Add custom Psalm stub to get tap helper generics

monorepo/stubs/helpers.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * @template T
+ *
+ * @param  T  $value
+ * @param  callable(?T): mixed  $callback
+ * @return T
+ */
+function tap($value, $callback = null)
+{
+}
+
+class HigherOrderTapProxy
+{
+    /**
+     * @template T
+     *
+     * @param  T  $target
+     */
+    public function __construct($target)
+    {
+    }
+
+    /**
+     * @template T
+     *
+     * @param  T  $target
+     * @param  string  $method
+     * @param  array  $parameters
+     * @return T
+     */
+    public function __call($method, $parameters)
+    {
+    }
+}

psalm.xml

@@ -25,6 +25,7 @@
         <pluginClass class="Psalm\LaravelPlugin\Plugin"/>
     </plugins>
     <stubs>
+        <file name="monorepo/stubs/helpers.php" />
         <file name="monorepo/stubs/Application.php" />
     </stubs>
 </psalm>