path-is-absolute 
Node.js 0.12
path.isAbsolute()ponyfill
Install
$ npm install --save path-is-absolute
Usage
const pathIsAbsolute = require('path-is-absolute');
// Running on Linux
pathIsAbsolute('/home/foo');
//=> true
pathIsAbsolute('C:/Users/foo');
//=> false
// Running on Windows
pathIsAbsolute('C:/Users/foo');
//=> true
pathIsAbsolute('/home/foo');
//=> false
// Running on any OS
pathIsAbsolute.posix('/home/foo');
//=> true
pathIsAbsolute.posix('C:/Users/foo');
//=> false
pathIsAbsolute.win32('C:/Users/foo');
//=> true
pathIsAbsolute.win32('/home/foo');
//=> false
API
See the path.isAbsolute() docs.
pathIsAbsolute(path)
pathIsAbsolute.posix(path)
POSIX specific version.
pathIsAbsolute.win32(path)
Windows specific version.
License
MIT © Sindre Sorhus