QuotesSniff.php

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<?php
namespace Magento\Sniffs\Less;

use PHP_CodeSniffer\Sniffs\Sniff;
use PHP_CodeSniffer\Files\File;

class QuotesSniff implements Sniff
{
    public $supportedTokenizers = [TokenizerSymbolsInterface::TOKENIZER_CSS];

    public function register()
    {
        return [T_CONSTANT_ENCAPSED_STRING];
    }

    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();

        if (false !== strpos($tokens[$stackPtr]['content'], '"')) {
            $phpcsFile->addError('Use single quotes', $stackPtr, 'DoubleQuotes');
        }
    }
}