Here you can find the source of pushAll(array)
Array.prototype.pushAll = function (array) { array.forEach(function(x) {this.push(x)}, this); };
Array.prototype.push32le = function(aLongWord) {
this.push((aLongWord ) & 0xff,
(aLongWord >> 8) & 0xff,
(aLongWord >> 16) & 0xff,
(aLongWord >> 24) & 0xff);
};
Array.prototype.push8 = function (aByte) {
this.push(aByte & 0xFF);
};
Array.prototype.push8 = function (num) {
this.push(num & 0xFF);
};
Array.prototype.push8 = function(val) { this.push(0xFF & val); return this; };
Array.prototype.pushAll = function() { for (var a = 0; a < arguments.length; a++) { arr = arguments[a]; for (var i = 0; i < arr.length; i++) { this.push(arr[i]);
Array.prototype.pushAll = function (items) { if (! Array.isArray (items)) { throw new TypeError("Argument must be an array"); return this.push(...items); };
Array.prototype.pushAll = function(items) { if (!Array.isArray(items)) { throw new TypeError("Argument must be an array."); return this.push(...items); };
Array.prototype.pushAll = function (items) { if (!Array.isArray(items)) { throw new TypeError("Argument must be an array."); return this.push(...items); };
Array.prototype.pushAll = function (iterable) { for (const value of iterable) { this.push(value)