first commit

platform_web/stores/navigation.ts

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+import type { PageId, PageParams } from "../contracts/page";
+import type { CurrentUserView } from "../contracts/workspace";
+import { canAccessRoute, defaultPageForUser, resolveRouteHash } from "../routes/routes";
+import { firstPartyRoutes } from "../routes/routes";
+
+const routeIds: PageId[] = firstPartyRoutes.map((route) => route.id);
+
+export function isPageId(value: string): value is PageId {
+  return routeIds.includes(value as PageId);
+}
+
+export interface NavigationState {
+  pageId: PageId;
+  params: PageParams;
+}
+
+export function initialNavigationState(user: CurrentUserView, hash = typeof window === "undefined" ? "" : window.location.hash): NavigationState {
+  const resolved = resolveRouteHash(hash, user);
+  if (!canAccessRoute(user, resolved.route.id)) {
+    return { pageId: defaultPageForUser(user), params: {} };
+  }
+  return { pageId: resolved.route.id, params: resolved.params };
+}