YiiRocks/yii2-fontawesome-inline

<?php

namespace thoulah\fontawesome\bootstrap4;

/**
 * A Font Awesome enhanced version of \yii\bootstrap4\ActiveForm.
 */
class ActiveForm extends \yii\bootstrap4\ActiveForm
{
    /** @var string Tells Yii to use this ActiveField class. */
    public $fieldClass = 'thoulah\fontawesome\bootstrap4\ActiveField';
}