PluginAssetsTrait.php

<?php
trait PluginAssetsTrait
{
    protected function getPluginVersion()
    {
        static $manifest = null;
        if ($manifest === null) {
            $manifest = $this->getMetadata();
        }
        return $manifest['version'];
    }

    protected function addScript($asset)
    {
        $asset = ltrim($asset, '/');
        PageLayout::addScript("{$this->getPluginURL()}/{$asset}?v={$this->getPluginVersion()}");
    }
}