Primer commit del sistema separado falta mejorar mucho

vendor/react/promise/src/Deferred.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace React\Promise;
+
+/**
+ * @template T
+ */
+final class Deferred
+{
+    /**
+     * @var PromiseInterface<T>
+     */
+    private $promise;
+
+    /** @var callable(T):void */
+    private $resolveCallback;
+
+    /** @var callable(\Throwable):void */
+    private $rejectCallback;
+
+    /**
+     * @param (callable(callable(T):void,callable(\Throwable):void):void)|null $canceller
+     */
+    public function __construct(?callable $canceller = null)
+    {
+        $this->promise = new Promise(function ($resolve, $reject): void {
+            $this->resolveCallback = $resolve;
+            $this->rejectCallback  = $reject;
+        }, $canceller);
+    }
+
+    /**
+     * @return PromiseInterface<T>
+     */
+    public function promise(): PromiseInterface
+    {
+        return $this->promise;
+    }
+
+    /**
+     * @param T $value
+     */
+    public function resolve($value): void
+    {
+        ($this->resolveCallback)($value);
+    }
+
+    public function reject(\Throwable $reason): void
+    {
+        ($this->rejectCallback)($reason);
+    }
+}