Fix psalm warning

Author: SpacePossum

.psalm/baseline.xml

@@ -2,7 +2,6 @@
 <psalm
     totallyTyped="false"
     cacheDirectory=".psalm/cache"
-    errorBaseline=".psalm/baseline.xml"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"

.psalm/config.xml

@@ -70,17 +70,10 @@ public function __construct(array $options = [])
             throw new ConfigurationException('commonLineThreshold', 'an int > 0', $options['commonLineThreshold']);
         }
 
-        foreach (['fromFile', 'toFile'] as $option) {
-            if (!\is_string($options[$option])) {
-                throw new ConfigurationException($option, 'a string', $options[$option]);
-            }
-        }
-
-        foreach (['fromFileDate', 'toFileDate'] as $option) {
-            if (null !== $options[$option] && !\is_string($options[$option])) {
-                throw new ConfigurationException($option, 'a string or <null>', $options[$option]);
-            }
-        }
+        $this->assertString($options, 'fromFile');
+        $this->assertString($options, 'toFile');
+        $this->assertStringOrNull($options, 'fromFileDate');
+        $this->assertStringOrNull($options, 'toFileDate');
 
         $this->header = \sprintf(
             "--- %s%s\n+++ %s%s\n",
@@ -166,7 +159,9 @@ private function writeDiffHunks($output, array $diff): void
         $hunkCapture = false;
         $sameCount   = $toRange = $fromRange = 0;
         $toStart     = $fromStart = 1;
+        $i           = 0;
 
+        /** @var int $i */
         foreach ($diff as $i => $entry) {
             if (0 === $entry[1]) { // same
                 if (false === $hunkCapture) {
@@ -312,4 +307,18 @@ private function writeHunk(
             //}
         }
     }
+
+    private function assertString(array $options, string $option): void
+    {
+        if (!is_string($options[$option])) {
+            throw new ConfigurationException($option, 'a string', $options[$option]);
+        }
+    }
+
+    private function assertStringOrNull(array $options, string $option): void
+    {
+        if (null !== $options[$option] && !\is_string($options[$option])) {
+            throw new ConfigurationException($option, 'a string or <null>', $options[$option]);
+        }
+    }
 }

src/Output/StrictUnifiedDiffOutputBuilder.php

@@ -115,7 +115,9 @@ private function writeDiffHunks($output, array $diff): void
         $hunkCapture = false;
         $sameCount   = $toRange   = $fromRange = 0;
         $toStart     = $fromStart = 1;
+        $i           = 0;
 
+        /** @var int $i */
         foreach ($diff as $i => $entry) {
             if (0 === $entry[1]) { // same
                 if (false === $hunkCapture) {

src/Output/UnifiedDiffOutputBuilder.php

@@ -65,6 +65,7 @@ private function parseFileDiff(Diff $diff, array $lines): void
     {
         $chunks = [];
         $chunk  = null;
+        $diffLines = [];
 
         foreach ($lines as $line) {
             if (\preg_match('/^@@\s+-(?P<start>\d+)(?:,\s*(?P<startrange>\d+))?\s+\+(?P<end>\d+)(?:,\s*(?P<endrange>\d+))?\s+@@/', $line, $match)) {