我是laravel的新手，现在我正试图创建一个项目，并且我想运行npm run watch的命令，但是它给了我错误。在网上寻找答案，但无济于事。
> @ watch C:\Users\ZARI\Desktop\motelproj
> npm run development -- --watch
> @ development C:\Users\ZARI\Desktop\motelproj
> cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js "--watch"
One CLI for webpack must be installed. These are recommended choices, delivered as separate packages:
- webpack-cli (https://github.com/webpack/webpack-cli)
The original webpack full-featured CLI.
We will use "yarn" to install the CLI via "yarn add -D".
Do you want to install 'webpack-cli' (yes/no): yes
Installing 'webpack-cli' (running 'yarn add -D webpack-cli')...
'yarn' is not recognized as an internal or external command,
operable program or batch file.
undefined
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ development: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js "--watch"`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ development script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.