GC_Block_Type_Registry::register()

	public function register( $name, $args = array() ) {
		$block_type = null;
		if ( $name instanceof GC_Block_Type ) {
			$block_type = $name;
			$name       = $block_type->name;
		}

		if ( ! is_string( $name ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Block type names must be strings.' ),
				'5.0.0'
			);
			return false;
		}

		if ( preg_match( '/[A-Z]+/', $name ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Block type names must not contain uppercase characters.' ),
				'5.0.0'
			);
			return false;
		}

		$name_matcher = '/^[a-z0-9-]+/[a-z0-9-]+$/';
		if ( ! preg_match( $name_matcher, $name ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Block type names must contain a namespace prefix. Example: my-plugin/my-custom-block-type' ),
				'5.0.0'
			);
			return false;
		}

		if ( $this->is_registered( $name ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Block name. */
				sprintf( __( 'Block type "%s" is already registered.' ), $name ),
				'5.0.0'
			);
			return false;
		}

		if ( ! $block_type ) {
			$block_type = new GC_Block_Type( $name, $args );
		}

		$this->registered_block_types[ $name ] = $block_type;

		return $block_type;
	}