[WebServerBundle] Deprecate relying on --env in server:start and server:run

UPGRADE-4.2.md

@@ -231,3 +231,9 @@ Validator
  * Using the `Bic`, `Country`, `Currency`, `Language` and `Locale` constraints without `symfony/intl` is deprecated
  * Using the `Email` constraint without `egulias/email-validator` is deprecated
  * Using the `Expression` constraint without `symfony/expression-language` is deprecated
+
+WebServerBundle
+---------------
+
+* Omitting the `$environment` argument of the `ServerRunCommand` and 
+  `ServerStartCommand` constructors is deprecated.

UPGRADE-5.0.md

@@ -222,3 +222,9 @@ Workflow
  * `add` method has been removed use `addWorkflow` method in `Workflow\Registry` instead.
  * `SupportStrategyInterface` has been removed, use `WorkflowSupportStrategyInterface` instead.
  * `ClassInstanceSupportStrategy` has been removed, use `InstanceOfSupportStrategy` instead.
+
+WebServerBundle
+---------------
+
+* Omitting the `$environment` argument of  the `ServerRunCommand` and
+  `ServerStartCommand` constructors now throws a `\TypeError.

src/Symfony/Bundle/WebServerBundle/CHANGELOG.md

@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+4.2.0
+-----
+
+* Deprecated omitting the `$environment` argument of the `ServerRunCommand` and
+ `ServerStartCommand` constructors
+
 3.4.0
 -----
 

src/Symfony/Bundle/WebServerBundle/Command/ServerRunCommand.php

@@ -36,6 +36,10 @@ class ServerRunCommand extends Command
 
     public function __construct(string $documentRoot = null, string $environment = null)
     {
+        if (!$environment) {
+            @trigger_error(sprintf('Omitting the $environment argument of the "%s" constructor is deprecated since Symfony 4.2.', __CLASS__), E_USER_DEPRECATED);
+        }
+
         $this->documentRoot = $documentRoot;
         $this->environment = $environment;
 
@@ -99,6 +103,7 @@ EOF
             $documentRoot = $this->documentRoot;
         }
 
+        // @deprecated since Symfony 4.2
         if (!$env = $this->environment) {
             if ($input->hasOption('env') && !$env = $input->getOption('env')) {
                 $io->error('The environment must be either passed as second argument of the constructor or through the "--env" input option.');

src/Symfony/Bundle/WebServerBundle/Command/ServerStartCommand.php

@@ -36,6 +36,10 @@ class ServerStartCommand extends Command
 
     public function __construct(string $documentRoot = null, string $environment = null)
     {
+        if (!$environment) {
+            @trigger_error(sprintf('Omitting the $environment argument of the "%s" constructor is deprecated since Symfony 4.2.', __CLASS__), E_USER_DEPRECATED);
+        }
+
         $this->documentRoot = $documentRoot;
         $this->environment = $environment;
 
@@ -112,6 +116,7 @@ EOF
             $documentRoot = $this->documentRoot;
         }
 
+        // @deprecated since Symfony 4.2
         if (!$env = $this->environment) {
             if ($input->hasOption('env') && !$env = $input->getOption('env')) {
                 $io->error('The environment must be either passed as second argument of the constructor or through the "--env" input option.');