npm - 在我的 package.json 中使用 cssnano 脚本时权限被拒绝

Question

{
  "name": "pinhideout",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
      "dev": "postcss src/source.css -o wp-content/themes/pinhideout/css/style.css",
      "minfy": "cssnano wp-content/themes/pinhideout/css/style.css -o  wp-content/themes/pinhideout/css/style.min.css",
      "prod": " npm run dev && npm run minfy"
},
...

我这样做不对吗？是否有关于编写 package.json 脚本的文档？或者你能告诉我我做错了什么吗？