add workflow

src/Config.php

@@ -7,9 +7,6 @@
 
 class Config implements ArrayAccess, \JsonSerializable
 {
-    /**
-     * @var array
-     */
     protected array $config;
 
     /**
@@ -20,20 +17,10 @@ public function __construct(array $config)
         $this->config = $config;
     }
 
-    /**
-     * @param string $key
-     * @param mixed  $default
-     *
-     * @return mixed
-     */
-    public function get(string $key, $default = null)
+    public function get(string $key, mixed $default = null): mixed
     {
         $config = $this->config;
 
-        if (is_null($key)) {
-            return $config;
-        }
-
         if (isset($config[$key])) {
             return $config[$key];
         }
@@ -48,18 +35,8 @@ public function get(string $key, $default = null)
         return $config;
     }
 
-    /**
-     * @param string $key
-     * @param mixed  $value
-     *
-     * @return array
-     */
-    public function set(string $key, $value)
+    public function set(string $key, $value): mixed
     {
-        if (is_null($key)) {
-            throw new InvalidArgumentException('Invalid config key.');
-        }
-
         $keys = explode('.', $key);
         $config = &$this->config;
 
@@ -76,11 +53,6 @@ public function set(string $key, $value)
         return $config;
     }
 
-    /**
-     * @param string $key
-     *
-     * @return bool
-     */
     public function has(string $key): bool
     {
         return (bool) $this->get($key);
@@ -106,7 +78,7 @@ public function offsetUnset(mixed $offset): void
         $this->set($offset, null);
     }
 
-    public function jsonSerialize(): mixed
+    public function jsonSerialize(): array
     {
         return $this->config;
     }