'use strict';

const compressor=require('node-minify');

const start=Date.now();

compressor.minify({
    compressor: 'gcc',
    input: 'server.js',
    output: 'server-min.js',
    sync: false,
    callback: function(err, min) {
        console.log('callback at '+(Date.now()-start)+'ms');
        if(err)
            console.log(err);
    }
});
console.log('next instruction at '+(Date.now()-start)+'ms');

next instruction at 60390ms
callback at 60408ms

next instruction at 18ms
callback at 60408ms