index.js

///////////////////////////////////////////////////////////
// wait-sync                                             //
///////////////////////////////////////////////////////////
// a simple synchronous-yet-non-blocking "wait()" module
//
// 1. while you "wait()", async operations from the same
//    execution block still work in the background (so
//    non-blocking)
//
// 2. at the same time, the execution block will pseudo-run
//    in a serial, linear manner
///////////////////////////////////////////////////////////

var deasync = require('deasync');

module.exports = (seconds=1) => {

    if (typeof seconds !== 'number') {
        throw new Error('waitSync :: invalid <seconds> argument' + seconds);
    }

    var isDone   = false;
    var start    = new Date().getTime();
    var msToWait = seconds * 1000;

    var interval = setInterval(() => {
        var now   = new Date().getTime();
        var delta = now - start;

        if (delta >= msToWait){
            clearInterval(interval);
            isDone = true;
        }
    }, 25);

    deasync.loopWhile(() => !isDone);
    return;
};