title: npm run scripts runs infinite amounts of time
body: <p>I have scss files which I want to convert to css then run autoprefixer, then minify the whole thing.</p>
  
  <p>I came to this code:</p>
  
  <pre><code>"devDependencies": {
      "autoprefixer": "^9.7.2",
      "cssnano": "^4.1.10",
      "node-sass": "^4.13.0",
      "npm-run-all": "^4.1.5",
      "postcss": "^7.0.23",
      "postcss-cli": "^6.1.3",
      "watch": "^1.0.2"
    },
    "scripts": {
      "scss": "node-sass -o www/css src/scss",
      "prefix": "postcss --use autoprefixer -b 'last 2 versions' &lt; www/css/websiteStyles.css | postcss --use cssnano &gt; www/css/websiteStyles.min.css",
      "dev": "npm-run-all scss prefix",
      "watch" : "watch 'npm run dev'"
    },
  </code></pre>
  
  <p>When I run <code>npm run watch</code> the script runs infinitely. I don't change anything but the script runs and runs and then runs ageain. What did I do wrong?</p>