SVGをPNGに変換するJavaScriptコード

svg2png.js

function svg2png(svgURL){
  const img = new Image();
  return new Promise((resolve)=>{
    img.addEventListener('load',()=>{
      const canvas = document.createElement('canvas');

      canvas.width = img.width;
      canvas.height = img.height;

      const ctx = canvas.getContext('2d');
      ctx.drawImage(img, 0, 0, img.width, img.height);
      fetch(canvas.toDataURL('image/png'))
      .then(res=>res.blob())
      .then(URL.createObjectURL)
      .then(resolve);
    });
    img.src = svgURL;
  });
}