OS independent access to variables in package.json

To make it cross-platform, use cross-var:

"scripts": {
    "preinstall": "cross-var echo ${npm_package_name}"
}

There's no known way to do this that's OS independent.

A good workaround is to execute the command within a node script:

First, change the preinstall command to execute a node script:

"scripts": {
    "preinstall": "node nameEcho.js"
}

Then you define the command in the nameEcho.js file:

// require the package.json file
var pjson = require('./package.json');

// echo the package's name
console.log(pjson.name);

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