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ebccd86338
Banners and collection prefetch no longer run back-to-back 2.5s waits. The home variant starts both under one server budget and reuses the dehydrated state so a slow banner cannot add a second document stall.
37 lines
1.4 KiB
TypeScript
37 lines
1.4 KiB
TypeScript
/**
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* How long a server render may wait for Marketplace data before giving up on
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* server-side rendering it.
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*
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* The catalog routes prefetch on the server so results land in the initial HTML
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* (crawlers, first paint). Awaiting that prefetch to completion makes the whole
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* RSC response hostage to the Marketplace API: with a slow upstream the browser
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* sits on the *previous* page with no feedback, which is what "search just spins
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* forever" looks like from the outside. Measured against a 3s-delayed API, an
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* unbounded await pushed time-to-first-byte to ~7s.
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*
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* Nothing is lost when the budget expires: the client re-requests whatever is
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* missing from the dehydrated state, and TanStack Query is configured to
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* dehydrate still-pending queries, so in-flight work streams instead of
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* blocking. Server rendering degrades exactly when it is too slow to be worth
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* waiting for.
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*
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* Homepage (`variant="home"`) overlaps banners and catalog prefetch under one
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* budget so a slow banner cannot add a second 2.5s onto the catalog wait.
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*/
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export const SERVER_PREFETCH_BUDGET_MS = 2_500
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export async function withinServerBudget(work: Promise<unknown>): Promise<void> {
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let cancelBudget = () => {}
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try {
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await Promise.race([
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work,
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new Promise<void>((resolve) => {
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const timer = setTimeout(resolve, SERVER_PREFETCH_BUDGET_MS)
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cancelBudget = () => clearTimeout(timer)
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}),
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])
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} finally {
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cancelBudget()
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}
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}
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