Tiles a png to an A4 landscape size – `node tilepng -p my/png/location/png-to-tile.png` (definitely works in Node 4.8.0)

tilepng.js

#!/usr/bin/env node
'use strict';
//  > npm i -g commander; npm i -g canvas;
// this also requires Cairo: https://www.npmjs.com/package/canvas
//  > brew install pkg-config cairo libpng jpeg giflib

const path = require('path');
const fs = require('fs');

const cmdr = require('commander');

const {createCanvas, Image} = require('canvas');

  cmdr
    .option('-p, --path <n>', 'Path to the png to tile', (p)=>{return path.resolve(p)||undefined;})
    .option('-s, --scale <n>', 'Value to scale source image by', (s)=>{return Number(s)||1;},1)
    .parse(process.argv);

    console.log('Manipulating : '+cmdr.path);
    console.log('Scaling : '+cmdr.scale);

if(!cmdr.path){console.log('No --path given');process.exit();}

fs.readFile(cmdr.path, (err, src) => {
  if (err) throw err;

  var img = new Image;
  img.src = src;

  var c={w:3508,h:2480}
  var canvas = createCanvas(c.w,c.h);
  var ctx = canvas.getContext('2d');

  const iW = img.width*cmdr.scale
  const iH = img.height*cmdr.scale

  for(let w=1;w<(c.w+iW);w+=iW){for(let h=1;h<(c.h+iH);h+=iH){
    ctx.drawImage(img, w, h, iW, iH);
  }}

  fs.writeFile(cmdr.path.replace(/(\.png|\.jpg)$/,".tiled.png"), canvas.toDataURL().replace(/^data:image\/png;base64,/, ""), 'base64', err => {
    if(err)console.log(err);
    else console.log('Complete! '+cmdr.path.replace(/(\.png|\.jpg)$/,".tiled.png"));
  });
});