Source

File: wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php

protected function get_block( $name ) {
		$block_type = $this->block_registry->get_registered( $name );
		if ( empty( $block_type ) ) {
			return new WP_Error( 'rest_block_type_invalid', __( 'Invalid block type.' ), array( 'status' => 404 ) );
		}

		return $block_type;
	}