vue-wp/plugins/cia-endpoints/includes/class.make-terms.php

<?php
// include('formats.php');

class Make_Terms_Endpoint extends WP_REST_Controller {
    function make_args($request, $post_type) {
        $args = [
            'post_type'       => $post_type,
            'post_status'     => ['publish'],
            'posts_per_page'  => -1,
            'page'            => 1
        ];
    }
    /**
     * Register the routes for the objects of the controller.
     */
    public function register_custom_route($route) {
        $version = '2';
        $namespace = 'craft/v' . $version;

        register_rest_route( $namespace, '/' . $route, [
            array(
                'methods'  => WP_REST_Server::READABLE,
                'callback' => array( $this, 'get_all_terms' )
            ),
        ]);
    }
    public function get_all_terms( $request ) {

        $terms = $categories = get_terms($post->post_type . '_type', array(
            'orderby'    => 'count',
            'hide_empty' => 0,
        ));
        $taxonomies = get_object_taxonomies($post->post_type);
        $formatted[terms] = $terms;
        $formatted[taxonomies] = $taxonomies;

        return new WP_REST_Response( $this->prepare_all_items_for_response($args), 200 );
    }

    public function prepare_all_items_for_response( $args ) {
        $collection = [];
        
        // https://developer.wordpress.org/reference/functions/get_posts/
        foreach( get_posts($args) as $item ) {
            $formatted = default_post_format( $item, true );
            array_push($collection, $formatted);
        }
        wp_reset_postdata();

        return $collection;
    }
}

?>