code: function cleanCode(str) {
    str = str
      .replace(/\r\n|[\r\n\u2028\u2029]/g, '\n') // unify linebreaks
      .replace(/^\uFEFF/, ''); // replace zero-width no-break space
  
    str = stripFnStart(str) // replace function declaration
      .replace(/\)\s*\)\s*$/, ')') // replace closing paren
      .replace(/\s*};?\s*$/, ''); // replace closing bracket
  
    // Preserve indentation by finding leading tabs/spaces
    // and removing that amount of space from each line
    const spaces = str.match(/^\n?( *)/)[1].length;
    const tabs = str.match(/^\n?(\t*)/)[1].length;
    /* istanbul ignore next */
    const indentRegex = new RegExp(`^\n?${tabs ? '\t' : ' '}{${tabs || spaces}}`, 'gm');
  
    str = str.replace(indentRegex, '').trim();
    return str;
  }
docs: Strip the function definition from `str`,
  and re-indent for pre whitespace.
  
  @param {String} str - code in
  
  @return {String} cleaned code string