yii2-bootstrap/framework/yii/assets.php

<?php

return [
	yii\web\YiiAsset::className(),
	yii\web\JqueryAsset::className(),
	yii\validators\PunycodeAsset::className(),
	yii\validators\ValidationAsset::className(),
	yii\widgets\ActiveFormAsset::className(),
	yii\captcha\CaptchaAsset::className(),
	yii\widgets\MaskedInputAsset::className(),
];