base\Application $extensions

List of installed Yii extensions. Each array element represents a single extension with the following structure:

[
    'name' => 'extension name',
    'version' => 'version number',
    'bootstrap' => 'BootstrapClassName',  // optional, may also be a configuration array
    'alias' => [
        '@alias1' => 'to/path1',
        '@alias2' => 'to/path2',
    ],
]

The "bootstrap" class listed above will be instantiated during the application bootstrapping process. If the class implements yii\base\BootstrapInterface, its bootstrap() method will be also be called.

If not set explicitly in the application config, this property will be populated with the contents of @vendor/yiisoft/extensions.php.