WP_Compat::__construct()

	public function __construct() {

		if ( null === self::$blocks_compatibility_level ) {
			self::$blocks_compatibility_level = (int) get_option( 'blocks_compatibility_level', 1 );
		}

		add_action( 'update_option_blocks_compatibility_level', array( $this, 'purge_options' ), 10, 2 );

		$this->define_polyfills();

		if ( 1 === self::$blocks_compatibility_level ) {
			return;
		}

		// Define hooks to be used to warn users.
		add_action( 'after_plugin_row', array( $this, 'using_block_function_row' ), 10, 2 );
		add_action( 'upgrader_process_complete', array( $this, 'update_extensions_using_blocks' ), 10, 2 );
		add_action( 'delete_plugin', array( $this, 'delete_plugins_using_blocks' ), 10, 1 );
		add_action( 'admin_notices', array( $this, 'using_block_function_theme' ), 10, 0 );
		add_action( 'after_switch_theme', array( $this, 'delete_themes_using_blocks' ), 10, 0 );

		// ClassicPress Site Health block compatibility debug.
		require_once ABSPATH . WPINC . '/classicpress/class-cp-debug-compat.php';
	}