@rpcbase/router

lazyRoute (replacement for loadRoute)

loadRoute has been removed. Use lazyRoute everywhere.

Migration (drop-in)

Before:

import { Route, loadRoute } from "@rpcbase/router"

const homePageRoute = loadRoute(import("@/pages/HomePage"))

<Route path="/" {...homePageRoute} />

After:

import { Route, lazyRoute } from "@rpcbase/router"

const homePageRoute = lazyRoute(() => import("@/pages/HomePage"))

<Route path="/" {...homePageRoute} />

Route module contract

A lazy route module should export:

• default: React component
• loader (optional): route loader

export default function HomePage() {
  return <h1>Home</h1>
}

export const loader = async ({ ctx }) => {
  return { user: ctx.req.session?.user ?? null }
}

Promise behavior (important)

Use a function that returns the import promise:

lazyRoute(() => import("@/pages/HomePage"))

Do not pass an already-started promise:

lazyRoute(import("@/pages/HomePage"))

Why:

• () => import(...) delays loading until route lazy resolution/prefetch.
• The importer is memoized, so concurrent lazy/load/prefetch calls share the same promise.

Optional prefetch data flag

Code prefetch can happen without data prefetch by default. If you want route data prefetch for a route, set prefetchData: true:

const reportsRoute = lazyRoute(() => import("@/pages/ReportsPage"), {
  prefetchData: true,
})

Query-driven overlays

Use useQueryOverlay to drive modal/drawer/sheet state from a query param.

import { useQueryOverlay } from "@rpcbase/router"

type SupportOverlay = "support" | "feedback"

const isSupportOverlay = (value: string | null): value is SupportOverlay =>
  value === "support" || value === "feedback"

function useSupportOverlay() {
  return useQueryOverlay<SupportOverlay>({
    param: "modal",
    parse: (value) => (isSupportOverlay(value) ? value : null),
  })
}

Returned API:

• value: parsed value from the query param (T | null)
• isOpen: true when value !== null
• buildHref(nextValue): builds next URL for links/prefetch
• openOverlay(nextValue): navigates with the query param set (replace: true)
• closeOverlay(): navigates with the query param removed (replace: true)

Shortcut prefetch + navigate

Use useShortcutPrefetchNavigate to prefetch on keydown and navigate on keyup. This avoids losing pending shortcut state across rerenders.

import { useRoutePrefetch, useShortcutPrefetchNavigate } from "@rpcbase/router"

function SupportShortcut({ getHref }: { getHref: () => string }) {
  const { prefetch } = useRoutePrefetch()

  useShortcutPrefetchNavigate({
    shortcut: { key: "k", mod: true },
    trigger: "keyup",
    getHref,
    prefetch,
  })

  return null
}

Default behavior:

• Ignores shortcuts while typing in input, textarea, select, or content editable
• Calls event.preventDefault()
• Resets pending keyup state on window blur
• Uses router navigation if navigate is not provided