class aliases are loaded on demand [Closes #226]

composer.json

@@ -32,8 +32,7 @@
 		"nette/bootstrap": "<3.0"
 	},
 	"autoload": {
-		"classmap": ["src/"],
-		"files": ["src/compatibility.php"]
+		"classmap": ["src/"]
 	},
 	"minimum-stability": "dev",
 	"scripts": {

src/DI/Config/Adapter.php

@@ -25,3 +25,6 @@ function load(string $file): array;
 	 */
 	function dump(array $data): string;
 }
+
+
+class_exists(IAdapter::class);

src/DI/Definitions/ServiceDefinition.php

@@ -250,3 +250,6 @@ public function __clone()
 		$this->setup = unserialize(serialize($this->setup));
 	}
 }
+
+
+class_exists(Nette\DI\ServiceDefinition::class);

src/DI/Definitions/Statement.php

@@ -70,3 +70,6 @@ public function getEntity()
 		return $this->entity;
 	}
 }
+
+
+class_exists(Nette\DI\Statement::class);

src/compatibility.php

@@ -7,6 +7,33 @@
 
 declare(strict_types=1);
 
-class_alias(Nette\DI\Config\Adapter::class, Nette\DI\Config\IAdapter::class);
-class_alias(Nette\DI\Definitions\Statement::class, Nette\DI\Statement::class);
-class_alias(Nette\DI\Definitions\ServiceDefinition::class, Nette\DI\ServiceDefinition::class);
+namespace Nette\DI\Config {
+	if (false) {
+		/** @deprecated use Nette\DI\Config\Adapter */
+		interface IAdapter
+		{
+		}
+	} elseif (!interface_exists(IAdapter::class)) {
+		class_alias(Adapter::class, IAdapter::class);
+	}
+}
+
+namespace Nette\DI {
+	if (false) {
+		/** @deprecated use Nette\DI\Definitions\ServiceDefinition */
+		class ServiceDefinition
+		{
+		}
+	} elseif (!class_exists(ServiceDefinition::class)) {
+		class_alias(Definitions\ServiceDefinition::class, ServiceDefinition::class);
+	}
+
+	if (false) {
+		/** @deprecated use Nette\DI\Definitions\Statement */
+		class Statement
+		{
+		}
+	} elseif (!class_exists(Statement::class)) {
+		class_alias(Definitions\Statement::class, Statement::class);
+	}
+}