plugins/wp-job-manager/wp-job-manager-functions.php

function get_job_listing_types( $fields = 'all' ) {
    if ( ! get_option( 'job_manager_enable_types' ) ) {
        return array();
    } else {
        return get_terms( "job_listing_type", array(
            'orderby'    => 'name',
            'order'      => 'ASC',
            'hide_empty' => false,
            'fields'     => $fields
        ) );
    }
}