Version 2.0.0 of assets package was released improving public API for more convenient use.

Previously you had to specify assets registered as array:

$assetManager->register([\App\Assets\MainAsset::class]);

First version of assets package was released. The package implements client-side asset (such as CSS and JavaScript) management for PHP. It helps resolve dependencies and get lists of files ready for generating HTML <script> and <link> tags.

Detailed usage guide is available [in the package readme]https://github.com/yiisoft/assets/blob/1.0.0/README.md#general-usage().