WP_Compat::define_polyfills()

	private function define_polyfills() {
		// Polyfills that must not have to be defined elsewhere go there.
		if ( ! function_exists( 'register_block_type' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function register_block_type( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'unregister_block_type' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function unregister_block_type( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'register_block_type_from_metadata' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function register_block_type_from_metadata( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'has_block' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function has_block( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'has_blocks' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function has_blocks( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'register_block_pattern' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function register_block_pattern( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'unregister_block_pattern' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function unregister_block_pattern( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'register_block_pattern_category' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function register_block_pattern_category( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'unregister_block_pattern_category' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function unregister_block_pattern_category( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'wp_is_block_theme' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.0.0
			 *
			 * @return bool False.
			 */
			function wp_is_block_theme( ...$args ) {
				WP_Compat::using_block_function();
				return false;
			}
		}

		if ( ! function_exists( 'parse_blocks' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.2.0
			 *
			 * @return array array().
			 */
			function parse_blocks( ...$args ) {
				WP_Compat::using_block_function();
				return array();
			}
		}

		if ( ! function_exists( 'get_dynamic_block_names' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.2.0
			 *
			 * @return string ''.
			 */
			function get_dynamic_block_names( ...$args ) {
				WP_Compat::using_block_function();
				return '';
			}
		}

		if ( ! function_exists( 'get_block_theme_folders' ) ) {
			/**
			 * Polyfill for block functions.
			 *
			 * @since CP-2.3.0
			 *
			 * @return string ''.
			 */
			function get_block_theme_folders( ...$args ) {
				WP_Compat::using_block_function();
				return '';
			}
		}

		// Load WP_Block_Type class file as polyfill.
		require_once ABSPATH . WPINC . '/classicpress/class-wp-block-type.php';
		require_once ABSPATH . WPINC . '/classicpress/class-wp-block-template.php';
	}