Where to run laravel front build?

Question

npm

Can you help me figure out where to run npm run prod in Laravel, in the local environment or on the server itself? Who does what?

webpack.mix.js

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

//front
mix.js('resources/js/app.js', 'public/js');
mix.sass('resources/sass/front/app.sass', 'public/css');

mix.copyDirectory('resources/fonts', 'public/fonts');
mix.copyDirectory('resources/images', 'public/images');

//dashboard
mix.js('resources/js/dashboard.js', 'public/js');
mix.sass('resources/sass/dashboard/dashboard.sass', 'public/css');


if (mix.inProduction()) {
    mix.version();
    mix.minify('public/js/app.js');
    mix.minify('public/css/app.css');
} else{
    mix.browserSync("http://site.loc/");
}