DeclareStrictTypesRule.php

<?php

namespace Worksome\CodingStyle\PHPStan;

use PhpParser\Node;
use PHPStan\Analyser\Scope;
use PHPStan\Node\FileNode;
use PHPStan\Rules\Rule;
use PHPStan\Rules\RuleErrorBuilder;

/**
 * @implements Rule<FileNode>
 */
class DeclareStrictTypesRule implements Rule
{
    public function getNodeType(): string
    {
        return FileNode::class;
    }

    /**
     * @param FileNode $node
     */
    public function processNode(Node $node, Scope $scope): array
    {
        $nodes = $node->getNodes();

        if (count($nodes) === 0) {
            return [];
        }

        $firstNode = array_shift($nodes);

        if ($firstNode instanceof Node\Stmt\Declare_) {
            foreach ($firstNode->declares as $declare) {
                if (
                    'strict_types' === $declare->key->toLowerString()
                    && $declare->value instanceof Node\Scalar\LNumber
                    && 1 === $declare->value->value
                ) {
                    return [];
                }
            }
        }

        return [
            RuleErrorBuilder::message('PHP files should declare strict types.')
                ->identifier('worksome.declareStrictTypes')
                ->build(),
        ];
    }
}