[!!!][TASK] Add native typing for DebugUtility

Adds type declarations to DebugUtility.

Fixes some calls to these methods to avoid spurious nulls.

Improves documentation in renderDump() to explain why certain
parameters are nullable.

Resolves: #97208
Related: #97210
Related: #97372
Releases: main
Change-Id: Iecad6ef3e7432cf1f4123a4cdb1da15f14d04394
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73991

Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>

typo3/sysext/core/Classes/Utility/DebugUtility.php

 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the TYPO3 CMS project.
  *
@@ -25,26 +27,16 @@ use TYPO3\CMS\Extbase\Utility\DebuggerUtility;
  */
 class DebugUtility
 {
-    /**
-     * @var bool
-     */
-    protected static $plainTextOutput = true;
+    protected static bool $plainTextOutput = true;
 
-    /**
-     * @var bool
-     */
-    protected static $ansiColorUsage = true;
+    protected static bool $ansiColorUsage = true;
 
     /**
      * Debug
      *
      * Directly echos out debug information as HTML (or plain in CLI context)
-     *
-     * @param string $var
-     * @param string $header
-     * @param string $group
      */
-    public static function debug($var = '', $header = 'Debug', $group = 'Debug')
+    public static function debug(mixed $var = '', string $header = 'Debug', string $group = 'Debug'): void
     {
         // buffer the output of debug if no buffering started before
         if (ob_get_level() === 0) {
@@ -83,9 +75,9 @@ class DebugUtility
      * Converts a variable to a string
      *
      * @param mixed $variable
-     * @return string plain, not HTML encoded string
+     * @return string Plain, not HTML encoded string
      */
-    public static function convertVariableToString($variable)
+    public static function convertVariableToString(mixed $variable): string
     {
         $string = self::renderDump($variable, '', true, false);
         return $string === '' ? '| debug |' : $string;
@@ -93,12 +85,8 @@ class DebugUtility
 
     /**
      * Opens a debug message inside a popup window
-     *
-     * @param mixed $debugVariable
-     * @param string $header
-     * @param string $group
      */
-    public static function debugInPopUpWindow($debugVariable, $header = 'Debug', $group = 'Debug')
+    public static function debugInPopUpWindow(mixed $debugVariable, string $header = 'Debug', string $group = 'Debug'): void
     {
         $debugString = self::renderDump($debugVariable, sprintf('%s (%s)', $header, $group));
         $script = '
@@ -142,9 +130,9 @@ class DebugUtility
      * Displays the "path" of the function call stack in a string, using debug_backtrace
      *
      * @param bool $prependFileNames If set to true file names are added to the output
-     * @return string plain, not HTML encoded string
+     * @return string Plain, not HTML encoded string
      */
-    public static function debugTrail($prependFileNames = false)
+    public static function debugTrail(bool $prependFileNames = false): string
     {
         $trail = debug_backtrace(0);
         $trail = array_reverse($trail);
@@ -169,10 +157,10 @@ class DebugUtility
     /**
      * Displays an array as rows in a table. Useful to debug output like an array of database records.
      *
-     * @param mixed $rows Array of arrays with similar keys
+     * @param array $rows Array of arrays with similar keys
      * @param string $header Table header
      */
-    public static function debugRows($rows, $header = '')
+    public static function debugRows(array $rows, string $header = ''): void
     {
         self::debug($rows, $header);
     }
@@ -184,14 +172,14 @@ class DebugUtility
      * @param int $characters Number of characters to show
      * @return string The string with ASCII values in separated by a space char.
      */
-    public static function ordinalValue($string, $characters = 100)
+    public static function ordinalValue(string $string, int $characters = 100): string
     {
         if (strlen($string) < $characters) {
             $characters = strlen($string);
         }
         $valuestring = '';
         for ($i = 0; $i < $characters; $i++) {
-            $valuestring .= ' ' . ord(substr($string, $i, 1));
+            $valuestring .= ' ' . ord($string[$i]);
         }
         return trim($valuestring);
     }
@@ -204,7 +192,7 @@ class DebugUtility
      * @param mixed $array_in Array to view
      * @return string HTML output
      */
-    public static function viewArray($array_in)
+    public static function viewArray(mixed $array_in): string
     {
         return self::renderDump($array_in);
     }
@@ -215,7 +203,7 @@ class DebugUtility
      * @param mixed $array_in Array to print visually (in a table).
      * @see viewArray()
      */
-    public static function printArray($array_in)
+    public static function printArray(mixed $array_in): void
     {
         echo self::renderDump($array_in);
     }
@@ -225,11 +213,11 @@ class DebugUtility
      *
      * @param mixed $variable
      * @param string $title
-     * @param bool|null $plainText
-     * @param bool|null $ansiColors
+     * @param bool|null $plainText Omit or pass null to use the current default.
+     * @param bool|null $ansiColors Omit or pass null to use the current default.
      * @return string
      */
-    protected static function renderDump($variable, $title = '', $plainText = null, $ansiColors = null)
+    protected static function renderDump(mixed $variable, string $title = '', ?bool $plainText = null, ?bool $ansiColors = null): string
     {
         $plainText = $plainText ?? Environment::isCli() && self::$plainTextOutput;
         $ansiColors = $ansiColors ?? Environment::isCli() && self::$ansiColorUsage;
@@ -244,9 +232,8 @@ class DebugUtility
      * This method is usually only used in tests to preset the output behaviour
      *
      * @internal
-     * @param bool $plainTextOutput
      */
-    public static function usePlainTextOutput($plainTextOutput)
+    public static function usePlainTextOutput(bool $plainTextOutput): void
     {
         static::$plainTextOutput = $plainTextOutput;
     }
@@ -259,9 +246,8 @@ class DebugUtility
      * This method is usually only used in tests to preset the ansi color usage
      *
      * @internal
-     * @param bool $ansiColorUsage
      */
-    public static function useAnsiColor($ansiColorUsage)
+    public static function useAnsiColor(bool $ansiColorUsage): void
     {
         static::$ansiColorUsage = $ansiColorUsage;
     }

typo3/sysext/core/Documentation/Changelog/12.0/Breaking-97210-TypesAddedToMethodSignaturesOrClassProperties.rst

@@ -16,6 +16,7 @@ expectations and existing behavior.
 - :php:`\TYPO3\CMS\Core\Utility\ArrayUtility`
 - :php:`\TYPO3\CMS\Core\Utility\ClassNamingUtility`
 - :php:`\TYPO3\CMS\Core\Utility\CommandUtility`
+- :php:`\TYPO3\CMS\Core\Utility\DebugUtility`
 - :php:`\TYPO3\CMS\Core\Utility\DiffUtility`
 - :php:`\TYPO3\CMS\Core\Utility\MathUtility`
 - :php:`\TYPO3\CMS\Core\Utility\PathUtility`

typo3/sysext/core/Resources/PHP/GlobalDebugFunctions.php

 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the TYPO3 CMS project.
  *
@@ -16,7 +18,7 @@
 // Short-hand debug function
 // If you wish to use the debug()-function, and it does not output something,
 // please edit the IP mask in TYPO3_CONF_VARS
-function debug($variable = '', $title = null, $group = null)
+function debug(mixed $variable = '', ?string $title = null, ?string $group = null): void
 {
     if (!\TYPO3\CMS\Core\Utility\GeneralUtility::cmpIP(
         \TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('REMOTE_ADDR'),
@@ -25,5 +27,5 @@ function debug($variable = '', $title = null, $group = null)
     ) {
         return;
     }
-    \TYPO3\CMS\Core\Utility\DebugUtility::debug($variable, $title, $group);
+    \TYPO3\CMS\Core\Utility\DebugUtility::debug($variable, $title ?? '', $group ?? '');
 }