Npm as a task runner

{
  "name": "npm-task-runner-example",
  "version": "0.0.1",
  "description": "",
  "main": "index.js",
  "scripts": {
    "clean": "rimraf dist && mkdirp dist/css",
    "prebuild": "npm run clean",
    "build:js": "node tasks/build/js.js",
    "watch:js": "watch 'npm run build:js' assets/js",
    "build:img": "imagemin --progressive assets/img dist/img",
    "watch:img": "watch 'npm run build:img' assets/img",
    "build:css": "node-sass assets/scss/ --output dist/css/ --output-style compressed",
    "watch:css": "node-sass assets/scss/ --output dist/css/ --output-style compressed --watch",
    "build:html": "jade --pretty --out dist assets/html/*.jade",
    "watch:html": "jade --pretty --out dist assets/html/*.jade --watch",
    "build:favicon": "cp assets/root/* dist/",
    "build": "npm run build:favicon && npm run build:js && npm run build:img && npm run build:css && npm run build:html",
    "watch": "concurrent --kill-others 'npm run watch:js' 'npm run watch:img' 'npm run watch:css' 'npm run watch:html'",
    "serve": "http-server -p 9090 dist/",
    "open:dev": "opener http://localhost:9090",
    "dev": "npm run build && concurrent --kill-others 'npm run serve' 'npm run watch' 'npm run open:dev'",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "rayrutjes <raymond.rutjes@gmail.com>",
  "license": "MIT",
  "dependencies": {},
  "devDependencies": {
    "concurrently": "^0.1.1",
    "foundation-sites": "^5.5.3",
    "http-server": "^0.8.5",
    "imagemin-cli": "^2.0.0",
    "jade": "^1.11.0",
    "mkdirp": "^0.5.1",
    "node-sass": "^3.4.1",
    "opener": "^1.4.1",
    "rimraf": "^2.4.3",
    "uglify-js": "^2.5.0",
    "watch": "^0.16.0"
  }
}