NPM as a build tool. from: https://gablaxian.com/blog/using-npm-as-a-build-tool

npm.json

{
  "name":           "gablaxian",
  "version":        "1.0.0",
  "description":    "gablaxian website",
  "license":        "MIT",
  "repository": {
    "type":         "git",
    "url":          "git+https://github.com/gablaxian/gablaxian.com.git"
  },

  "devDependencies": {
    "del":              "latest",
    "imagemin-webp":    "latest",
    "node-sass":        "latest",
    "onchange":         "latest",
    "rollup":           "latest"
  },

  "scripts": {
    "clean":            "rm -rf source/assets && mkdir source/assets",
    
    "fonts":            "cp -rf assets/fonts source/assets",
    
    "images":           "cp -rf assets/img source/assets",
    "webp:png":         "for file in assets/img/**/*.png; do ./node_modules/.bin/cwebp -lossless -q 80 $file -o source/$file.webp -short; done;",
    "webp:jpg":         "for file in assets/img/**/*.jpg; do ./node_modules/.bin/cwebp -q 80 $file -o source/$file.webp -short; done;",
    "webp:gif":         "for file in assets/img/**/*.gif; do gif2webp $file -o source/$file.webp; done;",
    "webp":             "npm run webp:png & npm run webp:jpg & npm run webp:gif",
    
    "sass":             "node-sass --output-style=compressed --source-map=true --output=source/assets/css/ assets/sass/build.scss source/assets/css/main.css && npm run stats:css",
    
    "serviceWorker":    "cp -f assets/js/ServiceWorker.js source/ServiceWorker.js",
    "rollup":           "rollup -c -f es && npm run stats:js",
    
    "stats:css":        "echo \"Size of main.css is $(stat -c%s \"source/assets/css/main.css\") bytes ($(gzip -c source/assets/css/main.css | wc -c) bytes gzipped)\"",
    "stats:js":         "echo \"Size of main.js is $(stat -c%s \"source/assets/js/main.js\") bytes ($(gzip -c source/assets/js/main.js | wc -c) bytes gzipped)\"",
    "stats":            "npm run stats:css && npm run stats:js",
    
    "init":             "npm run fonts & npm run images & npm run sass & npm run serviceWorker & npm run rollup & npm run webp",
    
    "build":            "npm run clean && npm run init && npm run stats",
    "build:watch":      "onchange 'assets/sass/**/*.scss' -- npm run sass"
  }
}

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