Stricter PHPStan level to 8 (#671)

Related #669 

PHPStan (static code analysis) allows you to choose the type of warnings
based on levels.
https://phpstan.org/user-guide/rule-levels

It is currently set to level 5 (the maximum is 10). Let's make it
stricter and refactor the code for better quality.

I've raised it to level 8 in this PR for now.

Author: eucyt

docs/classes/LINE-Laravel-LINEBotServiceProvider.html

@@ -178,7 +178,7 @@ <h3 id="toc">
                     <dt class="phpdocumentor-table-of-contents__entry -property -private">
     <a href="classes/LINE-Laravel-LINEBotServiceProvider.html#property_apiBindings">$apiBindings</a>
     <span>
-                        &nbsp;: mixed            </span>
+                        &nbsp;: array&lt;string|int, mixed&gt;            </span>
 </dt>
 <dd></dd>
 
@@ -199,7 +199,7 @@ <h3 id="toc">
             <dt class="phpdocumentor-table-of-contents__entry -method -private">
     <a href="classes/LINE-Laravel-LINEBotServiceProvider.html#method_bindApis">bindApis()</a>
     <span>
-                                &nbsp;: mixed    </span>
+                                &nbsp;: void    </span>
 </dt>
 <dd></dd>
 
@@ -222,7 +222,7 @@ <h4 class="phpdocumentor-element__name" id="constant_CONFIG_PATH">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/laravel/lib/LINEBotServiceProvider.php"><a href="files/src-laravel-lib-linebotserviceprovider.html"><abbr title="src/laravel/lib/LINEBotServiceProvider.php">LINEBotServiceProvider.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">56</span>
+    <span class="phpdocumentor-element-found-in__line">59</span>
 
     </aside>
 
@@ -266,20 +266,20 @@ <h4 class="phpdocumentor-element__name" id="property_apiBindings">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/laravel/lib/LINEBotServiceProvider.php"><a href="files/src-laravel-lib-linebotserviceprovider.html"><abbr title="src/laravel/lib/LINEBotServiceProvider.php">LINEBotServiceProvider.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">25</span>
+    <span class="phpdocumentor-element-found-in__line">28</span>
 
     </aside>
 
 
     <code class="phpdocumentor-code phpdocumentor-signature ">
     <span class="phpdocumentor-signature__visibility">private</span>
-    <span class="phpdocumentor-signature__static">static</span>    <span class="phpdocumentor-signature__type">mixed</span>
+    <span class="phpdocumentor-signature__static">static</span>    <span class="phpdocumentor-signature__type">array&lt;string|int, mixed&gt;</span>
     <span class="phpdocumentor-signature__name">$apiBindings</span>
      = <span class="phpdocumentor-signature__default-value">[&#039;line-bot-channel-access-token-api&#039; =&gt; [&#039;config&#039; =&gt; \LINE\Clients\ChannelAccessToken\Configuration::class, &#039;api&#039; =&gt; \LINE\Clients\ChannelAccessToken\Api\ChannelAccessTokenApi::class], &#039;line-bot-insight-api&#039; =&gt; [&#039;config&#039; =&gt; \LINE\Clients\Insight\Configuration::class, &#039;api&#039; =&gt; \LINE\Clients\Insight\Api\InsightApi::class], &#039;line-bot-liff-api&#039; =&gt; [&#039;config&#039; =&gt; \LINE\Clients\Liff\Configuration::class, &#039;api&#039; =&gt; \LINE\Clients\Liff\Api\LiffApi::class], &#039;line-bot-manage-audience-api&#039; =&gt; [&#039;config&#039; =&gt; \LINE\Clients\ManageAudience\Configuration::class, &#039;api&#039; =&gt; \LINE\Clients\ManageAudience\Api\ManageAudienceApi::class], &#039;line-bot-manage-audience-blob-api&#039; =&gt; [&#039;config&#039; =&gt; \LINE\Clients\ManageAudience\Configuration::class, &#039;api&#039; =&gt; \LINE\Clients\ManageAudience\Api\ManageAudienceBlobApi::class], &#039;line-bot-messaging-api&#039; =&gt; [&#039;config&#039; =&gt; \LINE\Clients\MessagingApi\Configuration::class, &#039;api&#039; =&gt; \LINE\Clients\MessagingApi\Api\MessagingApiApi::class], &#039;line-bot-messaging-blob-api&#039; =&gt; [&#039;config&#039; =&gt; \LINE\Clients\MessagingApi\Configuration::class, &#039;api&#039; =&gt; \LINE\Clients\MessagingApi\Api\MessagingApiBlobApi::class]]</span></code>
 
-        <section class="phpdocumentor-description"></section>
-
-        <section class="phpdocumentor-description"></section>
+    
+        <section class="phpdocumentor-description"><p>array&lt;string, array{config: class-string, api: class-string}&gt;</p>
+</section>
 
 
 
@@ -304,7 +304,7 @@ <h4 class="phpdocumentor-element__name" id="method_boot">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/laravel/lib/LINEBotServiceProvider.php"><a href="files/src-laravel-lib-linebotserviceprovider.html"><abbr title="src/laravel/lib/LINEBotServiceProvider.php">LINEBotServiceProvider.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">63</span>
+    <span class="phpdocumentor-element-found-in__line">66</span>
 
     </aside>
 
@@ -337,7 +337,7 @@ <h4 class="phpdocumentor-element__name" id="method_register">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/laravel/lib/LINEBotServiceProvider.php"><a href="files/src-laravel-lib-linebotserviceprovider.html"><abbr title="src/laravel/lib/LINEBotServiceProvider.php">LINEBotServiceProvider.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">82</span>
+    <span class="phpdocumentor-element-found-in__line">85</span>
 
     </aside>
 
@@ -370,38 +370,38 @@ <h4 class="phpdocumentor-element__name" id="method_bindApis">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/laravel/lib/LINEBotServiceProvider.php"><a href="files/src-laravel-lib-linebotserviceprovider.html"><abbr title="src/laravel/lib/LINEBotServiceProvider.php">LINEBotServiceProvider.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">98</span>
+    <span class="phpdocumentor-element-found-in__line">101</span>
 
     </aside>
 
 
     <code class="phpdocumentor-code phpdocumentor-signature ">
     <span class="phpdocumentor-signature__visibility">private</span>
-                    <span class="phpdocumentor-signature__name">bindApis</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">mixed&nbsp;</span><span class="phpdocumentor-signature__argument__name">$facadeName</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">mixed&nbsp;</span><span class="phpdocumentor-signature__argument__name">$clientClass</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">mixed&nbsp;</span><span class="phpdocumentor-signature__argument__name">$configClass</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">mixed</span></code>
+                    <span class="phpdocumentor-signature__name">bindApis</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$facadeName</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$clientClass</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$configClass</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">void</span></code>
 
         <section class="phpdocumentor-description"></section>
 
         <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
     <dl class="phpdocumentor-argument-list">
                     <dt class="phpdocumentor-argument-list__entry">
                 <span class="phpdocumentor-signature__argument__name">$facadeName</span>
-                : <span class="phpdocumentor-signature__argument__return-type">mixed</span>
+                : <span class="phpdocumentor-signature__argument__return-type">string</span>
                             </dt>
             <dd class="phpdocumentor-argument-list__definition">
                     <section class="phpdocumentor-description"></section>
 
             </dd>
                     <dt class="phpdocumentor-argument-list__entry">
                 <span class="phpdocumentor-signature__argument__name">$clientClass</span>
-                : <span class="phpdocumentor-signature__argument__return-type">mixed</span>
+                : <span class="phpdocumentor-signature__argument__return-type">string</span>
                             </dt>
             <dd class="phpdocumentor-argument-list__definition">
                     <section class="phpdocumentor-description"></section>
 
             </dd>
                     <dt class="phpdocumentor-argument-list__entry">
                 <span class="phpdocumentor-signature__argument__name">$configClass</span>
-                : <span class="phpdocumentor-signature__argument__return-type">mixed</span>
+                : <span class="phpdocumentor-signature__argument__return-type">string</span>
                             </dt>
             <dd class="phpdocumentor-argument-list__definition">
                     <section class="phpdocumentor-description"></section>
@@ -412,7 +412,7 @@ <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
 
 
         <h5 class="phpdocumentor-return-value__heading">Return values</h5>
-    <span class="phpdocumentor-signature__response_type">mixed</span>
+    <span class="phpdocumentor-signature__response_type">void</span>
             &mdash;
 
 

docs/classes/LINE-Laravel-Tests-Facades-FacadesTest.html

@@ -201,14 +201,14 @@ <h3 id="toc">
             <dt class="phpdocumentor-table-of-contents__entry -method -protected">
     <a href="classes/LINE-Laravel-Tests-Facades-FacadesTest.html#method_getPackageAliases">getPackageAliases()</a>
     <span>
-                                &nbsp;: array&lt;string|int, mixed&gt;    </span>
+                                &nbsp;: array&lt;string, class-string&gt;    </span>
 </dt>
 <dd>Load package alias</dd>
 
             <dt class="phpdocumentor-table-of-contents__entry -method -protected">
     <a href="classes/LINE-Laravel-Tests-Facades-FacadesTest.html#method_getPackageProviders">getPackageProviders()</a>
     <span>
-                                &nbsp;: array&lt;string|int, mixed&gt;    </span>
+                                &nbsp;: array&lt;string|int, string&gt;    </span>
 </dt>
 <dd>Load package service provider</dd>
 
@@ -327,7 +327,7 @@ <h4 class="phpdocumentor-element__name" id="method_getPackageAliases">
 
     <code class="phpdocumentor-code phpdocumentor-signature ">
     <span class="phpdocumentor-signature__visibility">protected</span>
-                    <span class="phpdocumentor-signature__name">getPackageAliases</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type"><abbr title="\Illuminate\Foundation\Application">Application</abbr>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$app</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span></code>
+                    <span class="phpdocumentor-signature__name">getPackageAliases</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type"><abbr title="\Illuminate\Foundation\Application">Application</abbr>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$app</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string, class-string&gt;</span></code>
 
 
         <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
@@ -359,7 +359,7 @@ <h5 class="phpdocumentor-tag-list__heading" id="tags">
                         </dl>
 
         <h5 class="phpdocumentor-return-value__heading">Return values</h5>
-    <span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span>
+    <span class="phpdocumentor-signature__response_type">array&lt;string, class-string&gt;</span>
             &mdash;
 
 
@@ -385,7 +385,7 @@ <h4 class="phpdocumentor-element__name" id="method_getPackageProviders">
 
     <code class="phpdocumentor-code phpdocumentor-signature ">
     <span class="phpdocumentor-signature__visibility">protected</span>
-                    <span class="phpdocumentor-signature__name">getPackageProviders</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type"><abbr title="\Illuminate\Foundation\Application">Application</abbr>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$app</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span></code>
+                    <span class="phpdocumentor-signature__name">getPackageProviders</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type"><abbr title="\Illuminate\Foundation\Application">Application</abbr>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$app</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string|int, string&gt;</span></code>
 
 
         <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
@@ -417,7 +417,7 @@ <h5 class="phpdocumentor-tag-list__heading" id="tags">
                         </dl>
 
         <h5 class="phpdocumentor-return-value__heading">Return values</h5>
-    <span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span>
+    <span class="phpdocumentor-signature__response_type">array&lt;string|int, string&gt;</span>
             &mdash;