vrrv-installer-builder/nsis-auto-updater/nm/concat-map/index.js

A complete solution to package and build a ready for distribution Electron app for MacOS, Windows and Linux with “auto update” support out of the box

module.exports = function (xs, fn) {
    var res = [];
    for (var i = 0; i < xs.length; i++) {
        var x = fn(xs[i], i);
        if (isArray(x)) res.push.apply(res, x);
        else res.push(x);
    }
    return res;
};

var isArray = Array.isArray || function (xs) {
    return Object.prototype.toString.call(xs) === '[object Array]';
};