album_cpt.php

<?php
function register_album_cpt() {

	$labels = array(
		'name'                  => _x( 'Albums', 'Post Type General Name', 'smolblog' ),
		'singular_name'         => _x( 'Album', 'Post Type Singular Name', 'smolblog' ),
		'menu_name'             => __( 'Albums', 'smolblog' ),
		'name_admin_bar'        => __( 'Album', 'smolblog' ),
		'archives'              => __( 'Album Archives', 'smolblog' ),
		'attributes'            => __( 'Album Attributes', 'smolblog' ),
		'parent_item_colon'     => __( 'Parent Album:', 'smolblog' ),
		'all_items'             => __( 'All Albums', 'smolblog' ),
		'add_new_item'          => __( 'Add New Album', 'smolblog' ),
		'add_new'               => __( 'Add New', 'smolblog' ),
		'new_item'              => __( 'New Album', 'smolblog' ),
		'edit_item'             => __( 'Edit Album', 'smolblog' ),
		'update_item'           => __( 'Update Album', 'smolblog' ),
		'view_item'             => __( 'View Album', 'smolblog' ),
		'view_items'            => __( 'View Albums', 'smolblog' ),
		'search_items'          => __( 'Search Album', 'smolblog' ),
		'not_found'             => __( 'Not found', 'smolblog' ),
		'not_found_in_trash'    => __( 'Not found in Trash', 'smolblog' ),
		'featured_image'        => __( 'Album Cover', 'smolblog' ),
		'set_featured_image'    => __( 'Set album cover', 'smolblog' ),
		'remove_featured_image' => __( 'Remove album cover', 'smolblog' ),
		'use_featured_image'    => __( 'Use as album cover', 'smolblog' ),
		'insert_into_item'      => __( 'Insert into album', 'smolblog' ),
		'uploaded_to_this_item' => __( 'Uploaded to this album', 'smolblog' ),
		'items_list'            => __( 'Albums list', 'smolblog' ),
		'items_list_navigation' => __( 'Albums list navigation', 'smolblog' ),
		'filter_items_list'     => __( 'Filter albums list', 'smolblog' ),
	);
	$args = array(
		'label'                 => __( 'Album', 'smolblog' ),
		'description'           => __( 'A musical release', 'smolblog' ),
		'labels'                => $labels,
		'supports'              => array( 'title', 'editor', 'thumbnail', 'custom-fields' ),
		'taxonomies'            => array( 'post_tag' ),
		'hierarchical'          => false,
		'public'                => true,
		'show_ui'               => true,
		'show_in_menu'        => true,
		'menu_position'       => 5,
		'menu_icon'           => 'dashicons-format-audio',
		'show_in_admin_bar'   => true,
		'show_in_nav_menus'   => true,
		'can_export'          => true,
		'has_archive'         => true,
		'exclude_from_search' => false,
		'publicly_queryable'  => true,
		'capability_type'     => 'post',
		'show_in_rest'        => true,
		'show_in_graphql'     => true,
		'graphql_single_name' => 'album',
		'graphql_plural_name' => 'albums',
	);
	register_post_type( 'album', $args );

}