@vaadin/hilla-file-router/runtime/configuration-builder/mergeSkipLayout.js

Hilla file-based router

import { transformTree } from "../../shared/transformTree.js";
import { getHandleFlag, RouteHandleFlag } from "./utils.js";
/**
* Processes a tree of route objects and splits them into two separate trees:
* - routes marked with {@link ViewConfiguration.skipLayout} flag that require
* no layout rendering,
* - regular routes that should render with their layouts.
*
* For routes with the {@link ViewConfiguration.skipLayout} flag, the layout
* element is removed. The resulting routes are also marked with
* {@link ViewConfiguration.ignoreFallback} flag to prevent rendering
* server-side layouts for them.
*
* @param originalRoutes - The current route tree to process.
*
* @returns A new array containing reorganized routes with skipped routes first
* (wrapped in an ignore-fallback container) followed by regular routes.
*/
export default function mergeSkipLayouts(originalRoutes) {
	if (!originalRoutes) {
		return originalRoutes;
	}
	const result = transformTree(originalRoutes, null, (routes, next) => routes.reduce((lists, route) => {
		if (getHandleFlag(route, RouteHandleFlag.SKIP_LAYOUTS)) {
			lists.skipped.push(route);
			return lists;
		}
		if (!route.children?.length) {
			lists.regular.push(route);
			return lists;
		}
		const { skipped, regular } = next(route.children ?? []);
		if (skipped.length > 0) {
			const { element,...rest } = route;
			lists.skipped.push({
				...rest,
				children: skipped
			});
		}
		if (regular.length > 0) {
			lists.regular.push({
				...route,
				children: regular
			});
		}
		return lists;
	}, {
		skipped: [],
		regular: []
	}));
	return [...result.skipped.length ? [{
		children: result.skipped,
		handle: { [RouteHandleFlag.IGNORE_FALLBACK]: true }
	}] : [], ...result.regular];
}
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