Ensure all properties have a type

Author: nicolas-grekas

Dumper/AbstractDumper.php

@@ -26,10 +26,13 @@ abstract class AbstractDumper implements DataDumperInterface, DumperInterface
     public const DUMP_COMMA_SEPARATOR = 4;
     public const DUMP_TRAILING_COMMA = 8;
 
+    /** @var callable|resource|string|null */
     public static $defaultOutput = 'php://output';
 
     protected $line = '';
+    /** @var callable|null */
     protected $lineDumper;
+    /** @var resource|null */
     protected $outputStream;
     protected $decimalPoint = '.';
     protected $indentPad = '  ';
@@ -55,9 +58,9 @@ public function __construct($output = null, string $charset = null, int $flags =
     /**
      * Sets the output destination of the dumps.
      *
-     * @param callable|resource|string $output A line dumper callable, an opened stream or an output path
+     * @param callable|resource|string|null $output A line dumper callable, an opened stream or an output path
      *
-     * @return callable|resource|string The previous output destination
+     * @return callable|resource|string|null The previous output destination
      */
     public function setOutput($output)
     {

Dumper/CliDumper.php

@@ -22,6 +22,7 @@
 class CliDumper extends AbstractDumper
 {
     public static $defaultColors;
+    /** @var callable|resource|string|null */
     public static $defaultOutput = 'php://stdout';
 
     protected $colors;
@@ -534,7 +535,7 @@ protected function supportsColors(): bool
         if ($this->outputStream !== static::$defaultOutput) {
             return $this->hasColorSupport($this->outputStream);
         }
-        if (null !== static::$defaultColors) {
+        if (isset(static::$defaultColors)) {
             return static::$defaultColors;
         }
         if (isset($_SERVER['argv'][1])) {

Dumper/HtmlDumper.php

@@ -21,6 +21,7 @@
  */
 class HtmlDumper extends CliDumper
 {
+    /** @var callable|resource|string|null */
     public static $defaultOutput = 'php://output';
 
     protected static $themes = [