npm run broken since 0.8.0

Hi there,

and thanks for you amazing work.

• Laravel Mix Version: 0.8.0
• Node Version (node -v): v7.4.0
• NPM Version (npm -v): 4.3.0
• OS: Mac Sierra

Description:

Since upgrading to 0.8.0 (was working with 0.7) I can not run npm run hot anymore

> @ hot /Users/rd/Web/code
> node_modules/cross-env/bin/cross-env.js NODE_ENV=development webpack-dev-server --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js

module.js:472
    throw err;
    ^

Error: Cannot find module 'autoprefixer'
    at Function.Module._resolveFilename (module.js:470:15)
    at Function.Module._load (module.js:418:25)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/Users/rd/Web/code/node_modules/laravel-mix/setup/webpack.config.js:101:21)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at requireConfig (/Users/rd/Web/code/node_modules/webpack/bin/convert-argv.js:96:18)
    at /Users/rd/Web/code/node_modules/webpack/bin/convert-argv.js:109:17
    at Array.forEach (native)
    at module.exports (/Users/rd/Web/code/node_modules/webpack/bin/convert-argv.js:107:15)

npm ERR! Darwin 16.5.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "hot"
npm ERR! node v7.4.0
npm ERR! npm  v4.3.0
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ hot: `node_modules/cross-env/bin/cross-env.js NODE_ENV=development webpack-dev-server --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the @ hot script 'node_modules/cross-env/bin/cross-env.js NODE_ENV=development webpack-dev-server --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the  package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node_modules/cross-env/bin/cross-env.js NODE_ENV=development webpack-dev-server --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs 
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls 
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/rd/.npm/_logs/2017-02-15T19_38_27_428Z-debug.log

[kohenkatz]

Running npm install autoprefixer fixes it, but it really shouldn’t be broken out of the box.

[maiolica]

Can confirm npm run dev is broken since 0.8.0.