svgo-browser/plugins/removeViewBox.js

svgo tool for browser and node usage

exports.type = 'perItem';

exports.active = true;

exports.description = 'removes viewBox attribute when possible';

const viewBoxElems = ['svg', 'pattern', 'symbol'];

/**
 * Remove viewBox attr which coincides with a width/height box.
 *
 * @see http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute
 *
 * @example
 * <svg width="100" height="50" viewBox="0 0 100 50">
 *             ⬇
 * <svg width="100" height="50">
 *
 * @param {Object} item current iteration item
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich
 */
exports.fn = function (item) {
  if (
    item.isElem(viewBoxElems)
    && item.hasAttr('viewBox')
    && item.hasAttr('width')
    && item.hasAttr('height')
  ) {
    const nums = item.attr('viewBox').value.split(/[ ,]+/g);

    if (
      nums[0] === '0'
      && nums[1] === '0'
      && item.attr('width').value.replace(/px$/, '') === nums[2] // could use parseFloat too
      && item.attr('height').value.replace(/px$/, '') === nums[3]
    ) {
      item.removeAttr('viewBox');
    }
  }
};