get image aspect ratio

aspect.js

function getRandomInt(min, max) {
  let sign = Math.random() < 0.5 ? -1 : 1;
  min = Math.ceil(min);
  max = Math.floor(max);
  return (Math.floor(Math.random() * (max - min + 1)) + min) * sign;
}

function getNewHeight(oldWidth, oldHeight, newWidth) {
  const aspectRatio = (oldWidth / oldHeight);
  const newHeight = (newWidth / aspectRatio);
  return Math.floor(newHeight);
}

const images_with_dimensions = [];
images.forEach((item) => {
  const { width: oldWidth, height: oldHeight } = Image.resolveAssetSource(item);
  const newWidth = base_width - getRandomInt(5, 30);
  const newHeight = getNewHeight(oldWidth, oldHeight, newWidth);
  images_with_dimensions.push({
    source: item,
    width: newWidth,
    height: newHeight,
    org_width: oldWidth,
    org_height: oldHeight
  });
});