code: function validateCodeBlock (codeBlock, file) {
    var lang = codeBlock.lang;
    var code = codeBlock.code;
  
    if (lang === 'json') {
      try {
        JSON.parse(code);
      } catch (e) {
        console.log(e);
        console.log(code);
        return false;
      }
      return true;
    } else if (lang === 'js' || lang === 'javascript') {
      code = preprocessCode(code);
      try {
        esprima.parse(code, { tolerant: true });
      } catch (e) {
  
        // Get indeces from lineNumber and column
        var line   = e.lineNumber - 1;
        var column = e.column - 1;
  
        // Highlight error in code
        code = code.split('\n');
  
        code[line] = code[line].slice(0, column).magenta +
                     code[line][column].red +
                     code[line].slice(column + 1).magenta;
  
        code = code.join('\n');
  
        if (!didLogFileBreak) {
          logFileBreak(file);
          didLogFileBreak = true;
        }
  
        console.log(e);
        console.log(code);
  
        return false;
      }
      return true;
    }
  }
docs: Validates that code blocks are valid JavaScript
  @param  {Object} code A block of code from the markdown file containg the lang and code
  @param  {String} file Name of file currently being validated