Fix type errors

composer.json

@@ -16,7 +16,7 @@
     "require": {
         "php": "^7.2 || ^8.0",
         "symfony/finder": "^4.4 || ^5.3 || ^6 || ^7",
-        "composer/pcre": "^2 || ^3"
+        "composer/pcre": "^2.1 || ^3.1"
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^5",

src/ClassMapGenerator.php

@@ -174,7 +174,7 @@ public function scanPaths($path, string $excluded = null, string $autoloadType =
             }
 
             $classes = PhpFileParser::findClasses($filePath);
-            if ('classmap' !== $autoloadType && isset($namespace, $basePath)) {
+            if ('classmap' !== $autoloadType && isset($namespace)) {
                 $classes = $this->filterByNamespace($classes, $filePath, $namespace, $autoloadType, $basePath);
 
                 // if no valid class was found in the file then we do not mark it as scanned as it might still be matched by another rule later
@@ -291,7 +291,7 @@ private static function normalizePath(string $path)
         }
 
         // extract a prefix being a protocol://, protocol:, protocol://drive: or simply drive:
-        if (Preg::isMatch('{^( [0-9a-z]{2,}+: (?: // (?: [a-z]: )? )? | [a-z]: )}ix', $path, $match)) {
+        if (Preg::isMatchStrictGroups('{^( [0-9a-z]{2,}+: (?: // (?: [a-z]: )? )? | [a-z]: )}ix', $path, $match)) {
             $prefix = $match[1];
             $path = substr($path, \strlen($prefix));
         }
@@ -313,7 +313,7 @@ private static function normalizePath(string $path)
         }
 
         // ensure c: is normalized to C:
-        $prefix = Preg::replaceCallback('{(^|://)[a-z]:$}i', function (array $m) { return strtoupper($m[0]); }, $prefix);
+        $prefix = Preg::replaceCallbackStrictGroups('{(?:^|://)[a-z]:$}i', function (array $m) { return strtoupper($m[0]); }, $prefix);
 
         return $prefix.$absolute.implode('/', $parts);
     }

src/PhpFileParser.php

@@ -52,8 +52,8 @@ public static function findClasses(string $path): array
         }
 
         // return early if there is no chance of matching anything in this file
-        Preg::matchAll('{\b(?:class|interface|trait'.$extraTypes.')\s}i', $contents, $matches);
-        if (!$matches) {
+        Preg::matchAllStrictGroups('{\b(?:class|interface|trait'.$extraTypes.')\s}i', $contents, $matches);
+        if (0 === \count($matches)) {
             return array();
         }
 
@@ -76,14 +76,15 @@ public static function findClasses(string $path): array
                 $namespace = str_replace(array(' ', "\t", "\r", "\n"), '', (string) $matches['nsname'][$i]) . '\\';
             } else {
                 $name = $matches['name'][$i];
+                assert(is_string($name));
                 // skip anon classes extending/implementing
                 if ($name === 'extends' || $name === 'implements') {
                     continue;
                 }
                 if ($name[0] === ':') {
                     // This is an XHP class, https://github.com/facebook/xhp
                     $name = 'xhp'.substr(str_replace(array('-', ':'), array('_', '__'), $name), 1);
-                } elseif (strtolower($matches['type'][$i]) === 'enum') {
+                } elseif (strtolower((string) $matches['type'][$i]) === 'enum') {
                     // something like:
                     //   enum Foo: int { HERP = '123'; }
                     // The regex above captures the colon, which isn't part of