Add typed class properties

Author: andrewdalpino

src/Events/DatasetInferred.php

@@ -18,7 +18,7 @@ class DatasetInferred implements Event
      *
      * @var \Rubix\ML\Datasets\Dataset
      */
-    protected $dataset;
+    protected \Rubix\ML\Datasets\Dataset $dataset;
 
     /**
      * @param \Rubix\ML\Datasets\Dataset $dataset

src/Events/Failure.php

@@ -18,7 +18,7 @@ abstract class Failure implements Event
      *
      * @var \Exception
      */
-    protected $exception;
+    protected \Exception $exception;
 
     /**
      * @param \Exception $exception

src/Events/MemoryUsageUpdated.php

@@ -18,7 +18,7 @@ class MemoryUsageUpdated implements Event
      *
      * @var \Rubix\Server\Models\Memory
      */
-    protected $memory;
+    protected \Rubix\Server\Models\Memory $memory;
 
     /**
      * @param \Rubix\Server\Models\Memory $memory

src/Events/RequestReceived.php

@@ -18,7 +18,7 @@ class RequestReceived implements Event
      *
      * @var \Psr\Http\Message\ServerRequestInterface
      */
-    protected $request;
+    protected \Psr\Http\Message\ServerRequestInterface $request;
 
     /**
      * @param \Psr\Http\Message\ServerRequestInterface $request

src/Events/ResponseSent.php

@@ -18,7 +18,7 @@ class ResponseSent implements Event
      *
      * @var \Psr\Http\Message\ResponseInterface
      */
-    protected $response;
+    protected \Psr\Http\Message\ResponseInterface $response;
 
     /**
      * @param \Psr\Http\Message\ResponseInterface $response

src/GraphQL/Enums/DataTypeEnum.php

@@ -11,7 +11,7 @@ class DataTypeEnum extends EnumType
      *
      * @var self|null
      */
-    protected static $instance;
+    protected static ?self $instance = null;
 
     /**
      * @return self

src/GraphQL/Enums/EstimatorTypeEnum.php

@@ -11,7 +11,7 @@ class EstimatorTypeEnum extends EnumType
      *
      * @var self|null
      */
-    protected static $instance;
+    protected static ?self $instance = null;
 
     /**
      * @return self

src/GraphQL/InputObjects/DatasetInputObject.php

@@ -12,7 +12,7 @@ class DatasetInputObject extends InputObjectType
      *
      * @var self|null
      */
-    protected static $instance;
+    protected static ?self $instance = null;
 
     /**
      * @return self

src/GraphQL/Objects/EstimatorInterfacesObject.php

@@ -12,7 +12,7 @@ class EstimatorInterfacesObject extends ObjectType
      *
      * @var self|null
      */
-    protected static $instance;
+    protected static ?self $instance = null;
 
     /**
      * @return self

src/GraphQL/Objects/HTTPStatsObject.php

@@ -12,7 +12,7 @@ class HTTPStatsObject extends ObjectType
      *
      * @var self|null
      */
-    protected static $instance;
+    protected static ?self $instance = null;
 
     /**
      * @return self