UniqueConstraintsResolver.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\DataSavior;

use Magento\Framework\Setup\Declaration\Schema\Dto\Constraints\Internal;
use Magento\Framework\Setup\Declaration\Schema\Dto\Table;

class UniqueConstraintsResolver
{
    public function resolve(Table $table)
    {
        $primaryKey = $table->getPrimaryConstraint();
        if ($primaryKey) {
            return $primaryKey->getColumnNames();
        }

        $constraints = $table->getConstraints();

        foreach ($constraints as $constraint) {
            if ($constraint instanceof Internal) {
                return $constraint->getColumnNames();
            }
        }

        return false;
    }
}