web\AssetManager $bundles

List of asset bundle configurations. This property is provided to customize asset bundles. When a bundle is being loaded by getBundle(), if it has a corresponding configuration specified here, the configuration will be applied to the bundle.

The array keys are the asset bundle names, which typically are asset bundle class names without leading backslash. The array values are the corresponding configurations. If a value is false, it means the corresponding asset bundle is disabled and getBundle() should return null.

If this property is false, it means the whole asset bundle feature is disabled and getBundle() will always return null.

The following example shows how to disable the bootstrap css file used by Bootstrap widgets (because you want to use your own styles):

[
    'yii\bootstrap\BootstrapAsset' => [
        'css' => [],
    ],
]