babelify

babelify.js

var blacklist = [
    'es6.arrowFunctions',                    // supported
    'es6.blockScoping',                      // supported
    'es6.constants',                         // supported
    'es6.forOf',                             // supported
    //'es6.modules',                           // supported
    'regenerator'
];

try {
    eval('a = (x) => { x + 1}');
} catch (e) {
    console.warn('node running without --harmony flag');
    blacklist = [
        'es6.constants'
    ];
}

require('babel/register')({
    blacklist: blacklist
});