Is there a reliable way of detecting whether io.js or node.js is running?
The only way I can kind-of infer whether node.js or io.js is running is to check process.versions.node . In io.js, I get 1.0.4.
I'm sure there's a better way - anyone know?
Now the most reliable solution is to exec node -h and see if it contains iojs.org substring. If it does - it's iojs :
function isIojs(callback) {
require('child_process').exec(process.execPath + ' -h', function(err, help) {
return err ? callback(err) : callback(null, /iojs.org/.test(help));
});
}
The big minus of such approach - it's asynchronous. So I wrote a small library which is simplifying the job: is-iojs.
But frankly speaking: who knows when node version 1 will be released, maybe never. So I think for now determination based only on process.version is enough:
var isIojs = parseInt(process.version.match(/^v(d+)./)[1]) >= 1;
Also you can check process.execPath string, but this approach does not works for windows as far as I know.