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Replies correlate\n * by `rid`, so a request does not need its own reply kind and two requests of\n * the same kind cannot be confused for one another.\n *\n * The URL is derived from `location`, never configured. That is what makes the\n * same build work on localhost, over a LAN address, and through a tunnel.\n */\n\nexport type Status =\n\t| \"connecting\"\n\t| \"connected\"\n\t| \"reconnecting\"\n\t| \"denied\"\n\t| \"deleted\"\n\t| \"closed\";\n\nexport type Unsubscribe = () => void;\n\ntype Frame = { kind: string; ts: number; rid?: string; sender?: string };\n\ntype Listener = (frame: never) => void;\n\ntype Pending = {\n\tresolve: (frame: never) => void;\n\treject: (error: Error) => void;\n};\n\nexport type WireOptions = {\n\tchannelId: string;\n\tonStatus?: (status: Status, reason?: string) => void;\n\tonAuthenticationRequired?: () => void;\n\tonDeleted?: () => void;\n};\n\ntype Refusal = { reason: string; authentication: boolean };\n\nconst BASE_DELAY = 500;\nconst MAX_DELAY = 15_000;\n\nfunction endpoint(options: WireOptions): string {\n\tlet url = new URL(\"/ws\", location.href);\n\turl.protocol = location.protocol === \"https:\" ? \"wss:\" : \"ws:\";\n\turl.searchParams.set(\"channel\", options.channelId);\n\treturn url.href;\n}\n\nfunction rid(): string {\n\treturn crypto.randomUUID().slice(0, 8);\n}\n\nexport class Wire {\n\t#options: WireOptions;\n\t#socket: WebSocket | undefined;\n\t#listeners = new Map>();\n\t#pending = new Map();\n\t#attempts = 0;\n\t#timer: ReturnType | undefined;\n\t/**\n\t * Undefined until the first transition, so the first one always announces.\n\t *\n\t * Started at `\"connecting\"` this would swallow its own opening state, and a\n\t * caller sharing one status across instances — React mounting, discarding\n\t * and remounting is exactly this — would keep displaying the dead\n\t * instance's last word until the new one happened to reach a different\n\t * state. A socket that never opens then reports the previous socket's\n\t * closure forever.\n\t */\n\t#status: Status | undefined;\n\t#everConnected = false;\n\t#disposed = false;\n\t#terminal = false;\n\t#connectionGeneration = 0;\n\n\tconstructor(options: WireOptions) {\n\t\tthis.#options = options;\n\t\tthis.#connect();\n\t}\n\n\tget status(): Status {\n\t\treturn this.#status ?? \"connecting\";\n\t}\n\n\t/**\n\t * Whether a request can be carried right now.\n\t *\n\t * Not the same as the reported status: `connected` is published from the\n\t * socket's open event, and a caller may be asking before that has run.\n\t * This reads the socket itself, which is what `ask` will do a moment later.\n\t */\n\tget connected(): boolean {\n\t\treturn this.#socket?.readyState === WebSocket.OPEN;\n\t}\n\n\treconnect(): void {\n\t\tif (this.#disposed || this.#terminal) return;\n\t\tclearTimeout(this.#timer);\n\t\tthis.#timer = undefined;\n\t\tlet previous = this.#socket;\n\t\tthis.#socket = undefined;\n\t\tthis.#abandon(\"connection restarted\");\n\t\tprevious?.close();\n\t\tthis.#connect();\n\t}\n\n\t#set(status: Status, reason?: string): void {\n\t\tif (this.#status === status) return;\n\t\tthis.#status = status;\n\t\tthis.#options.onStatus?.(status, reason);\n\t}\n\n\t#connect(): void {\n\t\tif (this.#disposed || this.#terminal) return;\n\t\tthis.#connectionGeneration++;\n\t\tthis.#set(this.#everConnected ? \"reconnecting\" : \"connecting\");\n\n\t\tlet socket = new WebSocket(endpoint(this.#options));\n\t\tthis.#socket = socket;\n\n\t\tsocket.addEventListener(\"open\", () => {\n\t\t\tif (this.#socket !== socket) return;\n\t\t\tthis.#everConnected = true;\n\t\t\tthis.#attempts = 0;\n\t\t\tthis.#set(\"connected\");\n\t\t});\n\n\t\tsocket.addEventListener(\"message\", event => {\n\t\t\tif (this.#socket !== socket) return;\n\t\t\tif (typeof event.data !== \"string\") return;\n\t\t\tthis.#receive(event.data);\n\t\t});\n\n\t\tsocket.addEventListener(\"close\", event => {\n\t\t\t// A socket superseded by a reconnect must not drive status or retries.\n\t\t\tif (this.#socket !== socket) return;\n\t\t\tthis.#socket = undefined;\n\t\t\tif (event.code === 4404) {\n\t\t\t\tthis.#deleted();\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tthis.#abandon(\"connection lost\");\n\t\t\tvoid this.#retry();\n\t\t});\n\t}\n\n\t/**\n\t * Work out why a connection attempt was refused.\n\t *\n\t * A browser cannot see the status of a failed upgrade — a rejected access\n\t * key and an unreachable server both surface as a bare close. The endpoint\n\t * answers an ordinary request with the reason, so ask it once rather than\n\t * retrying eight times against a door that will not open.\n\t */\n\tasync #refusal(): Promise {\n\t\ttry {\n\t\t\tlet response = await fetch(endpoint(this.#options).replace(/^ws/, \"http\"), {\n\t\t\t\theaders: { \"x-chopin-socket-probe\": \"1\" },\n\t\t\t});\n\t\t\tif (response.status >= 400 && response.status < 500) {\n\t\t\t\treturn {\n\t\t\t\t\treason: await response.text(),\n\t\t\t\t\tauthentication: response.status === 401,\n\t\t\t\t};\n\t\t\t}\n\t\t} catch {\n\t\t\t// Unreachable rather than refused; the retry loop is the right answer.\n\t\t}\n\t\treturn undefined;\n\t}\n\n\tasync #retry(): Promise {\n\t\tif (this.#disposed || this.#terminal) return;\n\t\tlet generation = this.#connectionGeneration;\n\n\t\tlet refusal = await this.#refusal();\n\t\tif (this.#disposed || this.#terminal || generation !== this.#connectionGeneration) return;\n\t\tif (refusal) {\n\t\t\tif (refusal.authentication) this.#options.onAuthenticationRequired?.();\n\t\t\treturn this.#set(\"denied\", refusal.reason);\n\t\t}\n\n\t\tlet delay = Math.min(BASE_DELAY * 2 ** this.#attempts, MAX_DELAY) * (0.5 + Math.random());\n\t\tthis.#attempts++;\n\t\tthis.#set(\"reconnecting\");\n\t\tthis.#timer = setTimeout(() => this.#connect(), delay);\n\t}\n\n\t#receive(raw: string): void {\n\t\tlet frame: Frame;\n\t\ttry {\n\t\t\tframe = JSON.parse(raw) as Frame;\n\t\t} catch {\n\t\t\treturn;\n\t\t}\n\n\t\tif (frame.rid) {\n\t\t\tlet waiting = this.#pending.get(frame.rid);\n\t\t\tif (waiting) {\n\t\t\t\tthis.#pending.delete(frame.rid);\n\t\t\t\tif (frame.kind === \"session:error\") {\n\t\t\t\t\twaiting.reject(new Error(String((frame as { message?: string }).message)));\n\t\t\t\t} else {\n\t\t\t\t\twaiting.resolve(frame as never);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t/*\n\t\t * One listener at a time.\n\t\t *\n\t\t * Frames are fanned out in a loop, so without this the first handler to\n\t\t * throw silences every handler registered after it for that kind — the\n\t\t * same failure Lexical's update listeners have, and just as quiet. A\n\t\t * broken sidecar must not stop the transcript from arriving.\n\t\t */\n\t\tfor (let listener of this.#listeners.get(frame.kind) ?? 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