diff --git a/phpstan.neon b/phpstan.neon
index d2abe66078b..405b71ab3aa 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -21,28 +21,12 @@ parameters:
 
         # baseline, should only shrink
         -
-            message: '#^Method .+ has parameter .+ with no value type specified in iterable type array\.$#'
+            message: '#^.+no value type specified in iterable type.+\.$#'
             path: *
-            count: 363
-        -
-            message: '#^Method .+ has parameter .+ with no value type specified in iterable type iterable\.$#'
-            path: *
-            count: 4
-        -
-            message: '#^Method .+ return type has no value type specified in iterable type array\.$#'
-            path: *
-            count: 153
-        -
-            message: '#^Method .+ return type has no value type specified in iterable type iterable\.$#'
-            path: *
-            count: 15
+            count: 561
         -
             message: '#^Property .+ has no type specified\.$#'
             path: *
             count: 7
-        -
-            message: '#^Property .+ type has no value type specified in iterable type array\.$#'
-            path: *
-            count: 37
     tipsOfTheDay: false
     tmpDir: dev-tools/phpstan/cache
diff --git a/src/Console/Report/FixReport/JsonReporter.php b/src/Console/Report/FixReport/JsonReporter.php
index 6bb05120c0e..4e170e4bce0 100644
--- a/src/Console/Report/FixReport/JsonReporter.php
+++ b/src/Console/Report/FixReport/JsonReporter.php
@@ -45,7 +45,7 @@ public function generate(ReportSummary $reportSummary): string
                 $jsonFile['appliedFixers'] = $fixResult['appliedFixers'];
             }
 
-            if (!empty($fixResult['diff'])) {
+            if ('' !== $fixResult['diff']) {
                 $jsonFile['diff'] = $fixResult['diff'];
             }
 
diff --git a/src/Console/Report/FixReport/JunitReporter.php b/src/Console/Report/FixReport/JunitReporter.php
index 1614f37ca94..9cf9c6df8ce 100644
--- a/src/Console/Report/FixReport/JunitReporter.php
+++ b/src/Console/Report/FixReport/JunitReporter.php
@@ -102,6 +102,9 @@ private function createFailedTestCases(\DOMDocument $dom, \DOMElement $testsuite
         $testsuite->setAttribute('errors', '0');
     }
 
+    /**
+     * @param array{appliedFixers: list<string>, diff: string} $fixResult
+     */
     private function createFailedTestCase(\DOMDocument $dom, string $file, array $fixResult, bool $shouldAddAppliedFixers): \DOMElement
     {
         $appliedFixersCount = \count($fixResult['appliedFixers']);
@@ -127,7 +130,7 @@ private function createFailedTestCase(\DOMDocument $dom, string $file, array $fi
             $failureContent = "Wrong code style\n";
         }
 
-        if (!empty($fixResult['diff'])) {
+        if ('' !== $fixResult['diff']) {
             $failureContent .= "\nDiff:\n---------------\n\n".$fixResult['diff'];
         }
 
diff --git a/src/Console/Report/FixReport/ReportSummary.php b/src/Console/Report/FixReport/ReportSummary.php
index 3c48a0628e2..851d4cb3c26 100644
--- a/src/Console/Report/FixReport/ReportSummary.php
+++ b/src/Console/Report/FixReport/ReportSummary.php
@@ -21,6 +21,9 @@
  */
 final class ReportSummary
 {
+    /**
+     * @var array<string, array{appliedFixers: list<string>, diff: string}>
+     */
     private array $changed;
 
     private int $time;
@@ -34,8 +37,9 @@ final class ReportSummary
     private bool $isDecoratedOutput;
 
     /**
-     * @param int $time   duration in milliseconds
-     * @param int $memory memory usage in bytes
+     * @param array<string, array{appliedFixers: list<string>, diff: string}> $changed
+     * @param int                                                             $time    duration in milliseconds
+     * @param int                                                             $memory  memory usage in bytes
      */
     public function __construct(
         array $changed,
@@ -63,6 +67,9 @@ public function isDryRun(): bool
         return $this->isDryRun;
     }
 
+    /**
+     * @return array<string, array{appliedFixers: list<string>, diff: string}>
+     */
     public function getChanged(): array
     {
         return $this->changed;
diff --git a/src/Console/Report/FixReport/ReporterFactory.php b/src/Console/Report/FixReport/ReporterFactory.php
index 5ffcb5ad04b..d091f441c34 100644
--- a/src/Console/Report/FixReport/ReporterFactory.php
+++ b/src/Console/Report/FixReport/ReporterFactory.php
@@ -15,7 +15,6 @@
 namespace PhpCsFixer\Console\Report\FixReport;
 
 use Symfony\Component\Finder\Finder as SymfonyFinder;
-use Symfony\Component\Finder\SplFileInfo;
 
 /**
  * @author Boris Gorbylev <ekho@ekho.name>
@@ -25,19 +24,18 @@
 final class ReporterFactory
 {
     /**
-     * @var ReporterInterface[]
+     * @var array<string, ReporterInterface>
      */
     private array $reporters = [];
 
     public function registerBuiltInReporters(): self
     {
-        /** @var null|string[] $builtInReporters */
+        /** @var null|list<string> $builtInReporters */
         static $builtInReporters;
 
         if (null === $builtInReporters) {
             $builtInReporters = [];
 
-            /** @var SplFileInfo $file */
             foreach (SymfonyFinder::create()->files()->name('*Reporter.php')->in(__DIR__) as $file) {
                 $relativeNamespace = $file->getRelativePath();
                 $builtInReporters[] = sprintf(
@@ -73,7 +71,7 @@ public function registerReporter(ReporterInterface $reporter): self
     }
 
     /**
-     * @return string[]
+     * @return list<string>
      */
     public function getFormats(): array
     {
diff --git a/src/Console/Report/FixReport/TextReporter.php b/src/Console/Report/FixReport/TextReporter.php
index 19525bc9312..35b479a9c54 100644
--- a/src/Console/Report/FixReport/TextReporter.php
+++ b/src/Console/Report/FixReport/TextReporter.php
@@ -44,27 +44,33 @@ public function generate(ReportSummary $reportSummary): string
             $output .= sprintf('%4d) %s', $i, $file);
 
             if ($reportSummary->shouldAddAppliedFixers()) {
-                $output .= $this->getAppliedFixers($reportSummary->isDecoratedOutput(), $fixResult);
+                $output .= $this->getAppliedFixers(
+                    $reportSummary->isDecoratedOutput(),
+                    $fixResult['appliedFixers'],
+                );
             }
 
-            $output .= $this->getDiff($reportSummary->isDecoratedOutput(), $fixResult);
+            $output .= $this->getDiff($reportSummary->isDecoratedOutput(), $fixResult['diff']);
             $output .= PHP_EOL;
         }
 
         return $output.$this->getFooter($reportSummary->getTime(), $reportSummary->getMemory(), $reportSummary->isDryRun());
     }
 
-    private function getAppliedFixers(bool $isDecoratedOutput, array $fixResult): string
+    /**
+     * @param list<string> $appliedFixers
+     */
+    private function getAppliedFixers(bool $isDecoratedOutput, array $appliedFixers): string
     {
         return sprintf(
             $isDecoratedOutput ? ' (<comment>%s</comment>)' : ' (%s)',
-            implode(', ', $fixResult['appliedFixers'])
+            implode(', ', $appliedFixers)
         );
     }
 
-    private function getDiff(bool $isDecoratedOutput, array $fixResult): string
+    private function getDiff(bool $isDecoratedOutput, string $diff): string
     {
-        if (empty($fixResult['diff'])) {
+        if ('' === $diff) {
             return '';
         }
 
@@ -74,7 +80,7 @@ private function getDiff(bool $isDecoratedOutput, array $fixResult): string
             PHP_EOL
         ));
 
-        return PHP_EOL.$diffFormatter->format($fixResult['diff']).PHP_EOL;
+        return PHP_EOL.$diffFormatter->format($diff).PHP_EOL;
     }
 
     private function getFooter(int $time, int $memory, bool $isDryRun): string
diff --git a/src/Console/Report/FixReport/XmlReporter.php b/src/Console/Report/FixReport/XmlReporter.php
index 16edd379003..d487a189b96 100644
--- a/src/Console/Report/FixReport/XmlReporter.php
+++ b/src/Console/Report/FixReport/XmlReporter.php
@@ -56,11 +56,13 @@ public function generate(ReportSummary $reportSummary): string
             $filesXML->appendChild($fileXML);
 
             if ($reportSummary->shouldAddAppliedFixers()) {
-                $fileXML->appendChild($this->createAppliedFixersElement($dom, $fixResult));
+                $fileXML->appendChild(
+                    $this->createAppliedFixersElement($dom, $fixResult['appliedFixers']),
+                );
             }
 
-            if (!empty($fixResult['diff'])) {
-                $fileXML->appendChild($this->createDiffElement($dom, $fixResult));
+            if ('' !== $fixResult['diff']) {
+                $fileXML->appendChild($this->createDiffElement($dom, $fixResult['diff']));
             }
         }
 
@@ -77,11 +79,14 @@ public function generate(ReportSummary $reportSummary): string
         return $reportSummary->isDecoratedOutput() ? OutputFormatter::escape($dom->saveXML()) : $dom->saveXML();
     }
 
-    private function createAppliedFixersElement(\DOMDocument $dom, array $fixResult): \DOMElement
+    /**
+     * @param list<string> $appliedFixers
+     */
+    private function createAppliedFixersElement(\DOMDocument $dom, array $appliedFixers): \DOMElement
     {
         $appliedFixersXML = $dom->createElement('applied_fixers');
 
-        foreach ($fixResult['appliedFixers'] as $appliedFixer) {
+        foreach ($appliedFixers as $appliedFixer) {
             $appliedFixerXML = $dom->createElement('applied_fixer');
             $appliedFixerXML->setAttribute('name', $appliedFixer);
             $appliedFixersXML->appendChild($appliedFixerXML);
@@ -90,10 +95,10 @@ private function createAppliedFixersElement(\DOMDocument $dom, array $fixResult)
         return $appliedFixersXML;
     }
 
-    private function createDiffElement(\DOMDocument $dom, array $fixResult): \DOMElement
+    private function createDiffElement(\DOMDocument $dom, string $diff): \DOMElement
     {
         $diffXML = $dom->createElement('diff');
-        $diffXML->appendChild($dom->createCDATASection($fixResult['diff']));
+        $diffXML->appendChild($dom->createCDATASection($diff));
 
         return $diffXML;
     }
diff --git a/src/Console/Report/ListSetsReport/ReportSummary.php b/src/Console/Report/ListSetsReport/ReportSummary.php
index 6ca98d9a41e..c7d66e71515 100644
--- a/src/Console/Report/ListSetsReport/ReportSummary.php
+++ b/src/Console/Report/ListSetsReport/ReportSummary.php
@@ -24,12 +24,12 @@
 final class ReportSummary
 {
     /**
-     * @var RuleSetDescriptionInterface[]
+     * @var list<RuleSetDescriptionInterface>
      */
     private array $sets;
 
     /**
-     * @param RuleSetDescriptionInterface[] $sets
+     * @param list<RuleSetDescriptionInterface> $sets
      */
     public function __construct(array $sets)
     {
@@ -37,7 +37,7 @@ public function __construct(array $sets)
     }
 
     /**
-     * @return RuleSetDescriptionInterface[]
+     * @return list<RuleSetDescriptionInterface>
      */
     public function getSets(): array
     {
diff --git a/src/Console/Report/ListSetsReport/ReporterFactory.php b/src/Console/Report/ListSetsReport/ReporterFactory.php
index abf211e9544..cbbb7f4e8d5 100644
--- a/src/Console/Report/ListSetsReport/ReporterFactory.php
+++ b/src/Console/Report/ListSetsReport/ReporterFactory.php
@@ -15,7 +15,6 @@
 namespace PhpCsFixer\Console\Report\ListSetsReport;
 
 use Symfony\Component\Finder\Finder as SymfonyFinder;
-use Symfony\Component\Finder\SplFileInfo;
 
 /**
  * @author Boris Gorbylev <ekho@ekho.name>
@@ -25,19 +24,18 @@
 final class ReporterFactory
 {
     /**
-     * @var ReporterInterface[]
+     * @var array<string, ReporterInterface>
      */
     private array $reporters = [];
 
     public function registerBuiltInReporters(): self
     {
-        /** @var null|string[] $builtInReporters */
+        /** @var null|list<string> $builtInReporters */
         static $builtInReporters;
 
         if (null === $builtInReporters) {
             $builtInReporters = [];
 
-            /** @var SplFileInfo $file */
             foreach (SymfonyFinder::create()->files()->name('*Reporter.php')->in(__DIR__) as $file) {
                 $relativeNamespace = $file->getRelativePath();
                 $builtInReporters[] = sprintf(
@@ -70,7 +68,7 @@ public function registerReporter(ReporterInterface $reporter): self
     }
 
     /**
-     * @return string[]
+     * @return list<string>
      */
     public function getFormats(): array
     {
diff --git a/src/Runner/FileCachingLintingIterator.php b/src/Runner/FileCachingLintingIterator.php
index 261ed56913a..c07dbbd27e3 100644
--- a/src/Runner/FileCachingLintingIterator.php
+++ b/src/Runner/FileCachingLintingIterator.php
@@ -21,6 +21,8 @@
  * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
  *
  * @internal
+ *
+ * @extends \CachingIterator<mixed, \SplFileInfo, \Iterator<mixed, \SplFileInfo>>
  */
 final class FileCachingLintingIterator extends \CachingIterator
 {
@@ -36,6 +38,9 @@ final class FileCachingLintingIterator extends \CachingIterator
      */
     private $nextResult;
 
+    /**
+     * @param \Iterator<mixed, \SplFileInfo> $iterator
+     */
     public function __construct(\Iterator $iterator, LinterInterface $linter)
     {
         parent::__construct($iterator);
diff --git a/src/Runner/FileFilterIterator.php b/src/Runner/FileFilterIterator.php
index cf61029b324..c0f736fda5d 100644
--- a/src/Runner/FileFilterIterator.php
+++ b/src/Runner/FileFilterIterator.php
@@ -24,6 +24,8 @@
  * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
  *
  * @internal
+ *
+ * @extends \FilterIterator<mixed, \SplFileInfo, \Iterator<mixed, \SplFileInfo>>
  */
 final class FileFilterIterator extends \FilterIterator
 {
@@ -32,7 +34,7 @@ final class FileFilterIterator extends \FilterIterator
     private CacheManagerInterface $cacheManager;
 
     /**
-     * @var array<string,bool>
+     * @var array<string, bool>
      */
     private array $visitedElements = [];
 
diff --git a/src/Runner/FileLintingIterator.php b/src/Runner/FileLintingIterator.php
index 9c959372c32..09f5913e30b 100644
--- a/src/Runner/FileLintingIterator.php
+++ b/src/Runner/FileLintingIterator.php
@@ -33,6 +33,9 @@ final class FileLintingIterator extends \IteratorIterator
 
     private LinterInterface $linter;
 
+    /**
+     * @param \Iterator<mixed, \SplFileInfo> $iterator
+     */
     public function __construct(\Iterator $iterator, LinterInterface $linter)
     {
         parent::__construct($iterator);
diff --git a/src/Runner/Runner.php b/src/Runner/Runner.php
index 472c864e88d..f25dc0ddb6c 100644
--- a/src/Runner/Runner.php
+++ b/src/Runner/Runner.php
@@ -57,7 +57,7 @@ final class Runner
     private $finder;
 
     /**
-     * @var FixerInterface[]
+     * @var list<FixerInterface>
      */
     private array $fixers;
 
@@ -65,6 +65,7 @@ final class Runner
 
     /**
      * @param \Traversable<\SplFileInfo> $finder
+     * @param list<FixerInterface>       $fixers
      */
     public function __construct(
         $finder,
@@ -90,6 +91,9 @@ public function __construct(
         $this->stopOnViolation = $stopOnViolation;
     }
 
+    /**
+     * @return array<string, array{appliedFixers: list<string>, diff: string}>
+     */
     public function fix(): array
     {
         $changed = [];
@@ -106,7 +110,6 @@ public function fix(): array
             ? new FileCachingLintingIterator($fileFilteredFileIterator, $this->linter)
             : new FileLintingIterator($fileFilteredFileIterator, $this->linter);
 
-        /** @var \SplFileInfo $file */
         foreach ($collection as $file) {
             $fixInfo = $this->fixFile($file, $collection->currentLintingResult());
 
@@ -126,6 +129,9 @@ public function fix(): array
         return $changed;
     }
 
+    /**
+     * @return null|array{appliedFixers: list<string>, diff: string}
+     */
     private function fixFile(\SplFileInfo $file, LintingResultInterface $lintingResult): ?array
     {
         $name = $file->getPathname();
diff --git a/tests/Console/Report/FixReport/AbstractReporterTestCase.php b/tests/Console/Report/FixReport/AbstractReporterTestCase.php
index 898aee2b617..57371cd38e5 100644
--- a/tests/Console/Report/FixReport/AbstractReporterTestCase.php
+++ b/tests/Console/Report/FixReport/AbstractReporterTestCase.php
@@ -82,6 +82,7 @@ final public function provideGenerateCases(): array
                     [
                         'someFile.php' => [
                             'appliedFixers' => ['some_fixer_name_here'],
+                            'diff' => '',
                         ],
                     ],
                     0,
@@ -113,6 +114,7 @@ final public function provideGenerateCases(): array
                     [
                         'someFile.php' => [
                             'appliedFixers' => ['some_fixer_name_here_1', 'some_fixer_name_here_2'],
+                            'diff' => '',
                         ],
                     ],
                     0,
@@ -128,6 +130,7 @@ final public function provideGenerateCases(): array
                     [
                         'someFile.php' => [
                             'appliedFixers' => ['some_fixer_name_here'],
+                            'diff' => '',
                         ],
                     ],
                     1234,
diff --git a/tests/Console/Report/FixReport/ReportSummaryTest.php b/tests/Console/Report/FixReport/ReportSummaryTest.php
index 4280e09c0ce..f72ccccdcc2 100644
--- a/tests/Console/Report/FixReport/ReportSummaryTest.php
+++ b/tests/Console/Report/FixReport/ReportSummaryTest.php
@@ -26,7 +26,12 @@ final class ReportSummaryTest extends TestCase
 {
     public function testReportSummary(): void
     {
-        $changed = ['', 5];
+        $changed = [
+            'someFile.php' => [
+                'appliedFixers' => ['some_fixer_name_here'],
+                'diff' => 'this text is a diff ;)',
+            ],
+        ];
         $time = time();
         $memory = 123456789;
         $addAppliedFixers = true;