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jubnl
1ed00b67ad
H8: prefetched tiles and file blobs could be evicted under storage pressure (worsened by opaque tile responses inflating the quota ~7MB each), blanking the offline map right when a traveler needs it. Request persistent storage at app init so the browser exempts our caches from eviction. We deliberately keep tile requests no-cors (a cors switch would break self-hosted/custom tile providers without CORS headers), so persistence is the safe mitigation rather than de-opaquing responses. H9: Mapbox GL users had no offline map at all — no runtimeCaching matched the Mapbox hosts. Add a StaleWhileRevalidate rule for api.mapbox.com / *.tiles.mapbox.com so visited areas are available offline (best-effort; full pre-download still requires the Leaflet renderer, now documented). - new sync/persistentStorage.ts requestPersistentStorage(), called from main.tsx - vite.config: mapbox-tiles SW cache rule - MapViewAuto / tilePrefetcher comments document the offline-maps policy - tests for the persist helper (granted / already-persisted / absent / rejects)
19 lines
792 B
TypeScript
19 lines
792 B
TypeScript
/**
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* Ask the browser for persistent storage so our offline data — prefetched map
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* tiles, cached file blobs, the IndexedDB caches — is exempt from eviction under
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* storage pressure. Without this the browser may purge tiles right when a
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* traveler goes offline and needs them (audit H8 / M6).
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*
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* Best-effort and idempotent: returns whether persistence is (now) granted.
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*/
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export async function requestPersistentStorage(): Promise<boolean> {
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try {
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if (typeof navigator === 'undefined' || !navigator.storage?.persist) return false
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// Already persisted? Avoid re-prompting where the API distinguishes.
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if (navigator.storage.persisted && (await navigator.storage.persisted())) return true
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return await navigator.storage.persist()
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} catch {
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return false
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}
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}
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