#craftcms get field type in craftcms 3

getfieldtype.php

<!-- In service file  -->

public function getFieldType($fieldName='')
    {
        if ($fieldName === '') {
            return null;
        }

        $fieldType = (new Query())
             ->select(['type'])
             ->from(['{{%fields}}'])
             ->where(['handle' => $fieldName])
             ->one();

        return $fieldType;
}
<!--  Now call this function anywhere in your plugin -->

$fieldType = CraftAjaxinate::$plugin->craftAjaxinateService->getFieldType('handleName');