ارور در اجرا لاراول میکس

سلام وقت بخیر من وقتی دستور npm run dev رو میزنم ارور میگیرم دارم از لاراول میکس تو پروژه لاراولیم استفاده میکنم
لاراول نسخه 8.5 هست

C:\wamp\www\shop>npm run dev

> dev
> npm run development

> development
> mix

'mix' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code 1
npm ERR! path C:\wamp\www\shop
npm ERR! command failed
npm ERR! command C:\Windows\system32\cmd.exe /d /s /c "mix"

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\VAHIID_PC\AppData\Local\npm-cache\_logs\2021-01-27T17_14_37_962Z-debug.log
npm ERR! code 1
npm ERR! path C:\wamp\www\shop
npm ERR! command failed
npm ERR! command C:\Windows\system32\cmd.exe /d /s /c "npm run development"

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\VAHIID_PC\AppData\Local\npm-cache\_logs\2021-01-27T17_14_38_176Z-debug.log

C:\wamp\www\shop>

فایل webpack.mix.js

const mix = require('laravel-mix');

/*
 |--------------------------------------------------------------------------
 | Mix Asset Management
 |--------------------------------------------------------------------------
 |
 | Mix provides a clean, fluent API for defining some Webpack build steps
 | for your Laravel applications. By default, we are compiling the CSS
 | file for the application as well as bundling up all the JS files.
 |
 */

mix.js('resources/js/app.js', 'public/js')
    .postCss('resources/css/app.css', 'public/css', [
        //
    ]);

app.css من

@import "style.scss";

@import "~bootstrap/scss/bootstrap.scss";

@import '~@fortawesome/fontawesome-free/scss/fontawesome';
@import '~@fortawesome/fontawesome-free/scss/all.min';
@import '~@fortawesome/fontawesome-free/scss/solid';
@import '~@fortawesome/fontawesome-free/scss/brands';

@import "~flickitycss/flickity.css";

فایل app.js

require('./bootstrap');

require('~@fortawesome/fontawesome-free/js/all.min.js')
require('~@fortawesome/fontawesome-free/js/fontawesome.js')
require('~@fortawesome/fontawesome-free/js/brands.js')
require('~@fortawesome/fontawesome-free/js/solid.js')

require('~flickity/js/flickity.js');

لطفا راهنمایی کنید