Fix issues found by Psalm

inc/class-inputfactory.php

@@ -70,7 +70,7 @@ private static function get_attributes( array $params ): string {
 	}
 
 	/**
-	 * @psalm-param HelpArgs $args
+	 * @psalm-param HelpArgs&mixed[] $args
 	 */
 	private static function render_help( array $args ): void {
 		if ( ! empty( $args['help'] ) ) {

psalm.xml.dist

@@ -4,6 +4,8 @@
     resolveFromConfigFile="true"
     phpVersion="7.4"
     findUnusedPsalmSuppress="true"
+    findUnusedCode="true"
+    findUnusedBaselineEntry="true"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
@@ -13,7 +15,15 @@
         <directory name="inc"/>
         <directory name="views"/>
     </projectFiles>
+    <issueHandlers>
+        <PossiblyUnusedReturnValue errorLevel="suppress"/>
+        <PossiblyUnusedMethod errorLevel="suppress"/>
+        <RedundantCast errorLevel="suppress"/>
+        <RedundantCastGivenDocblockType errorLevel="suppress"/>
+        <UnusedClass errorLevel="suppress"/>
+    </issueHandlers>
     <stubs>
         <file name="vendor/php-stubs/wordpress-stubs/wordpress-stubs.php"/>
+        <file name="wordpress.stubs"/>
     </stubs>
 </psalm>

wordpress.stubs

@@ -0,0 +1,50 @@
+<?php
+
+namespace {
+	define( 'OBJECT', 'OBJECT' );
+	define( 'object', 'OBJECT' );
+	define( 'OBJECT_K', 'OBJECT_K' );
+	define( 'ARRAY_A', 'ARRAY_A' );
+	define( 'ARRAY_N', 'ARRAY_N' );
+
+	class wpdb {
+
+		/** @var string */
+		public $login_log_table = '';
+
+		/**
+		 * @param string $query
+		 * @param mixed $args
+		 * @return string|null
+		 */
+		public function prepare( $query, ...$args ) {}
+	}
+
+	/**
+	 * @param mixed $data        Optional. Data to encode as JSON, then print and die. Default null.
+	 * @param int   $status_code Optional. The HTTP status code to output. Default null.
+	 * @param int   $options     Optional. Options to be passed to json_encode(). Default 0.
+	 * @psalm-return never-returns
+	 */
+	function wp_send_json_error( $data = null, $status_code = null, $options = 0 ) {}
+
+	/**
+	 * @param mixed $response    Variable (usually an array or object) to encode as JSON,
+	 *                           then print and die.
+	 * @param int   $status_code Optional. The HTTP status code to output. Default null.
+	 * @param int   $options     Optional. Options to be passed to json_encode(). Default 0.
+	 * @psalm-return never-returns
+	 */
+	function wp_send_json( $response, $status_code = null, $options = 0 ) {}
+
+	/**
+	 * @param string   $id
+	 * @param string   $title
+	 * @param callable $callback
+	 * @param string   $page
+	 * @param string   $section
+	 * @psalm-param array{class?: string, label_for?: string, ...} $args
+	 * @return void
+	 */
+	function add_settings_field( $id, $title, $callback, $page, $section = 'default', $args = array() ) {}
+}