function mark(text) {
            if (color && _chalk2.default.red) {
                return _chalk2.default.red.bold(text);
            } else {
                return text;
            }
        }
Returns a few lines of CSS source that caused the error.

If the CSS has an input source map without `sourceContent`,
this method will return an empty string.

@param {boolean} [color] whether arrow will be colored red by terminal
                         color codes. By default, PostCSS will detect
                         color support by `process.stdout.isTTY`
                         and `process.env.NODE_DISABLE_COLORS`.

@example
error.showSourceCode() //=> "  4 | }
                       //      5 | a {
                       //    > 6 |   bad
                       //        |   ^
                       //      7 | }
                       //      8 | b {"

@return {string} few lines of CSS source that caused the error