [
      "*.spec.js"
    ],
    "watch": [
      "./src"
    ]
  }
}

server.js

const express = require('express');
const app = require('./src/app');

app.use('/public', express.static('dist'));

const PORT = process.env.PORT || 3000;

app.listen(PORT, () => {
  console.log('Server listening on port', PORT);
  if (process.env.NODE_ENV !== 'production') {
    console.log('Proxying on port', PORT + 1);
    require('browser-sync')({
      files: ['src/**/*.{pug}', 'dist/**/*'],
      online: false,
      open: false,
      port: PORT + 1,
      proxy: 'localhost:' + PORT,
      ui: false
    });
  }
});

process.on('SIGINT', () => {
  // This is to avoid EADDRINUSE issues with Nodemon
  console.log('Exiting');
  process.exit();
});