This extension support multi mix configration without overwriting the mix-manifest.json file.
First, install the extension.
npm install laravel-mix-merge-manifest --save-dev
Then, require it within your webpack.mix.js
file, like so:
let mix = require('laravel-mix');
require('laravel-mix-merge-manifest');
mix
.js('resources/assets/js/app.js', 'public/js')
.less('resources/assets/less/app.less', 'public/css')
.mergeManifest();