Custom post type and ACF generator

<?php

add_action( 'init', function () {
    register_post_type( 'book', array(
        'labels'       => array(
            'name' => __( 'Books', 'my-theme' ),
            'singular_name' => __( 'Book', 'my-theme' ),
            'add_new_item' => __( 'Add New Book', 'my-theme' ),
            'edit_item' => __( 'Edit Book', 'my-theme' ),
            'new_item' => __( 'New Book', 'my-theme' ),
            'view_item' => __( 'View Book', 'my-theme' ),
            'search_items' => __( 'Search Books', 'my-theme' ),
            'not_found' => __( 'No books found', 'my-theme' ),
            'not_found_in_trash' => __( 'No books found in Trash', 'my-theme' ),
            'all_items' => __( 'All Books', 'my-theme' ),
        ),
        'public'       => true,
        'has_archive'  => true,
        'hierarchical' => false,
        'show_in_rest' => true,
        'menu_icon'    => 'dashicons-book',
        'supports'     => array( 'title', 'editor', 'thumbnail' ),
    ) );
} );