[0.12.0] .scripts([input], output) in production environment outputs 'undefined'

• Laravel Mix Version: 0.12.0
• Node Version: 7.5.0
• NPM Version: 4.1.2
• OS: OS X El Capitan 10.11.6

Description:

Attempting to minify vanilla JS, without webpack. Running in dev environment works as expected, but production environment outputs ‘undefined’ for all javascript output files.

Steps To Reproduce:

Using the following files:

package.json

{
  "private": true,
  "scripts": {
    "dev": "npm run development",
    "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": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "watch-poll": "npm run watch -- --watch-poll",
    "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
    "prod": "npm run production",
    "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
  },
  "devDependencies": {
    "axios": "^0.15.3",
    "bootstrap-sass": "^3.3.7",
    "cross-env": "^3.2.3",
    "jquery": "^2.2.3",
    "laravel-mix": "0.*",
    "lodash": "^4.17.4",
    "vue": "^1.0.26"
  }
}

webpack.mix.js

mix.options({
    processCssUrls: false,
});
mix.sass('resources/assets/sass/app.scss', 'public/css');
mix.scripts(['resources/assets/js/app.js'], 'public/js/app.js');
mix.scripts(['resources/assets/js/enquiry.js'], 'public/js/enquiry.js');
mix.scripts(['resources/assets/js/login.js'], 'public/js/login.js');
mix.scripts(['resources/assets/js/register.js'], 'public/js/register.js');
mix.scripts(['resources/assets/js/search.js'], 'public/js/search.js');
mix.scripts([
   'node_modules/jquery/dist/jquery.js',
   'node_modules/bootstrap-sass/assets/javascripts/bootstrap/collapse.js',
   'node_modules/bootstrap-sass/assets/javascripts/bootstrap/dropdown.js',
   'node_modules/bootstrap-sass/assets/javascripts/bootstrap/tab.js',
   'node_modules/bootstrap-sass/assets/javascripts/bootstrap/transition.js',
], 'public/js/vendor.js');
mix.copyDirectory('resources/assets/fonts', 'public/fonts');
mix.copyDirectory('resources/assets/img', 'public/img');

npm run dev: Outputs all files as expected. Sass, vanilla js (concatenated, unminified), etc. npm run prod: All js output files contain ‘undefined’.

I’ve downgraded to Laravel Mix 0.11.4, which has fixed my issues.

[ankurk91]

Should be fixed by v0.12.1

[dhawton]

I found the issue while using .babel, same solution resolved the issue.

Verified setting laravel-mix to 0.11.4 in package.json has it properly uglifying/outputting.