code: function isIgnored(ignore, tag, type, format) {
    // Clean svg+xml ==> svg
    const formatAlt = format && format.indexOf('+') ? format.split('+')[0] : null;
  
    if (!Array.isArray(ignore)) {
      ignore = [ignore];
    }
  
    return !!(
      ignore.includes(tag) ||
      ignore.includes(type) ||
      ignore.includes(format) ||
      ignore.includes(formatAlt)
    );
  }
docs: Retrieve ignored state for 'tag' or 'type' or 'format'
  @param {String | Array} ignore
  @param {String} tag
  @param {String} type
  @param {String} format
  @returns {Boolean}