could not find declaration file for modules 'laravel-mix' in laravel

I want to use laravel mix and installed node modules but when i import laravel mix by- const mix = require('laravel-mix'); it says could not find declaration file for modules 'laravel-mix' any suggestion please.

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

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

mix.copyDirectory('resources/backend', 'public/backend');
mix.js('resources/js/app.js', 'public/backend/js');

via Chebli Mohamed