private function block_templates( $slugs = array(), $post_type = '', $fs_only = false ) {

		// Get paths where to look for block templates.
		$block_templates_paths = $this->block_templates_paths();

		// Get all the slugs.
		$template_slugs = array_map( array( $this, 'generate_template_slug_from_path' ), $block_templates_paths );
		// If specific slugs are required, filter them only.
		$template_slugs = empty( array_filter( $slugs ) ) ? $template_slugs : array_intersect( $slugs, $template_slugs );

		if ( empty( $template_slugs ) ) {
			return array();
		}

		$templates = $fs_only
			?
			$this->block_templates_from_fs( $block_templates_paths, $template_slugs )
			:
			array_merge(
				$this->block_templates_from_db( $template_slugs ),
				$this->block_templates_from_fs( $block_templates_paths, $template_slugs )
			);

		// DB wins over fs, exclude not allowed post types.
		$templates = array_values(
			array_filter(
				$templates,
				function( $template, $key ) use ( $templates, $post_type ) {
					return ( ! ( $post_type && isset( $template->post_types ) && ! in_array( $post_type, $template->post_types, true ) ) ) &&
						array_search( $template->slug, array_unique( wp_list_pluck( $templates, 'slug' ) ), true ) === $key;
				},
				ARRAY_FILTER_USE_BOTH
			)
		);

		return $templates;

	}