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Request = Extract;\ntype Snapshot = { value?: unknown; error?: string; loading: boolean };\ntype Saved = { key: string; request: Request; value: unknown };\ntype Entry = {\n\tkey: string;\n\trequest: Request;\n\tsnapshot: Snapshot;\n\tchecked: number;\n\trunning?: Promise;\n\tlisteners: Set<() => void>;\n\tsubscribe: (listener: () => void) => () => void;\n\tread: () => Snapshot;\n};\n\nexport type Query = { value?: T; error?: string; loading: boolean; refresh: () => void };\n\nconst INTERVAL = 3 * 60 * 60 * 1000;\nconst EMPTY: Snapshot = { loading: true };\nconst cache = new Map();\nconst database = new Promise((resolve, reject) => {\n\tconst request = indexedDB.open(`ace:github:${host.url}`, 2);\n\trequest.addEventListener(\"upgradeneeded\", (event) => {\n\t\tif (event.oldVersion < 1) {\n\t\t\treturn request.result.createObjectStore(\"queries\", { keyPath: \"key\" });\n\t\t}\n\t\t// Version 1 also saved inline item details, which background refresh would keep requesting.\n\t\tconst cursor = request.transaction!.objectStore(\"queries\").openCursor();\n\t\tcursor.addEventListener(\"success\", () => {\n\t\t\tconst saved = cursor.result;\n\t\t\tif (!saved) return;\n\t\t\tif (![\"project-repo\", \"github-list\"].includes((saved.value as Saved).request.op)) {\n\t\t\t\tsaved.delete();\n\t\t\t}\n\t\t\tsaved.continue();\n\t\t});\n\t});\n\trequest.addEventListener(\"success\", () => {\n\t\trequest.result.addEventListener(\"versionchange\", () => request.result.close());\n\t\tresolve(request.result);\n\t});\n\trequest.addEventListener(\"error\", () => reject(request.error));\n}).catch(() => undefined);\n\n/** Storage failure leaves the shared memory cache usable. */\nasync function stored(\n\tmode: IDBTransactionMode,\n\toperation: (store: IDBObjectStore) => IDBRequest,\n): Promise {\n\ttry {\n\t\tconst db = await database;\n\t\tif (!db) return;\n\t\treturn await new Promise((resolve, reject) => {\n\t\t\tconst transaction = db.transaction(\"queries\", mode);\n\t\t\tconst request = operation(transaction.objectStore(\"queries\"));\n\t\t\ttransaction.addEventListener(\"complete\", () => resolve(request.result));\n\t\t\ttransaction.addEventListener(\"abort\", () => reject(transaction.error));\n\t\t\ttransaction.addEventListener(\"error\", () => reject(transaction.error));\n\t\t});\n\t} catch {\n\t\treturn undefined;\n\t}\n}\n\nfunction entry(request: Request): Entry {\n\tif (\"repo\" in request) request = { ...request, repo: request.repo.toLowerCase() };\n\tconst key = JSON.stringify(request, Object.keys(request).sort());\n\tconst existing = cache.get(key);\n\tif (existing) return existing;\n\tconst value: Entry = {\n\t\tkey,\n\t\trequest,\n\t\tsnapshot: EMPTY,\n\t\tchecked: 0,\n\t\tlisteners: new Set(),\n\t\tsubscribe(listener) {\n\t\t\tvalue.listeners.add(listener);\n\t\t\treturn () => void value.listeners.delete(listener);\n\t\t},\n\t\tread: () => value.snapshot,\n\t};\n\tcache.set(key, value);\n\treturn value;\n}\n\nfunction publish(value: Entry, snapshot: Snapshot) {\n\tvalue.snapshot = snapshot;\n\tfor (const listener of value.listeners) listener();\n}\n\nconst ready = stored(\"readonly\", (store) => store.getAll()).then((saved) => {\n\tfor (const value of saved || []) {\n\t\tpublish(entry(value.request), { value: value.value, loading: false });\n\t}\n});\n\nasync function load(value: Entry, force = false): Promise {\n\tawait ready;\n\tif (value.running) return value.running;\n\tif (host.status !== \"open\") return;\n\tif (!force && Date.now() - value.checked < INTERVAL) return;\n\tvalue.checked = Date.now();\n\tvalue.running = host.request(value.request).then(\n\t\t(result) => {\n\t\t\tpublish(value, { value: result, loading: false });\n\t\t\tvoid stored(\n\t\t\t\t\"readwrite\",\n\t\t\t\t(store) =>\n\t\t\t\t\tstore.put({ key: value.key, request: value.request, value: result } satisfies Saved),\n\t\t\t);\n\t\t},\n\t\t(error: Error) => {\n\t\t\tpublish(value, { ...value.snapshot, error: error.message, loading: false });\n\t\t},\n\t).finally(() => {\n\t\tvalue.running = undefined;\n\t});\n\tpublish(value, { ...value.snapshot, error: undefined, loading: true });\n\treturn value.running;\n}\n\nlet refreshing: Promise | undefined;\n\n/** Warm both pages without mounting them, and serialize background GitHub requests. */\nfunction refresh(force = false): Promise {\n\tif (refreshing) return refreshing;\n\trefreshing = (async () => {\n\t\tawait ready;\n\t\tfor (const value of cache.values()) {\n\t\t\tif (host.status !== \"open\") break;\n\t\t\tawait load(value, force);\n\t\t\tif (value.request.op !== \"project-repo\") continue;\n\t\t\tconst repo = value.snapshot.value as string | null | undefined;\n\t\t\tif (!repo) continue;\n\t\t\tfor (const kind of [\"issues\", \"prs\"] as const) {\n\t\t\t\tfor (const state of [\"open\", \"closed\", \"all\"] as const) {\n\t\t\t\t\tentry({ op: \"github-list\", repo, kind, state, search: \"\", limit: 50 });\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})().finally(() => {\n\t\trefreshing = undefined;\n\t});\n\treturn refreshing;\n}\n\nexport function useGithubRefresh(projects: AppProject[]) {\n\tconst source = JSON.stringify(projects.map(({ host, path }) => ({\n\t\top: \"project-repo\",\n\t\thost,\n\t\tproject: path,\n\t})));\n\tuseEffect(() => {\n\t\tfor (const request of JSON.parse(source) as Request[]) entry(request);\n\t\tvoid refresh();\n\t}, [source]);\n\tuseEffect(() => {\n\t\tconst connected = () => {\n\t\t\tfor (const value of cache.values()) {\n\t\t\t\tif (value.snapshot.error) value.checked = 0;\n\t\t\t}\n\t\t\tvoid refresh();\n\t\t};\n\t\tconst wake = () => {\n\t\t\tif (document.visibilityState === \"visible\") void refresh();\n\t\t};\n\t\tconst stop = onOpen(connected);\n\t\tconst timer = setInterval(() => void refresh(true), INTERVAL);\n\t\twindow.addEventListener(\"focus\", wake);\n\t\tdocument.addEventListener(\"visibilitychange\", wake);\n\t\tif (host.status === \"open\") connected();\n\t\treturn () => {\n\t\t\tstop();\n\t\t\tclearInterval(timer);\n\t\t\twindow.removeEventListener(\"focus\", wake);\n\t\t\tdocument.removeEventListener(\"visibilitychange\", wake);\n\t\t};\n\t}, []);\n}\n\nconst inactive = { subscribe: () => () => {}, read: () => EMPTY };\n\nexport function useGithub(request?: Request): Query {\n\tconst value = request ? entry(request) : undefined;\n\tconst store = value || inactive;\n\tconst snapshot = useSyncExternalStore(store.subscribe, store.read);\n\tconst status = useSyncExternalStore(host.subscribe, () => host.status);\n\tuseEffect(() => {\n\t\tif (value && status === \"open\") void load(value);\n\t}, [value, status]);\n\treturn {\n\t\tvalue: snapshot.value as T | undefined,\n\t\terror: !value ? undefined : status !== \"open\"\n\t\t\t? \"Connect to your host to refresh GitHub.\"\n\t\t\t: snapshot.error,\n\t\tloading: !!value && status === \"open\" && snapshot.loading,\n\t\trefresh: () => {\n\t\t\tif (value) void load(value, 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