Changed return type of escapeHtml method to a conditional, so phpstan knows it'll be a string or an array depending on the type of the input.

Author: hostep

app/code/Magento/Sales/Block/Adminhtml/Order/Comments/View.php

@@ -111,7 +111,7 @@ public function canSendCommentEmail()
      *
      * @param string|int|float|\Stringable|array<string|int|float|\Stringable> $data
      * @param null|array $allowedTags
-     * @return string
+     * @return ($data is array ? string[] : string)
      */
     public function escapeHtml($data, $allowedTags = null)
     {

app/code/Magento/Sales/Block/Adminhtml/Order/View/History.php

@@ -134,7 +134,7 @@ public function isCustomerNotificationNotApplicable(\Magento\Sales\Model\Order\S
      *
      * @param string|int|float|\Stringable|array<string|int|float|\Stringable> $data
      * @param null|array $allowedTags
-     * @return string
+     * @return ($data is array ? string[] : string)
      */
     public function escapeHtml($data, $allowedTags = null)
     {

app/code/Magento/Sales/Helper/Admin.php

@@ -156,7 +156,7 @@ public function applySalableProductTypesFilter($collection)
      *
      * @param string|int|float|\Stringable|array<string|int|float|\Stringable> $data
      * @param null|array $allowedTags
-     * @return string
+     * @return ($data is array ? string[] : string)
      */
     public function escapeHtmlWithLinks($data, $allowedTags = null)
     {

lib/internal/Magento/Framework/Escaper.php

@@ -72,7 +72,7 @@ class Escaper
      *
      * @param string|int|float|\Stringable|array<string|int|float|\Stringable> $data
      * @param array|null $allowedTags
-     * @return string|array
+     * @return ($data is array ? string[] : string)
      */
     public function escapeHtml($data, $allowedTags = null)
     {

lib/internal/Magento/Framework/View/Element/AbstractBlock.php

@@ -894,7 +894,7 @@ public static function extractModuleName($className)
      *
      * @param string|int|float|\Stringable|array<string|int|float|\Stringable> $data
      * @param array|null $allowedTags
-     * @return string
+     * @return ($data is array ? string[] : string)
      * @deprecated 103.0.0 Use $escaper directly in templates and in blocks.
      * @see Escaper Usage
      */