Add interface RpcMessageInterface to allow for type hinting of a JSON-RPC object (request,notification,response) in usage of the library

Author: lucasnetau

src/Notification.php

@@ -2,26 +2,24 @@
 
 namespace EdgeTelemetrics\JSON_RPC;
 
-use JsonSerializable;
-
 /**
  * Class Notification
  * @package EdgeTelemetrics\JSON_RPC
  */
-class Notification implements JsonSerializable {
+class Notification implements RpcMessageInterface {
 
     /** @var string JSONRPC Version String */
     const JSONRPC_VERSION = '2.0';
 
     /**
      * @var string A String containing the name of the method to be invoked
      */
-    protected $method = '';
+    protected string $method = '';
 
     /**
      * @var array A Structured value that holds the parameter values to be used during the invocation of the method
      */
-    protected $params = [];
+    protected array $params = [];
 
     /**
      * Notification constructor.

src/Request.php

@@ -2,7 +2,6 @@
 
 namespace EdgeTelemetrics\JSON_RPC;
 
-use JsonSerializable;
 use RuntimeException;
 
 use function is_float;
@@ -16,7 +15,7 @@
  *
  * Request extends Notification and includes the Id property
  */
-class Request extends Notification implements JsonSerializable {
+class Request extends Notification implements RpcMessageInterface {
 
     /**
      * @var string|int|null An identifier established by the Client that MUST contain a String, Number, or NULL value

src/Response.php

@@ -2,7 +2,6 @@
 
 namespace EdgeTelemetrics\JSON_RPC;
 
-use JsonSerializable;
 use RuntimeException;
 
 use function is_float;
@@ -14,7 +13,7 @@
  * Class Response
  * @package EdgeTelemetrics\JSON_RPC
  */
-class Response implements JsonSerializable {
+class Response implements RpcMessageInterface {
     /**
      * @var string|int|null
      */

src/RpcMessageInterface.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+
+namespace EdgeTelemetrics\JSON_RPC;
+
+use JsonSerializable;
+
+/**
+ * Interface for typehinting in functions that we want a JsonRpc object (request,notification,response)
+ */
+interface RpcMessageInterface extends JsonSerializable {}