Laravel 5.6+Bootstrap项目执行npm run dev报错求助

Hey there, that cross-env: not found error is a super common hiccup when working with Laravel Mix. Let's break down how to fix it quickly:

Why this happens #

When you run npm run dev, Laravel Mix relies on the cross-env package to set your NODE_ENV environment variable. The error means this package either wasn't installed at all, or the installation got corrupted along the way.

Step-by-step fixes #

• First, do a clean reinstall of dependencies
  Sometimes the node_modules folder or lock files get messed up. Run these commands in your project root:

  rm -rf node_modules package-lock.json
  npm install
  

  If you use Yarn instead, swap out the last command with yarn install.

• If clean install doesn't work, manually install cross-env
  Force-install the package as a development dependency:

  npm install cross-env --save-dev
  

  For Yarn users, use this instead: yarn add cross-env --dev

• Try running the dev command again
  Once the installation finishes, fire up the dev script again:

  npm run dev
  

Quick note for Linux/macOS users #

If you hit permission errors during installation, you can try running the commands with sudo (e.g., sudo npm install), but it's better to fix your npm permissions long-term to avoid relying on sudo for package installs.

内容的提问来源于stack exchange，提问作者user2339232