don't re-install `react-scripts` when installed globally

[jordyvandomselaar]

Installing react-scripts can take up to 30 mins on my laptop. Maybe allow create-react-app to use global react-scripts if it's there? I've installed it globally and thought it'd save quite some time, but it tries to download it again anyway when running create-react-app

[gaearon]

up to 30 mins

That's quite a lot. What version of npm are you using?
With Yarn next installs would be faster too, and #898 will add support for it.

[jordyvandomselaar]

My npm version is 3.10.9, 30 mins is indeed quite long, and I'm sure windows's cmd isn't the fastest to begin with hahaha

[jordyvandomselaar]

Here's a full log on what command prompt tells me

Creating a new React app in c:\xampp\htdocs\irc.

Installing packages. This might take a couple minutes.
Installing react-scripts from npm...

npm install --save-dev --save-exact react-scripts failed

c:\xampp\htdocs>```

[gaearon]

We'll release an update using Yarn soon so you might want to give that a try once it's out.

[gaearon]

Yarn integration is out in the latest version of Create React App so you can use it, and it should be much better.