···11+export const strategyContent: Record<string, string> = {
22+ basic: `## No prefetching (baseline)
33+44+This is the baseline approach — no prefetching whatsoever. Every page navigation triggers a fresh network request, and the user sees loading skeletons while data is fetched on demand.
55+66+### How it works
77+88+1. The user navigates to the page
99+2. React Query fires the fetch request from the component
1010+3. A loading skeleton renders while the query resolves
1111+4. Data arrives and the table renders with results
1212+1313+### Trade-offs
1414+1515+- **Latency**: Every navigation incurs a full server round-trip
1616+- **UX**: Loading skeletons are visible on every page visit
1717+- **Simplicity**: The implementation is the easiest to understand and maintain
1818+1919+### When to use
2020+2121+This pattern works for low-traffic pages, internal tools, or anywhere the performance overhead of a round-trip is acceptable. It is the simplest possible starting point before adding any prefetching strategy.`,
2222+2323+ preloading: `## Route-level prefetch
2424+2525+Route-level prefetching improves perceived performance by initiating data fetches before the user reaches the page. When a link enters the viewport or receives focus, TanStack Router fires the route's \`loader\` function to pre-warm the query cache.
2626+2727+### How it works
2828+2929+1. TanStack Router detects that a link is about to be visited
3030+2. The route's \`loader\` calls \`prefetchQuery\` on the query client
3131+3. Data is fetched and cached in React Query's cache
3232+4. When the user clicks, the page renders instantly from cache
3333+3434+### Trade-offs
3535+3636+- **Bandwidth**: May fetch data the user never actually views
3737+- **Freshness**: Cached data needs an appropriate \`staleTime\`
3838+- **Complexity**: Requires defining loaders and query options per route
3939+4040+### Best practices
4141+4242+Set an appropriate \`staleTime\` to balance data freshness with cache hits. Use \`prefetchQuery\` for speculative fetches — it won't throw if the query fails, making it safe for preloading.`,
4343+4444+ "intent-preloading": `## Intent-based preloading
4545+4646+Intent preloading takes route-level prefetching further by triggering data fetches on hover and focus events. This creates a near-instant experience — data begins loading the moment the user shows intent to navigate.
4747+4848+### How it works
4949+5050+1. The user hovers over or focuses a navigation link
5151+2. The \`prefetch="intent"\` directive triggers the route's loader
5252+3. Data is fetched and cached before the click completes
5353+4. On click, the page renders immediately with zero loading time
5454+5555+### Why intent matters
5656+5757+Unlike viewport-based preloading which can trigger fetches for links the user may never click, intent preloading only fires when the user explicitly shows interest in a link. This balances performance gains with bandwidth efficiency.
5858+5959+### Configuration
6060+6161+Set \`prefetch="intent"\` on \`Link\` components or configure it as the default for specific routes in your router configuration.`,
6262+6363+ pagination: `## Viewport pagination preload
6464+6565+Pagination preloading uses the viewport to determine which pages to prefetch. When "next" or "previous" pagination links enter the viewport, the corresponding page's data is preloaded before the user clicks.
6666+6767+### How it works
6868+6969+1. Pagination links render with \`prefetch="viewport"\`
7070+2. When a link enters the viewport, the router triggers a prefetch
7171+3. Data is cached before the user clicks the navigation button
7272+4. Pagination navigation feels instant
7373+7474+### Why viewport preloading for pagination?
7575+7676+Pagination is a natural fit for viewport-based prefetching. The next and previous buttons are always visible at the bottom of the page, so prefetching them is almost guaranteed to be useful. It strikes an ideal balance between eager and lazy loading.
7777+7878+### Optimization
7979+8080+Combine with \`staleTime\` to avoid redundant refetches as the user pages back and forth through the data set.`,
8181+8282+ filters: `## Submitted filter prefetch
8383+8484+Filter-based prefetching improves search experiences by preloading results when a filter form is submitted. Instead of waiting for the filter to be applied after submission, data is already being fetched as the form processes.
8585+8686+### How it works
8787+8888+1. The user enters filter criteria in the form fields
8989+2. The form is submitted, updating search parameters in the URL
9090+3. React Query prefetches results for the new parameter set
9191+4. Results render with minimal loading time
9292+9393+### Key considerations
9494+9595+- **URL-driven state**: Filters are stored in search params, making them shareable and bookmarkable
9696+- **Cache management**: Each filter combination creates a unique cache entry with its own \`staleTime\`
9797+- **Type safety**: Valibot validates search params at the route boundary, ensuring the filter state is always valid`,
9898+9999+ "debounced-preload-filters": `## Debounced filter prefetch
100100+101101+Debounced preloading extends filter-based prefetching by initiating fetches on every keystroke — not just on form submission. A debounce window ensures the server is not overwhelmed by rapid-fire requests.
102102+103103+### How it works
104104+105105+1. The user types in the filter input
106106+2. Each keystroke updates the search params after a short debounce delay
107107+3. React Query fires a prefetch for the new parameter values
108108+4. Results update incrementally as the user types
109109+5. The user sees live-filtered results without needing to press submit
110110+111111+### Debounce strategy
112112+113113+The debounce delay balances responsiveness with server load. A 300–400ms window prevents unnecessary intermediate requests while still feeling snappy to the user. TanStack Pacer provides the debouncing primitive.
114114+115115+### When to use
116116+117117+Ideal for search-as-you-type interfaces against reasonably sized or indexed datasets. Pair with server-side indexing for larger collections.`,
118118+119119+ "live-query": `## Electric SQL synced collection
120120+121121+Live queries use Electric SQL to keep client-side data in sync with the server database in real time. Instead of polling or manual refetching, database changes are pushed to connected clients automatically.
122122+123123+### How it works
124124+125125+1. The client establishes a sync connection to the Electric SQL server
126126+2. A live query is defined using the TanStack DB collection API
127127+3. When database records change, updates stream to connected clients
128128+4. The UI re-renders automatically with fresh data
129129+130130+### Benefits
131131+132132+- **Real-time updates**: Changes appear immediately without manual refresh
133133+- **Offline support**: Local data remains available during connectivity interruptions
134134+- **Multi-user**: All connected clients see each other's changes in real time
135135+136136+### Trade-offs
137137+138138+Live queries require the Electric SQL sync infrastructure. They introduce additional complexity compared to simple REST fetching but are the right choice for collaborative or real-time applications where data freshness matters.`,
139139+140140+ "live-query-filters": `## Reactive filtered live search
141141+142142+Combining live queries with client-side filtering creates a real-time search experience. The full dataset stays in sync with the server while the client filters and displays results reactively as the user types.
143143+144144+### How it works
145145+146146+1. A live query fetches the full dataset and keeps it in sync
147147+2. Client-side filtering narrows results based on user input
148148+3. Results update immediately with every keystroke
149149+4. Underlying database changes are reflected in real time
150150+151151+### Architecture
152152+153153+Electric SQL handles the server-to-client sync layer, while TanStack DB collections manage live query subscriptions. Client-side filtering provides instant feedback without additional network requests, and URL search params keep the filter state shareable.
154154+155155+### Best for
156156+157157+Dashboards, monitoring interfaces, multi-user collaboration tools, and any application where data freshness takes priority over raw query throughput.`,
158158+};
···11+/*
22+ * src: github.com/JLarky/react-lazily/blob/main/src/core/lazily.ts
33+ *
44+ * MIT License
55+ * Copyright (c) 2020 JLarky
66+ *
77+ * Permission is hereby granted, free of charge, to any person obtaining a copy
88+ * of this software and associated documentation files (the "Software"), to deal
99+ * in the Software without restriction, including without limitation the rights
1010+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
1111+ * copies of the Software, and to permit persons to whom the Software is
1212+ * furnished to do so, subject to the following conditions:
1313+ *
1414+ * The above copyright notice and this permission notice shall be included in all
1515+ * copies or substantial portions of the Software.
1616+ *
1717+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
1818+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
1919+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
2020+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
2121+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
2222+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
2323+ SOFTWARE.
2424+ *
2525+ */
2626+2727+import { lazy } from "react";
2828+2929+export const lazily = <T extends {}, U extends keyof T>(loader: (x?: string) => Promise<T>) =>
3030+ new Proxy({} as unknown as T, {
3131+ get: (_target, componentName: string | symbol) => {
3232+ if (typeof componentName === "string") {
3333+ return lazy(() =>
3434+ loader(componentName).then((x) => ({
3535+ default: x[componentName as U] as any as React.ComponentType<any>,
3636+ })),
3737+ );
3838+ }
3939+ },
4040+ });
+84
src/server/pokemon.functions.ts
···11+import { createServerFn } from "@tanstack/react-start";
22+import * as v from "valibot";
33+import { DB } from "~/data/db";
44+import { POKEMON_LIMIT } from "~/constants";
55+66+const PokemonListParamsSchema = v.object({
77+ offset: v.optional(v.number()),
88+});
99+1010+const FilteredPokemonListParamsSchema = v.object({
1111+ offset: v.optional(v.number()),
1212+ nameFilter: v.optional(v.string()),
1313+});
1414+1515+const innerGetPokemonList = async (offset: number) => {
1616+ // Fetch one extra item to check if there are more results
1717+ const pokemon = await DB.queries.getPokemonAtOffset(offset, POKEMON_LIMIT + 1);
1818+1919+ // Check if there are more results by looking at the extra item
2020+ const hasMore = pokemon.length > POKEMON_LIMIT;
2121+2222+ // Remove the extra item if it exists
2323+ const results = hasMore ? pokemon.slice(0, -1) : pokemon;
2424+2525+ return {
2626+ pokemon: results,
2727+ nextOffset: hasMore ? offset + POKEMON_LIMIT : null,
2828+ prevOffset: offset > 0 ? Math.max(0, offset - POKEMON_LIMIT) : null,
2929+ };
3030+};
3131+3232+const innerGetFilteredPokemonList = async (offset: number, nameFilter: string) => {
3333+ // If no filter is provided, fall back to regular query
3434+ if (!nameFilter.trim()) {
3535+ return await innerGetPokemonList(offset);
3636+ }
3737+3838+ // Fetch one extra item to check if there are more results
3939+ const pokemon = await DB.queries.getFilteredPokemonAtOffset(
4040+ offset,
4141+ POKEMON_LIMIT + 1,
4242+ `%${nameFilter.trim()}%`,
4343+ );
4444+4545+ // Check if there are more results by looking at the extra item
4646+ const hasMore = pokemon.length > POKEMON_LIMIT;
4747+4848+ // Remove the extra item if it exists
4949+ const results = hasMore ? pokemon.slice(0, -1) : pokemon;
5050+5151+ return {
5252+ pokemon: results,
5353+ nextOffset: hasMore ? offset + POKEMON_LIMIT : null,
5454+ prevOffset: offset > 0 ? Math.max(0, offset - POKEMON_LIMIT) : null,
5555+ appliedFilter: nameFilter.trim(),
5656+ };
5757+};
5858+5959+export const getServerPokemonList = createServerFn({ method: "GET" })
6060+ .inputValidator((params) => {
6161+ const validated = v.parse(PokemonListParamsSchema, params);
6262+ const offset = validated.offset ?? 0;
6363+6464+ if (offset < 0) throw new Error("Offset must be greater than or equal to 0");
6565+6666+ return { offset };
6767+ })
6868+ .handler(async ({ data }) => {
6969+ return await innerGetPokemonList(data.offset);
7070+ });
7171+7272+export const getServerFilteredPokemonList = createServerFn({ method: "GET" })
7373+ .inputValidator((params) => {
7474+ const validated = v.parse(FilteredPokemonListParamsSchema, params);
7575+ const offset = validated.offset ?? 0;
7676+ const nameFilter = validated.nameFilter ?? "";
7777+7878+ if (offset < 0) throw new Error("Offset must be greater than or equal to 0");
7979+8080+ return { offset, nameFilter };
8181+ })
8282+ .handler(async ({ data }) => {
8383+ return await innerGetFilteredPokemonList(data.offset, data.nameFilter);
8484+ });