End of file newline

[codler]

What is the current behavior?
Newline at end of file are added.

If the current behavior is a bug, please provide the steps to reproduce.

1. Have a package.json with no newline at end of file.
2. Run for example yarn add webpack --dev

What is the expected behavior?
Newlines at end of file shouldn't be modified.

Please mention your node.js, yarn and operating system version.
node: 6.9.3
yarn 0.19.1
macOS Sierra 10.12.2

Why this is a bug is because it conflicts with for example when I do an auto format in Visual Studio Code.

[gsklee]

@bestander close

This is perfectly in line with npm's behavior; see facebook/create-react-app#1510, shipshapecode/ember-cli-release#21.