diff --git a/src/Engine.php b/src/Engine.php
index cbe4222..130c6b5 100644
--- a/src/Engine.php
+++ b/src/Engine.php
@@ -25,7 +25,7 @@ function runBrainGame(string $moduleName): void
     runGame($module);
 }
 
-function loadTexts($module): array
+function loadTexts(array $module): array
 {
     $textsFile = __DIR__ . '/texts.json';
     if (!file_exists($textsFile)) {
@@ -33,11 +33,13 @@ function loadTexts($module): array
     }
 
     try {
-        $texts = json_decode(file_get_contents($textsFile), true, 512, JSON_THROW_ON_ERROR);
+        $content = file_get_contents($textsFile);
+        $texts = $content ? json_decode($content, true, 512, JSON_THROW_ON_ERROR) : '';
     } catch (JsonException $e) {
     }
 
-    if (empty($texts)) {
+    $isEmptyConfig = !isset($texts) || !$texts;
+    if ($isEmptyConfig) {
         throw new RuntimeException("Config $textsFile wasn't loaded");
     }
 
@@ -45,7 +47,7 @@ function loadTexts($module): array
     return $module;
 }
 
-function buildGame($moduleName): array
+function buildGame(string $moduleName): array
 {
     $module = [];
     $moduleFile = __DIR__ . '/Games/' . $moduleName . '.php';
@@ -60,7 +62,7 @@ function buildGame($moduleName): array
 function greetUser(array $module): array
 {
     line(getText($module, 'dialogs.welcome'));
-    $userName = prompt(getText($module, 'prompts.ask_name') . ' ', false, '');
+    $userName = prompt(getText($module, 'prompts.ask_name') . ' ', '', '');
     $module = setUserName($module, $userName);
 
     line(getText($module, 'dialogs.greeting', ['[user_name]' => $userName]));
@@ -74,9 +76,8 @@ function runGame(array $module, int $correctAnswerCounter = 0): void
 
     [$question, $correctAnswer] = getQuestionAnswerPairHandler($module);
     line(getText($module, 'prompts.question', ['[question]' => $question]));
-
     $userAnswer = prompt(getText($module, 'prompts.answer'));
-    $isValidAnswer = (string)$correctAnswer === $userAnswer;
+    $isValidAnswer = $correctAnswer === $userAnswer;
 
     /** Game over */
     if (!$isValidAnswer) {
diff --git a/src/Games/CalcGame.php b/src/Games/CalcGame.php
index 7be91ed..c740bd0 100644
--- a/src/Games/CalcGame.php
+++ b/src/Games/CalcGame.php
@@ -7,7 +7,7 @@
 use const BrainGames\Utils\ModuleUtils\HANDLER_QUESTION;
 use const BrainGames\Utils\ModuleUtils\SETTING_RULES;
 
-function loader($module): array
+function loader(array $module): array
 {
     $module[SETTING_RULES] = 'What is the result of the expression?';
     $module[HANDLER_QUESTION] = static fn() => handler();
diff --git a/src/Games/EvenGame.php b/src/Games/EvenGame.php
index b0b4c73..9d9f2b6 100644
--- a/src/Games/EvenGame.php
+++ b/src/Games/EvenGame.php
@@ -5,7 +5,7 @@
 use const BrainGames\Utils\ModuleUtils\HANDLER_QUESTION;
 use const BrainGames\Utils\ModuleUtils\SETTING_RULES;
 
-function loader($module): array
+function loader(array $module): array
 {
     $module[SETTING_RULES] = 'Answer "yes" if the number is even, otherwise answer "no".';
     $module[HANDLER_QUESTION] = static fn() => handler();
diff --git a/src/Games/GcdGame.php b/src/Games/GcdGame.php
index f6f5a36..44b57e7 100644
--- a/src/Games/GcdGame.php
+++ b/src/Games/GcdGame.php
@@ -5,7 +5,7 @@
 use const BrainGames\Utils\ModuleUtils\HANDLER_QUESTION;
 use const BrainGames\Utils\ModuleUtils\SETTING_RULES;
 
-function loader($module): array
+function loader(array $module): array
 {
     $module[SETTING_RULES] = 'Find the greatest common divisor of given numbers.';
     $module[HANDLER_QUESTION] = static fn() => handler();
@@ -21,7 +21,7 @@ function handler(): array
     return [$question, $expectedAnswer];
 }
 
-function gcd($a, $b): int
+function gcd(int $a, int $b): int
 {
     return $b === 0 ? $a : gcd($b, $a % $b);
 }
diff --git a/src/Games/PrimeGame.php b/src/Games/PrimeGame.php
index f182832..23ea369 100644
--- a/src/Games/PrimeGame.php
+++ b/src/Games/PrimeGame.php
@@ -5,7 +5,7 @@
 use const BrainGames\Utils\ModuleUtils\HANDLER_QUESTION;
 use const BrainGames\Utils\ModuleUtils\SETTING_RULES;
 
-function loader($module): array
+function loader(array $module): array
 {
     $module[SETTING_RULES] = 'Answer "yes" if given number is prime. Otherwise answer "no".';
     $module[HANDLER_QUESTION] = static fn() => handler();
@@ -19,7 +19,7 @@ function handler(): array
     return [$question, $isPrime ? 'yes' : 'no'];
 }
 
-function isPrime($number): bool
+function isPrime(int $number): bool
 {
     if ($number <= 1) {
         return false;
diff --git a/src/Games/ProgressionGame.php b/src/Games/ProgressionGame.php
index df2d93f..0afa002 100644
--- a/src/Games/ProgressionGame.php
+++ b/src/Games/ProgressionGame.php
@@ -5,7 +5,7 @@
 use const BrainGames\Utils\ModuleUtils\HANDLER_QUESTION;
 use const BrainGames\Utils\ModuleUtils\SETTING_RULES;
 
-function loader($module): array
+function loader(array $module): array
 {
     $module[SETTING_RULES] = 'What number is missing in the progression?';
     $module[HANDLER_QUESTION] = static fn() => handler();
diff --git a/src/Utils/ModuleUtils.php b/src/Utils/ModuleUtils.php
index 977c1ee..c87f085 100644
--- a/src/Utils/ModuleUtils.php
+++ b/src/Utils/ModuleUtils.php
@@ -19,36 +19,37 @@
  *     1: string
  * }
  */
-function getQuestionAnswerPairHandler($module): array
+function getQuestionAnswerPairHandler(array $module): array
 {
     return $module[HANDLER_QUESTION]();
 }
 
-function getRulesDescription($module): string
+function getRulesDescription(array $module): string
 {
     return $module[SETTING_RULES];
 }
 
-function getText($module, $key, $replace_pairs = []): string
+function getText(array $module, string $key, array $replacePairs = []): string
 {
     $texts = getTexts($module);
     $keys = explode('.', $key);
+    /** @var string $text */
     $text = array_reduce($keys, fn($tail, $key) => is_array($tail) ? ($tail[$key] ?? '') : $tail, $texts);
-    return strtr($text, $replace_pairs);
+    return strtr($text, $replacePairs);
 }
 
-function setUserName($module, $userName): array
+function setUserName(array $module, string $userName): array
 {
     $module[LOCATION_DATA][DATA_USER_NAME] = $userName;
     return $module;
 }
 
-function getUserName($module): string
+function getUserName(array $module): string
 {
     return $module[LOCATION_DATA][DATA_USER_NAME];
 }
 
-function getTexts($module): array
+function getTexts(array $module): array
 {
     return $module[LOCATION_TEXTS];
 }