Registers all of the default WordPress widgets on startup.

Calls {@see ‘widgets_init’} action after all of the WordPress widgets have been registered.

function wp_widgets_init() {
	if ( ! is_blog_installed() ) {
		return;
	}

	register_widget( 'WP_Widget_Pages' );

	register_widget( 'WP_Widget_Calendar' );

	register_widget( 'WP_Widget_Archives' );

	if ( get_option( 'link_manager_enabled' ) ) {
		register_widget( 'WP_Widget_Links' );
	}

	register_widget( 'WP_Widget_Media_Audio' );

	register_widget( 'WP_Widget_Media_Image' );

	register_widget( 'WP_Widget_Media_Gallery' );

	register_widget( 'WP_Widget_Media_Video' );

	register_widget( 'WP_Widget_Meta' );

	register_widget( 'WP_Widget_Search' );

	register_widget( 'WP_Widget_Text' );

	register_widget( 'WP_Widget_Categories' );

	register_widget( 'WP_Widget_Recent_Posts' );

	register_widget( 'WP_Widget_Recent_Comments' );

	register_widget( 'WP_Widget_RSS' );

	register_widget( 'WP_Widget_Tag_Cloud' );

	register_widget( 'WP_Nav_Menu_Widget' );

	register_widget( 'WP_Widget_Custom_HTML' );

	register_widget( 'WP_Widget_Block' );

	/**
	 * Fires after all default WordPress widgets have been registered.
	 *
	 * @since 2.2.0
	 */
	do_action( 'widgets_init' );
}