Merge pull request #748 from Adyen/support-explicit-nullable

Add nullable return types to API mustache templates

Author: ayodejidev

src/Adyen/Config.php

@@ -34,7 +34,7 @@ class Config
      *
      * @param array|null $params
      */
-    public function __construct(array $params = null)
+    public function __construct(?array $params = null)
     {
         if ($params) {
             foreach ($params as $key => $param) {

templates/api_parameters.mustache

@@ -1,2 +1,2 @@
 {{! Path and body are required, followed by optional query string and request options }}
-{{#pathParams}}{{{dataType}}} ${{baseName}}, {{/pathParams}}{{#bodyParams}}{{{dataType}}} ${{#lambda.camelcase}}{{paramName}}{{/lambda.camelcase}}, {{/bodyParams}}array $requestOptions = null
+{{#pathParams}}{{{dataType}}} ${{baseName}}, {{/pathParams}}{{#bodyParams}}{{{dataType}}} ${{#lambda.camelcase}}{{paramName}}{{/lambda.camelcase}}, {{/bodyParams}}?array $requestOptions = null

templates/model_generic.mustache

@@ -239,7 +239,7 @@ class {{classname}} {{#parentSchema}}extends {{{parent}}}{{/parentSchema}}{{^par
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         {{#parentSchema}}
         parent::__construct($data);