Node Watch/Compile CSS+JS Task Runner

package.json

{
    "name": "wp-mnml",
    "version": "1.0.0",
    "license": "MIT",
    "dependencies": {
        "autoprefixer": "*",
        "eslint": "*",
        "nodemon": "*",
        "npm-run-all": "*",
        "node-sass": "*",
        "rimraf": "*",
        "postcss": "*",
        "postcss-cli": "*",
        "uglify-js": "*"
    },
    "eslintConfig": {
        "env": {
            "es6": true,
            "node": true,
            "browser": true
        },
        "extends": "eslint:recommended",
        "rules": {
            "no-console": "off"
        }
    },
    "scripts": {
        "clean": "rimraf assets/{css/site.css,js/site.min.js}",
        "autoprefixer": "postcss -u autoprefixer --autoprefixer.browsers '> 0.5%', 'IE 9' -r assets/css/*",
        "js:uglify": "uglifyjs assets/js/site.js -m -o assets/js/site.min.js",
        "js:lint": "eslint assets/js/site.js",
        "sass": "node-sass --output-style compressed -o assets/css/ assets/scss/site.scss",
        "build:css": "npm-run-all sass autoprefixer",
        "watch:css": "nodemon --ext scss -x \"npm run build:css\"",
        "build:js": "npm-run-all js:lint js:uglify",
        "watch:js": "nodemon --ext js --ignore site.min.js -x \"npm run build:js\"",
        "build": "npm-run-all build:css build:js",
        "watch": "npm-run-all --parallel watch:css watch:js"
    }
}