PhpCsFixer\Fixer\Import\SingleImportPerStatementFixer::detectIndent PHP Method

    private function detectIndent(Tokens $tokens, $index)
    {
        if (!$tokens[$index - 1]->isWhitespace()) {
            return '';
            // cannot detect indent
        }
        $explodedContent = explode("\n", $tokens[$index - 1]->getContent());
        return end($explodedContent);
    }