From 0f2d0961c43135684423e2321c6bb640557e7bab Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Tue, 26 Jan 2021 22:03:39 +0100
Subject: [PATCH] docs: Update typing information.

---
 src/Operation/Last.php     | 4 ++++
 src/Operation/Unfold.php   | 5 ++++-
 src/Operation/Unwindow.php | 5 ++++-
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/Operation/Last.php b/src/Operation/Last.php
index 16cc3c1cf..fca0e552e 100644
--- a/src/Operation/Last.php
+++ b/src/Operation/Last.php
@@ -37,6 +37,10 @@ static function (Iterator $iterator): Iterator {
                     return new EmptyIterator();
                 }
 
+                /**
+                 * @psalm-var TKey $key
+                 * @psalm-var T $current
+                 */
                 return yield $key => $current;
             };
     }
diff --git a/src/Operation/Unfold.php b/src/Operation/Unfold.php
index f5720d8c1..f76a4350c 100644
--- a/src/Operation/Unfold.php
+++ b/src/Operation/Unfold.php
@@ -40,7 +40,10 @@ public function __invoke(): Closure
                      */
                     static function () use ($parameters, $callback): Generator {
                         while (true) {
-                            yield $parameters = $callback(...array_values((array) $parameters));
+                            /** @psalm-var T $parameters */
+                            $parameters = $callback(...array_values((array) $parameters));
+
+                            yield $parameters;
                         }
                     };
     }
diff --git a/src/Operation/Unwindow.php b/src/Operation/Unwindow.php
index 5df2c2026..fafffb98c 100644
--- a/src/Operation/Unwindow.php
+++ b/src/Operation/Unwindow.php
@@ -25,9 +25,12 @@ public function __invoke(): Closure
             /**
              * @psalm-param iterable<TKey, list<T>> $iterable
              *
-             * @psalm-return T
+             * @psalm-return T|null
              */
             static function (iterable $iterable) {
+                $value = null;
+
+                /** @psalm-var T $value */
                 foreach ($iterable as $value) {
                 }