Declare types

Author: sebastianbergmann

src/Differ.php

@@ -182,7 +182,7 @@ private function detectUnmatchedLineEndings(array $diff): bool
         return false;
     }
 
-    private function getLinebreak($line): string
+    private function getLinebreak(int|string $line): string
     {
         if (!is_string($line)) {
             return '';

src/Output/StrictUnifiedDiffOutputBuilder.php

@@ -127,8 +127,10 @@ public function getDiff(array $diff): string
             : $diff;
     }
 
-    private function writeDiffHunks($output, array $diff): void
+    private function writeDiffHunks(mixed $output, array $diff): void
     {
+        assert(is_resource($output));
+
         // detect "No newline at end of file" and insert into `$diff` if needed
 
         $upperLimit = count($diff);
@@ -278,8 +280,10 @@ private function writeHunk(
         int $fromRange,
         int $toStart,
         int $toRange,
-        $output
+        mixed $output
     ): void {
+        assert(is_resource($output));
+
         fwrite($output, '@@ -' . $fromStart);
 
         if (!$this->collapseRanges || 1 !== $fromRange) {

src/Output/UnifiedDiffOutputBuilder.php

@@ -75,8 +75,10 @@ public function getDiff(array $diff): string
             : $diff;
     }
 
-    private function writeDiffHunks($output, array $diff): void
+    private function writeDiffHunks(mixed $output, array $diff): void
     {
+        assert(is_resource($output));
+
         // detect "No newline at end of file" and insert into `$diff` if needed
 
         $upperLimit = count($diff);
@@ -224,8 +226,10 @@ private function writeHunk(
         int $fromRange,
         int $toStart,
         int $toRange,
-        $output
+        mixed $output
     ): void {
+        assert(is_resource($output));
+
         if ($this->addLineNumbers) {
             fwrite($output, '@@ -' . $fromStart);