Add psalm purity markers

Author: colinodell

src/Data.php

@@ -141,6 +141,8 @@ public function remove(string $key): void
 
     /**
      * {@inheritdoc}
+     *
+     * @psalm-mutation-free
      */
     public function get(string $key, $default = null)
     {
@@ -163,6 +165,8 @@ public function get(string $key, $default = null)
 
     /**
      * {@inheritdoc}
+     *
+     * @psalm-mutation-free
      */
     public function has(string $key): bool
     {
@@ -185,6 +189,8 @@ public function has(string $key): bool
 
     /**
      * {@inheritdoc}
+     *
+     * @psalm-mutation-free
      */
     public function getData(string $key): DataInterface
     {
@@ -214,6 +220,8 @@ public function importData(DataInterface $data, bool $clobber = true): void
 
     /**
      * {@inheritdoc}
+     *
+     * @psalm-mutation-free
      */
     public function export(): array
     {

src/DataInterface.php

@@ -43,6 +43,8 @@ public function remove(string $key): void;
      * @param mixed $default
      *
      * @return mixed
+     *
+     * @psalm-mutation-free
      */
     public function get(string $key, $default = null);
 
@@ -52,6 +54,8 @@ public function get(string $key, $default = null);
      * @param string $key
      *
      * @return bool
+     *
+     * @psalm-mutation-free
      */
     public function has(string $key): bool;
 
@@ -61,6 +65,8 @@ public function has(string $key): bool;
      * @param string $key
      *
      * @return DataInterface
+     *
+     * @psalm-mutation-free
      */
     public function getData(string $key): DataInterface;
 
@@ -84,6 +90,8 @@ public function importData(DataInterface $data, bool $clobber = true): void;
      * Export data as raw data
      *
      * @return array<string, mixed>
+     *
+     * @psalm-mutation-free
      */
     public function export(): array;
 }

src/Util.php

@@ -22,6 +22,8 @@ class Util
      * @param array<mixed> $arr
      *
      * @return bool
+     *
+     * @psalm-pure
      */
     public static function isAssoc(array $arr): bool
     {
@@ -36,6 +38,8 @@ public static function isAssoc(array $arr): bool
      * @param bool  $clobber
      *
      * @return mixed
+     *
+     * @psalm-pure
      */
     public static function mergeAssocArray($to, $from, $clobber = true)
     {