Reaching phpstan level 6 in Composer\IO (#10166)

src/Composer/IO/BaseIO.php

@@ -30,7 +30,7 @@ abstract class BaseIO implements IOInterface
     }
 
     /**
-     * {@inheritDoc}
+     * @return void
      */
     public function resetAuthentications()
     {
@@ -87,6 +87,8 @@ abstract class BaseIO implements IOInterface
      * @param string $repositoryName The unique name of repository
      * @param string $username       The username
      * @param string $password       The password
+     *
+     * @return void
      */
     protected function checkAndSetAuthentication($repositoryName, $username, $password = null)
     {

src/Composer/IO/BufferIO.php

@@ -46,6 +46,9 @@ class BufferIO extends ConsoleIO
         )));
     }
 
+    /**
+     * @return string output
+     */
     public function getOutput()
     {
         fseek($this->output->getStream(), 0);
@@ -66,6 +69,13 @@ class BufferIO extends ConsoleIO
         return $output;
     }
 
+    /**
+     * @param string[] $inputs
+     *
+     * @see createStream
+     *
+     * @return void
+     */
     public function setUserInputs(array $inputs)
     {
         if (!$this->input instanceof StreamableInputInterface) {
@@ -76,6 +86,11 @@ class BufferIO extends ConsoleIO
         $this->input->setInteractive(true);
     }
 
+    /**
+     * @param string[] $inputs
+     *
+     * @return false|resource stream
+     */
     private function createStream(array $inputs)
     {
         $stream = fopen('php://memory', 'r+');

src/Composer/IO/ConsoleIO.php

@@ -68,6 +68,8 @@ class ConsoleIO extends BaseIO
 
     /**
      * @param float $startTime
+     *
+     * @return void
      */
     public function enableDebugging($startTime)
     {
@@ -147,10 +149,13 @@ class ConsoleIO extends BaseIO
     }
 
     /**
-     * @param array|string $messages
-     * @param bool         $newline
-     * @param bool         $stderr
-     * @param int          $verbosity
+     * @param string[]|string $messages
+     * @param bool                 $newline
+     * @param bool                 $stderr
+     * @param int                  $verbosity
+     * @param bool                 $raw
+     *
+     * @return void
      */
     private function doWrite($messages, $newline, $stderr, $verbosity, $raw = false)
     {
@@ -203,11 +208,13 @@ class ConsoleIO extends BaseIO
     }
 
     /**
-     * @param array|string $messages
+     * @param string[]|string $messages
      * @param bool         $newline
      * @param int|null     $size
      * @param bool         $stderr
      * @param int          $verbosity
+     *
+     * @return void
      */
     private function doOverwrite($messages, $newline, $size, $stderr, $verbosity)
     {