Fragment for `.eleventy.js` for a slightly modified svg shortcode

eleventy.js

const fs = require('fs');

module.exports = config => {

  /*
    Custom svg shortcode to more cleanly include svgs.
    Based on https://dev.to/extrabright/11ty-inject-svg-code-using-shortcodes-3l4m but extended to support additional attributes.
    Takes file path, and optionally any additional attributes to be output as part of the <svg> opening tag
    
    Basic example:
    {% svg "/path/to/file.svg" %}
    
    Examples with attributes:
    {% svg "/path/to/file.svg",'role="img" aria-label="TetraLogical"' %}
    {% svg "/path/to/file.svg",'class="icon" aria-hidden="true"' %}
    
    */
  config.addShortcode("svg", function (file, attributes) {
    let relativeFilePath = `./src/${file}`;
    let data = fs.readFileSync(relativeFilePath, 
      function(err, contents) {
        if (err) return err
        return contents
      }
    );
    data = data.toString('utf8');
    if (attributes) {
      data = data.replace('<svg', '<svg '+attributes);
    }
    return data;
  });

  /* all your other config stuff */

};