diff --git a/libs/cli-utils/example/down.php b/libs/cli-utils/example/down.php
index 33a76d9..271c5e0 100644
--- a/libs/cli-utils/example/down.php
+++ b/libs/cli-utils/example/down.php
@@ -9,7 +9,7 @@
 
 $app  = new \Toolkit\Cli\App();
 $url  = 'http://no2.php.net/distributions/php-7.2.5.tar.bz2';
-$down = Download::create($url, '');
+$down = Download::create($url);
 
 $type = $app->getOpt('type', 'text');
 
diff --git a/libs/cli-utils/src/App.php b/libs/cli-utils/src/App.php
index 66434cd..5bf08bf 100644
--- a/libs/cli-utils/src/App.php
+++ b/libs/cli-utils/src/App.php
@@ -28,7 +28,7 @@ class App
     private $opts = [];
 
     /** @var string */
-    private $script = '';
+    private $script;
 
     /** @var string */
     private $command = '';
@@ -68,7 +68,7 @@ public function __construct(array $argv = null)
      * @param bool $exit
      * @throws \InvalidArgumentException
      */
-    public function run(bool $exit = true)
+    public function run(bool $exit = true): void
     {
         if (isset($this->args[0])) {
             $this->command = $this->args[0];
@@ -82,7 +82,7 @@ public function run(bool $exit = true)
      * @param bool $exit
      * @throws \InvalidArgumentException
      */
-    public function dispatch(bool $exit = true)
+    public function dispatch(bool $exit = true): void
     {
         if (!$command = $this->command) {
             $this->displayHelp();
@@ -109,7 +109,7 @@ public function dispatch(bool $exit = true)
     /**
      * @param int $code
      */
-    public function stop($code = 0)
+    public function stop($code = 0): void
     {
         exit((int)$code);
     }
@@ -172,7 +172,7 @@ protected function handleException(\Throwable $e): int
      * @param string   $description
      * @throws \InvalidArgumentException
      */
-    public function addCommand(string $command, callable $handler, string $description = '')
+    public function addCommand(string $command, callable $handler, string $description = ''): void
     {
         if (!$command || !$handler) {
             throw new \InvalidArgumentException('Invalid arguments');
@@ -186,7 +186,7 @@ public function addCommand(string $command, callable $handler, string $descripti
      * @param array $commands
      * @throws \InvalidArgumentException
      */
-    public function commands(array $commands)
+    public function commands(array $commands): void
     {
         foreach ($commands as $command => $handler) {
             $des = '';
@@ -208,7 +208,7 @@ public function commands(array $commands)
     /**
      * @param string $err
      */
-    public function displayHelp(string $err = '')
+    public function displayHelp(string $err = ''): void
     {
         if ($err) {
             echo Color::render("<red>ERROR</red>: $err\n\n");
@@ -263,7 +263,7 @@ public function getArgs(): array
     /**
      * @param array $args
      */
-    public function setArgs(array $args)
+    public function setArgs(array $args): void
     {
         $this->args = $args;
     }
@@ -279,7 +279,7 @@ public function getOpts(): array
     /**
      * @param array $opts
      */
-    public function setOpts(array $opts)
+    public function setOpts(array $opts): void
     {
         $this->opts = $opts;
     }
@@ -295,7 +295,7 @@ public function getScript(): string
     /**
      * @param string $script
      */
-    public function setScript(string $script)
+    public function setScript(string $script): void
     {
         $this->script = $script;
     }
@@ -311,7 +311,7 @@ public function getCommand(): string
     /**
      * @param string $command
      */
-    public function setCommand(string $command)
+    public function setCommand(string $command): void
     {
         $this->command = $command;
     }
diff --git a/libs/cli-utils/src/Cli.php b/libs/cli-utils/src/Cli.php
index 96ca5f9..54a47fd 100644
--- a/libs/cli-utils/src/Cli.php
+++ b/libs/cli-utils/src/Cli.php
@@ -38,7 +38,7 @@ public static function read($message = null, $nl = false): string
      * @param bool $nl
      * @param bool $quit
      */
-    public static function write($messages, $nl = true, $quit = false)
+    public static function write($messages, $nl = true, $quit = false): void
     {
         if (\is_array($messages)) {
             $messages = implode($nl ? \PHP_EOL : '', $messages);
@@ -53,7 +53,7 @@ public static function write($messages, $nl = true, $quit = false)
      * @param bool     $nl
      * @param bool|int $quit
      */
-    public static function stdout(string $message, $nl = true, $quit = false)
+    public static function stdout(string $message, $nl = true, $quit = false): void
     {
         fwrite(\STDOUT, $message . ($nl ? \PHP_EOL : ''));
         fflush(\STDOUT);
@@ -70,7 +70,7 @@ public static function stdout(string $message, $nl = true, $quit = false)
      * @param bool     $nl
      * @param bool|int $quit
      */
-    public static function stderr(string $message, $nl = true, $quit = -1)
+    public static function stderr(string $message, $nl = true, $quit = -1): void
     {
         fwrite(\STDERR, self::color('[ERROR] ', 'red') . $message . ($nl ? PHP_EOL : ''));
         fflush(\STDOUT);
diff --git a/libs/cli-utils/src/Console.php b/libs/cli-utils/src/Console.php
index bbd7cfa..e7d2ccf 100644
--- a/libs/cli-utils/src/Console.php
+++ b/libs/cli-utils/src/Console.php
@@ -36,7 +36,7 @@ class Console extends Cli
      *  'coId' => 12,
      * ]
      */
-    public static function log(string $msg, array $data = [], string $type = 'info', array $opts = [])
+    public static function log(string $msg, array $data = [], string $type = 'info', array $opts = []): void
     {
         if (isset(self::LOG_LEVEL2TAG[$type])) {
             $type = ColorTag::add(\strtoupper($type), self::LOG_LEVEL2TAG[$type]);
diff --git a/libs/cli-utils/src/Download.php b/libs/cli-utils/src/Download.php
index e3e44cd..22c7dc4 100644
--- a/libs/cli-utils/src/Download.php
+++ b/libs/cli-utils/src/Download.php
@@ -35,7 +35,7 @@ final class Download
      * @param string $type
      * @return Download
      */
-    public static function create(string $url, string $saveAs = '', string $type = self::PROGRESS_TEXT)
+    public static function create(string $url, string $saveAs = '', string $type = self::PROGRESS_TEXT): Download
     {
         return new self($url, $saveAs, $type);
     }
@@ -122,7 +122,7 @@ public function start(): self
      * @param int    $transferredBytes Have been transferred bytes
      * @param int    $maxBytes Target max length bytes
      */
-    public function progressShow($notifyCode, $severity, $message, $messageCode, $transferredBytes, $maxBytes)
+    public function progressShow($notifyCode, $severity, $message, $messageCode, $transferredBytes, $maxBytes): void
     {
         $msg = '';
 
@@ -205,7 +205,7 @@ public function getShowType(): string
     /**
      * @param string $showType
      */
-    public function setShowType(string $showType)
+    public function setShowType(string $showType): void
     {
         $this->showType = $showType;
     }
@@ -221,7 +221,7 @@ public function getUrl(): string
     /**
      * @param string $url
      */
-    public function setUrl(string $url)
+    public function setUrl(string $url): void
     {
         $this->url = \trim($url);
     }
@@ -237,7 +237,7 @@ public function getSaveAs(): string
     /**
      * @param string $saveAs
      */
-    public function setSaveAs(string $saveAs)
+    public function setSaveAs(string $saveAs): void
     {
         $this->saveAs = \trim($saveAs);
     }
diff --git a/libs/cli-utils/src/Flags.php b/libs/cli-utils/src/Flags.php
index 051601a..0f4be6a 100644
--- a/libs/cli-utils/src/Flags.php
+++ b/libs/cli-utils/src/Flags.php
@@ -36,13 +36,13 @@ public static function simpleParseArgv(array $argv): array
                 }
 
                 if (\strpos($value, '=')) {
-                    list($n, $v) = \explode('=', $value);
+                    [$n, $v] = \explode('=', $value);
                     $opts[$n] = $v;
                 } else {
                     $opts[$value] = true;
                 }
             } elseif (\strpos($value, '=')) {
-                list($n, $v) = \explode('=', $value);
+                [$n, $v] = \explode('=', $value);
                 $args[$n] = $v;
             } else {
                 $args[] = $value;
@@ -122,12 +122,12 @@ public static function parseArgv(array $params, array $config = []): array
 
                     // long-opt: value specified inline (--<opt>=<value>)
                     if (\strpos($option, '=') !== false) {
-                        list($option, $value) = \explode('=', $option, 2);
+                        [$option, $value] = \explode('=', $option, 2);
                     }
 
                     // short-opt: value specified inline (-<opt>=<value>)
                 } elseif (isset($option{1}) && $option{1} === '=') {
-                    list($option, $value) = \explode('=', $option, 2);
+                    [$option, $value] = \explode('=', $option, 2);
                 }
 
                 // check if next parameter is a descriptor or a value
@@ -170,7 +170,7 @@ public static function parseArgv(array $params, array $config = []): array
 
             // value specified inline (<arg>=<value>)
             if (\strpos($p, '=') !== false) {
-                list($name, $value) = \explode('=', $p, 2);
+                [$name, $value] = \explode('=', $p, 2);
                 $args[$name] = self::filterBool($value);
             } else {
                 $args[] = $p;
@@ -232,7 +232,7 @@ public static function parseArray(array $params): array
      * @todo ...
      * @param string $string
      */
-    public static function parseString(string $string)
+    public static function parseString(string $string): void
     {
 
     }
diff --git a/libs/cli-utils/src/Highlighter.php b/libs/cli-utils/src/Highlighter.php
index c68a10e..dc166f8 100644
--- a/libs/cli-utils/src/Highlighter.php
+++ b/libs/cli-utils/src/Highlighter.php
@@ -250,7 +250,7 @@ private function colorLines(array $tokenLines): array
 
         foreach ($tokenLines as $lineCount => $tokenLine) {
             $line = '';
-            foreach ($tokenLine as list($tokenType, $tokenValue)) {
+            foreach ($tokenLine as [$tokenType, $tokenValue]) {
                 $style = $this->defaultTheme[$tokenType];
 
                 if (Color::hasStyle($style)) {
@@ -308,7 +308,7 @@ public function getDefaultTheme(): array
     /**
      * @param array $defaultTheme
      */
-    public function setDefaultTheme(array $defaultTheme)
+    public function setDefaultTheme(array $defaultTheme): void
     {
         $this->defaultTheme = \array_merge($this->defaultTheme, $defaultTheme);
     }
diff --git a/libs/cli-utils/src/Terminal.php b/libs/cli-utils/src/Terminal.php
index 4e72888..096a0a8 100644
--- a/libs/cli-utils/src/Terminal.php
+++ b/libs/cli-utils/src/Terminal.php
@@ -157,7 +157,7 @@ public static function build($format, $type = 'm'): string
     public function cursor($typeName, $arg1 = 1, $arg2 = null): self
     {
         if (!isset(self::$ctrlCursorCodes[$typeName])) {
-            Cli::stderr("The [$typeName] is not supported cursor control.", true);
+            Cli::stderr("The [$typeName] is not supported cursor control.");
         }
 
         $code = self::$ctrlCursorCodes[$typeName];
@@ -208,7 +208,7 @@ public function screen(string $typeName, $arg = null): self
         return $this;
     }
 
-    public function reset()
+    public function reset(): void
     {
         echo self::END_CHAR;
     }
diff --git a/libs/cli-utils/test/ColorTagTest.php b/libs/cli-utils/test/ColorTagTest.php
index 25ac519..223589a 100644
--- a/libs/cli-utils/test/ColorTagTest.php
+++ b/libs/cli-utils/test/ColorTagTest.php
@@ -17,7 +17,7 @@
  */
 class ColorTagTest extends TestCase
 {
-    public function testStrip()
+    public function testStrip(): void
     {
         $text = ColorTag::strip('<tag>text</tag>');
         $this->assertSame('text', $text);
@@ -27,7 +27,7 @@ public function testStrip()
         $this->assertSame('<tag>text<tag>', $text);
     }
 
-    public function testWrap()
+    public function testWrap(): void
     {
         $text = ColorTag::wrap('text', 'tag');
         $this->assertSame('<tag>text</tag>', $text);
@@ -39,7 +39,7 @@ public function testWrap()
         $this->assertSame('', $text);
     }
 
-    public function testExists()
+    public function testExists(): void
     {
         $this->assertTrue(ColorTag::exists('<tag>text</tag>'));
         $this->assertFalse(ColorTag::exists('text'));