I've been working on npm build scripts to support my web development projects and finally came up with a series of scripts that cover my basic build requirements. This is a test file that I created. It isn't the most elegant set of scripts (or particularly feature-rich) but they're a start.

package.json build scripts

{
  "name": "css-node_imports",
  "version": "1.0.0",
  "description": "",
  "main": "index.html",
  "scripts": {
    "build": "npm run-script clean && npm run-script css && npm run-script files && npm run-script js",
    "clean": "trash dist/**",
    "postclean": "mkdir dist/ && mkdir dist/assets/",
    "precss": "mkdir dist/assets/styles/",
    "css": "cat app/assets/styles/modules/*.css | postcss --no-map -u postcss-cssnext > dist/assets/styles/styles.css",
    "prefiles": "mkdir dist/assets/images/",
    "files": "cp app/*.html dist/ && cp app/assets/images/** dist/assets/images/",
    "prejs": "mkdir dist/assets/scripts/",
    "js": "browserify app/assets/scripts/scripts.js | uglifyjs -c > dist/assets/scripts/scripts.js"
  },
  "author": "Paul Jacobson",
  "license": "MIT",
  "dependencies": {
    "autoprefixer": "^7.1.6",
    "normalize.css": "^7.0.0",
    "postcss": "^6.0.14",
    "postcss-cli": "^4.1.1",
    "postcss-import": "^11.0.0"
  },
  "devDependencies": {
    "postcss-cssnext": "^3.0.2",
    "uglifyify": "^4.0.4"
  }
}